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Interação QTL por ambientes para produção de grãos e seus componentes em uma população de milho tropical; QTL by environment interaction for grain yield and its components in a tropical maize population

Barrios, Sanzio Carvalho Lima
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 06/12/2010 PT
Relevância na Pesquisa
66.36%
A interação QTL por ambientes (QE) têm sido relatada como uma das principais causas de insucesso da seleção assistida por marcadores moleculares (SAM). Estudos que visam o melhor entendimento da interação QE podem contribuir para o aumento da eficiência dos programas de SAM. O objetivo deste trabalho foi mapear QTL para produção de grãos (PG), prolificidade (PROL), peso de 500 grãos (P500), comprimento (CE) e diâmetro de espiga (DE), profundidade de grão (PROF), número de fileiras (NFil) e de grãos por fileira (NGFil) em uma população de milho tropical, verificar a importância da interação QE para estes caracteres e avaliar a estabilidade dos efeitos genéticos dos QTL mapeados. Uma população de 256 progênies F2:3 obtida do cruzamento entre duas linhagens de grupos heteróticos distintos e contrastantes para diversos caracteres foi avaliada em 13 ambientes. Os ambientes foram alocados em grupo de ambientes utilizando um método de agrupamento e o modelo AMMI, sendo que ambos os métodos levaram a identificação de três grupos de ambientes. O mapeamento de QTL foi realizado considerando um mapa genético com 177 marcadores microssatélites e mapeamento por intervalo composto expandido para múltiplos ambientes (mCIM). As médias de grupo de ambientes para cada caráter foram utilizadas nas análises. Foram mapeados 87 QTL...

Epistasia para a produção de grãos e seus componentes em milho; Epistasis for grain yield and yield components in maize

Garcia-Mendoza, Pedro José
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 01/12/2011 PT
Relevância na Pesquisa
66.45%
O conhecimento dos diferentes fatores genéticos que afetam os caracteres quantitativos de importância agronômica é um pré-requisito importante para o planejamento dos programas de melhoramento genético que visam explorar de maneira eficiente a variabilidade genética disponível nas populações. A importância da epistasia no melhoramento genético das populações de milho ainda não é bem entendida, sendo assim ignorada na maioria dos estudos de herança dos caracteres de interesses para os melhoristas. Os objetivos deste trabalho foram: (i) verificar a importância da epistasia para produção de grãos e seus componentes em milho; (ii) estimar os efeitos epistáticos em cada planta F2 para estes caracteres; e (iii) verificar a importância da interação epistasia x ambientes. A geração F1 obtida do cruzamento entre as linhagens endogâmicas L08-05F e L38-05D foi autofecundada para dar origem à população F2. Uma amostra de 100 plantas F2 foi autofecundada originando 100 progênies F2:3, que foram retrocruzadas com ambas as linhagens genitoras e sua geração F1, seguindo o esquema de cruzamento do delineamento triple test cross (TTC). As 300 progênies de retrocruzamentos foram avaliadas em 11 ambientes no município de Piracicaba/SP...

Mapeamento e congruência de QTL para teor de óleo, produção de grãos e seus componentes em milho; Mapping QTL and congruence for oil content, grain yield and its components in maize

Chaves, Luciana Gonçalves
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 14/08/2013 PT
Relevância na Pesquisa
66.45%
O principal desafio para o desenvolvimento de híbridos contendo alto teor de óleo é a correlação negativa entre este caráter e a produção de grãos. O conhecimento da herança do caráter teor de óleo e da produção de grãos e seus componentes conjuntamente podem auxiliar a condução de programas de melhoramento que visam ao desenvolvimento de genótipos produtivos e com alto teor de óleo. Assim, os objetivos desta pesquisa foram: estimar parâmetros genéticos; mapear QTL e a congruência destes para os caracteres teor de óleo (OL), produção de grãos (PG) e seus componentes. Duzentas e cinquenta e seis progênies F2:3 obtidas do cruzamento de duas linhagens endogâmicas contrastantes para teor de óleo foram avaliadas em experimentos com repetições. O mapeamento de QTL foi realizado considerando um mapa genético com 139 marcadores microssatélites e mapeamento por intervalo composto expandido para múltiplos ambientes (mCIM). As estimativas de variância genética de progênies e coeficientes de herdabilidade diferiram de zero para todos os caracteres. Os coeficientes de herdabilidade apresentaram magnitudes elevadas para todos os caracteres. A estimativa de variância progênies por ambientes foi significativa para PG e seus componentes. As correlações entre OL e os caracteres PG e seus componentes não foram significativas. Os caracteres prolificidade (PROL)...

Incremento na densidade de plantas : uma alternativa para aumentar o rendimento de grãos de milho em regiões de curta estação estival de crescimento; Increment on plant density: alternative to improve maize grain yield in short growing season regions

Almeida, Milton Luiz de; Merotto Junior, Aldo; Sangoi, Luis; Ender, Marcio; Guidolin, Altamir Frederico
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: application/pdf
POR
Relevância na Pesquisa
66.33%
O surgimento de novos cultivares de milho, de ciclo mais curto, estatura reduzida, menor número de folhas e folhas mais eretas aumentou o potencial de resposta da cultura à densidade de plantas. Essa tendência pode ser acentuada nos planaltos do Sul do Brasil, que apresentam temperatura média nos meses mais quentes inferiores a 22ºC, o que resulta em menor estação estival de crescimento. Quatro experimentos foram conduzidos objetivando avaliar a viabilidade de se trabalhar com densidade de plantas maiores do que as atualmente recomendadas para esta região, como uma forma de aumentar o rendimento de grãos. Nestes experimentos, submeteram-se os híbridos Cargill 901 e XL 370 a uma população que variou de 37.000 a 100.000pl ha-1, sob diferentes situações de manejo. Em três dos quatro experimentos realizados, o uso de densidade de plantas superior a 60.000plha-1 maximizou o rendimento de grãos. A maior competição intraespecífica verificada nas densidades mais elevadas não reduziu drasticamente o número de espigas por planta, o que contribuiu para a melhor adaptação da cultura a densidades elevadas. Dessa forma, para locais com estação estival de crescimento mais curta, o uso de cultivares precoces, de menor porte...

Seleção indireta em aveia para o incremento no rendimento de grãos; Indirect selection oat to improve grain yield

Caierão, Eduardo; Carvalho, Fernando Iraja Felix de; Pacheco, Marcelo Teixeira; Lonrecetti, Claudir; Marchioro, Volmir Sérgio; Silva, José Gonzales
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: application/pdf
POR
Relevância na Pesquisa
56.55%
Os diferentes caracteres de importância econômica para a cultura da aveia estão correlacionados entre si em magnitude e sentido variado. Tal fato implica que a seleção realizada sobre um caráter pode proporcionar alterações em outros, cujo resultado pode ou não ser de interesse. Assim, a quantificação dos efeitos diretos e indiretos da seleção de um ou vários caracteres sobre outros é de fundamental importância para orientar programas de melhoramento em que se tenham constituições genéticas que reúnam atributos favoráveis, constituindo-se no objetivo do trabalho. Foram avaliadas 58 linhagens de aveia, em Pelotas, em delineamento de blocos ao acaso com três repetições, sobre as quais foram realizadas avaliações fenotípicas, que foram utilizadas para a determinação dos coeficientes de correlação simples entre as variáveis. A partir desses coeficientes, aplicou-se o procedimento de análise de trilha sobre a variável rendimento de grãos. De acordo com os resultados obtidos, nenhuma variável analisada apresentou efeito direto sobre o rendimento de grãos semelhante ao coeficiente de correlação fenotípico total, demonstrando a existência de outras características influenciando, tanto na magnitude...

Water use and grain yield response of rainfed soybean to tillage-mulch practices in southeastern Nigeria

Obalum,Sunday Ewele; Igwe,Charles Arizechukwu; Obi,Martin Eze; Wakatsuki,Toshiyuki
Fonte: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz" Publicador: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2011 EN
Relevância na Pesquisa
66.36%
Despite the agronomic, economic and food values of soybean (Glycine max L. Merrill), there is still dearth of information on the tillage need and the implications of surface mulch for the crop in the eastern part of the forest-savanna transition zone of Nigeria. This study was therefore carried out on a sandy loam Ultisol at Nsukka with a sub-humid climate, during 2006 and 2007 cropping seasons. Our objective was to devise an appropriate tillage method for the crop from evaluated effects of no-till (NT), conventional tillage (CT) and mulch on selected key agronomic indices. Each of the NT and the CT was either unmulched (U) or mulched (M) in a split-plot, giving four treatments/tillage methods (NTU, NTM, CTU and CTM) randomized in four blocks. Rainfall was more favorable in the first than in the second season. The mean seasonal soil water storage (range, 99-109 mm) within 0.5-m soil layer differed among the treatments (NTU < CTU < NTM = CTM). However, for the first and second seasons, both water use (582-616 and 667-709 mm respectively) and grain yield (0.71-0.81 and 1.22-1.91 Mg ha-1 respectively) were not different. Mulch lowered the crop water use but had no influence on grain yield. Water use efficiency was enhanced with mulch only in the second season. Although either of the two mulch treatments (NTM/CTM) would be suitable for growing soybean especially in years of unfavorably distributed rainfall...

Selection for grain yield and quality in segregating generations of wheat

Andrade,Alessandro Ramos de; Riede,Carlos Roberto; Scholz,Maria Brígida dos Santos; Destro,Deonisio; Fonseca,Ines Cristina de Batista
Fonte: Instituto de Tecnologia do Paraná - Tecpar Publicador: Instituto de Tecnologia do Paraná - Tecpar
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2001 EN
Relevância na Pesquisa
66.42%
The objective of the work was to combine simultaneous selection for grain yield and technological quality in elite segregating populations of wheat developed by the breeding program of IAPAR. Thirteen populations were chosen according to their potentiality of genetic variability in the F2 generation of the 1997 crop season. One hundred heads were selected from each population and sown as F3 head-rows in the following season. Visual selection of individual head-rows or lines was done for yield potential and maturity. Seeds of the selected lines were evaluated for Sedimentation Values as well as Protein Content. The populations were identified as C1 to C13, representing the different crosses. The number of F2:3 lines selected within populations varied from one to 12. The populations C6, C7, C9, and C13 were classified as early maturity. Two populations (C6 and C9) presented higher potential for grain yield. The populations C12, C3, C8, and C1 were better for mean and variance of sedimentation values. The populations C2, C3 and C11 had a good performance for mean, maximum values and variance of protein content. The data indicates a good potential to obtain advanced lines with higher grain yield associated with a better technological quality.

Effect of seed size and protein content and N application timing on seedling vigor and grain yield of barley.

NEDEL, J.L.; ULLRICH, S.E.; PAN, W.L.
Fonte: Pesquisa Agropecuaria Brasileira, Brasilia, v.31, n.2, p.113-119, fev.1996. Publicador: Pesquisa Agropecuaria Brasileira, Brasilia, v.31, n.2, p.113-119, fev.1996.
Tipo: Artigo em periódico indexado (ALICE)
EN
Relevância na Pesquisa
66.24%
The objective of this study was to evaluate the effect of seed size, protein content and N application timing on barley seedling vigor and grain yield. Two seed sizes, three protein levels and two genotypes (Hazen and Hazen semi-dwarf, SD, isotype pair) were used in a laboratory and in a field study. In a greenhouse study with Hazen only, N application timing (at sowing and 20 days after emergence) treatments were added to the other treatments. High seed protein content and large seed positively affected coleoptile lenght, root dry weight and seedling dry weight at early stages of plant development, but had no effect on emergence rate index and plant and root dry weights at 40 days after emergence. Both the standard height and semi-dwarf isotypes responded similary.; 1996

Dry bean genotypes evaluation for growth, yield components and phosphorus use efficiency.

FAGERIA, N. K.; BALIGAR, V. C.; MOREIRA, A.; PORTES, T. A.
Fonte: Journal of Plant Nutrition, London, v. 33, n. 14, p. 2167-2181, 2010. Publicador: Journal of Plant Nutrition, London, v. 33, n. 14, p. 2167-2181, 2010.
Tipo: Artigo em periódico indexado (ALICE)
PT_BR
Relevância na Pesquisa
56.52%
Dry bean along with rice is a staple food for the population of South America. In this tropical region beans are grown on Oxisols and phosphorus (P) is one of the most yield limiting factors for dry bean production on these soils. A greenhouse experiment was conducted to evaluate P use efficiency in 20 elite dry bean genotypes grown at deficient (25 mg P kg?1 soil) and sufficient (200 mg P kg?1) levels of soil P. Grain yields and yield components were significantly increased with P fertilization and, interspecific genotype differences were observed for yield and yield components. The grain yield efficiency index (GYEI) was having highly significant quadratic association with grain yield. Based on GYEI most P use efficient genotypes were CNFP 8000, CNFP 10035, CNFP10104, CNFC 10410, CNFC 9461, CNFC 10467, CNFP 10109 and CNFP 10076 and most inefficient genotypes were CNFC 10438, CNFP 10120, CNFP 10103, and CNFC 10444. Shoot dry weight, number of pods per plant, 100-grain weights and number of seeds per pod was having significant positive association with grain yield. Hence, grain yield of dry bean can be improved with the improvement of these plant traits by adopting appropriate management practices. Soil pH, extractable P and calcium (Ca) saturation were significantly influenced by P treatments. Based on regression equation...

Capacidade combinat??ria e modifica????es de ambiente na express??o dos componentes do rendimento de gr??os e da qualidade industrial em trigo.; Combining ability and environment variation in the expression of the components of the grain yield and bread making quality in wheat.

SCHMIDT, Douglas Andr?? Mallmann
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Agronomia; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Agronomia; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
66.51%
In plant breeding programs, parental selection is a very important step. The selection of parents to be used to obtain the segregating populations can determine the success or failure in achieving genetic gains. Diallel analysis has been used to determine the general and specific combining ability and to aid the selection of the most promising combinations. The fitting of genotypes to environmental conditions that allow the expression of full genetic potential for the target characters, has shown great importance to maximize wheat grain yield and quality. In this sense, the main objective of the study was to determine the combining ability of wheat genotypes, and their performance for grain yield components and industrial quality traits in different environments under different nitrogen levels. Six parents were employed in diallel analysis, including reciprocal crosses, to evaluate general and specific combining ability of agronomic traits. The diallel cross experiments were conducted in Cap??o do Le??o County/RS in 2007 and the experiment evaluating nitrogen levels was conducted in environments of Cap??o do Le??o County in 2006 and 2007, and Iju?? County in 2007, both located in Rio Grande do Sul State. The nitrogen doses used were 0...

Genetic dissection of grain yield in bread wheat. I. QTL analysis

Kuchel, H.; Williams, K.; Langridge, P.; Eagles, H.; Jefferies, S.
Fonte: Springer Publicador: Springer
Tipo: Artigo de Revista Científica
Publicado em //2007 EN
Relevância na Pesquisa
66.64%
Grain yield forms one of the key economic drivers behind a successful wheat (Triticum aestivum L.) cropping enterprise and is consequently a major target for wheat breeding programmes. However, due to its complex nature, little is known regarding the genetic control of grain yield. A doubled-haploid population, comprising 182 individuals, produced from a cross between two cultivars ‘Trident’ and ‘Molineux’, was used to construct a linkage map based largely on microsatellite molecular makers. ‘Trident’ represents a lineage of wheat varieties from southern Australia that has achieved consistently high relative grain yield across a range of environments. In comparison, ‘Molineux’ would be rated as a variety with low to moderate grain yield. The doubled-haploid population was grown from 2002 to 2005 in replicated field experiments at a range of environments across the southern Australian wheat belt. In total, grain yield data were recorded for the population at 18 site-year combinations. Grain yield components were also measured at three of these environments. Many loci previously found to be involved in the control of plant height, rust resistance and ear-emergence were found to influence grain yield and grain yield components in this population. An additional nine QTL...

Evaluation of biofertilizers in irrigated rice: effects on grain yield at different fertilizer rates

Banayo, N.P.M.; Cruz, P.C.S.; Aguilar, E.A.; Badayos, R.B.; Haefele, S.M.
Fonte: MDPI Publicador: MDPI
Tipo: Artigo de Revista Científica
Publicado em //2012 EN
Relevância na Pesquisa
66.5%
Biofertilizers are becoming increasingly popular in many countries and for many crops, but very few studies on their effect on grain yield have been conducted in rice. Therefore, we evaluated three different biofertilizers (based on Azospirillum, Trichoderma, or unidentified rhizobacteria) in the Philippines during four cropping seasons between 2009 and 2011, using four different fertilizer rates (100% of the recommended rate [RR], 50% RR, 25% RR, and no fertilizer as Control). The experiments were conducted under fully irrigated conditions in a typical lowland rice environment. Significant yield increases due to biofertilizer use were observed in all experimental seasons with the exception of the 2008/09 DS. However, the effect on rice grain yield varied between biofertilizers, seasons, and fertilizer treatments. In relative terms, the seasonal yield increase across fertilizer treatments was between 5% and 18% for the best biofertilizer (Azospirillum-based), but went up to 24% in individual treatments. Absolute grain yield increases due to biofertilizer were usually below 0.5 t·ha−1, corresponding to an estimated additional N uptake of less than 7.5 kg N ha−1. The biofertilizer effect on yield did not significantly interact with the inorganic fertilizer rate used but the best effects on grain yield were achieved at low to medium fertilizer rates. Nevertheless...

Genotypic differences in grain yield and nitrogen uptake of lowland rice (Oryza sativa L.) under irrigated and rainfed conditions

Jabbar, S.M.A.; Cruz, P.C.S.; Siopongco, J.D.L.C.; Cosico, W.C.; Sanchez, P.B.; Amarante, S.T.; Haefele, S.M.
Fonte: Crop Science Society of the Philippines Publicador: Crop Science Society of the Philippines
Tipo: Artigo de Revista Científica
Publicado em //2009 EN
Relevância na Pesquisa
66.44%
A field experiment was conducted in the 2005 wet season at the International Rice Research Institute (IRRI), Los Baños, Laguna, Philippines, to assess the differences in grain yield (GY) and nitrogen-use efficiency (NUE) of selected rice (Oryza sativa L.) genotypes, and to determine plant parameters that contribute to the improvement of NUE under irrigated and rainfed lowland conditions. Six upland, five rainfed, and eight irrigated rice genotypes were tested under two nitrogen (N) treatments (0 and 75 kg N ha-1) and two water regimes (irrigated and rainfed lowland conditions). Significant differences among the genotypes were observed in GY, yield components, total aboveground plant N uptake (TNU), harvest index (HI), and NUE parameters. Irrigated conditions resulted in 52% higher grain yield and 51% higher TNU compared with rainfed conditions. The average yield gain due to N application was 540 kg ha-1 under irrigated conditions, and 484 kg ha-1 under rainfed conditions. The increase in GY was significantly correlated with TNU (R2=0.91). The study identified GY, TNU, NUE, and HI as important plant parameters to identify N-efficient genotypes. Under irrigated conditions, N-efficient genotypes were PSBRc9, IR72, IR57514-PMI-5-B-1, CT6510-24-1-2...

Correlations between grain-yield and percentage grain moisture at harvest in ontario hybrid corn trials

Mather, D.E.; Kannenberg, L.W.
Fonte: Agricultural Institute of Canada Publicador: Agricultural Institute of Canada
Tipo: Artigo de Revista Científica
Publicado em //1989 EN
Relevância na Pesquisa
66.35%
The correlation between hybrid corn (Zea mays L.) grain yield and percentage grain moisture at harvest was measured in Ontario performance trial data. Positive correlations were detected in mid- to full-season areas.; D. E. Mather and L. W. Kannenberg

Expression of the Arabidopsis vacuolar H⁺-pyrophosphatase gene (AVP1) improves the shoot biomass of transgenic barley and increases grain yield in a saline field; Expression of the Arabidopsis vacuolar H(+)-pyrophosphatase gene (AVP1) improves the shoot biomass of transgenic barley and increases grain yield in a saline field

Schilling, R.K.; Marschner, P.; Shavrukov, Y.; Berger, B.; Tester, M.; Roy, S.J.; Plett, D.C.
Fonte: Wiley Publicador: Wiley
Tipo: Artigo de Revista Científica
Publicado em //2014 EN
Relevância na Pesquisa
66.43%
Cereal varieties with improved salinity tolerance are needed to achieve profitable grain yields in saline soils. The expression of AVP1, an Arabidopsis gene encoding a vacuolar proton pumping pyrophosphatase (H⁺-PPase), has been shown to improve the salinity tolerance of transgenic plants in greenhouse conditions. However, the potential for this gene to improve the grain yield of cereal crops in a saline field has yet to be evaluated. Recent advances in high-throughput nondestructive phenotyping technologies also offer an opportunity to quantitatively evaluate the growth of transgenic plants under abiotic stress through time. In this study, the growth of transgenic barley expressing AVP1 was evaluated under saline conditions in a pot experiment using nondestructive plant imaging and in a saline field trial. Greenhouse-grown transgenic barley expressing AVP1 produced a larger shoot biomass compared to null segregants, as determined by an increase in projected shoot area, when grown in soil with 150 mM NaCl. This increase in shoot biomass of transgenic AVP1 barley occurred from an early growth stage and also in nonsaline conditions. In a saline field, the transgenic barley expressing AVP1 also showed an increase in shoot biomass and...

Water use and grain yield response of rainfed soybean to tillage-mulch practices in southeastern Nigeria

Obalum, Sunday Ewele; Igwe, Charles Arizechukwu; Obi, Martin Eze; Wakatsuki, Toshiyuki
Fonte: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz Publicador: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/10/2011 ENG
Relevância na Pesquisa
66.36%
Despite the agronomic, economic and food values of soybean (Glycine max L. Merrill), there is still dearth of information on the tillage need and the implications of surface mulch for the crop in the eastern part of the forest-savanna transition zone of Nigeria. This study was therefore carried out on a sandy loam Ultisol at Nsukka with a sub-humid climate, during 2006 and 2007 cropping seasons. Our objective was to devise an appropriate tillage method for the crop from evaluated effects of no-till (NT), conventional tillage (CT) and mulch on selected key agronomic indices. Each of the NT and the CT was either unmulched (U) or mulched (M) in a split-plot, giving four treatments/tillage methods (NTU, NTM, CTU and CTM) randomized in four blocks. Rainfall was more favorable in the first than in the second season. The mean seasonal soil water storage (range, 99-109 mm) within 0.5-m soil layer differed among the treatments (NTU < CTU < NTM = CTM). However, for the first and second seasons, both water use (582-616 and 667-709 mm respectively) and grain yield (0.71-0.81 and 1.22-1.91 Mg ha-1 respectively) were not different. Mulch lowered the crop water use but had no influence on grain yield. Water use efficiency was enhanced with mulch only in the second season. Although either of the two mulch treatments (NTM/CTM) would be suitable for growing soybean especially in years of unfavorably distributed rainfall...

GRAIN YIELD AND YIELD COMPONENTS BY SOYBEAN CANOPY STRATUM IN RESPONSE TO PLANT ARRANGEMENT AND WATER AVAILABILITY; RENDIMENTO DE GRÃOS DA SOJA E SEUS COMPONENTES POR ESTRATO DO DOSSEL EM FUNÇÃO DO ARRANJO DE PLANTAS E REGIME HÍDRICO

RAMBO, Lisandro; COSTA, José Antonio; PIRES, João Leonardo Fernandes; PARCIANELLO, Geovano; FERREIRA, Felipe Gutheil
Fonte: UFPR Publicador: UFPR
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 07/06/2005 ENG
Relevância na Pesquisa
56.56%
Plant arrangement that allow better plant distribuition in the area results in larger grain yield. This increase might be the result of diferential contribution of canopy strata for yield determination. The experiment was performed at Agronomic Experimental Estation of the Universidade Federal do Rio Grande do Sul, in Eldorado do Sul, Rio Grande do Sul, Brazil, in the 2000/01 growing season. The objectives were to evaluate grain yield and yield components by stratum of soybean canopy in different plant arrangements, under two water availability. Tested cultivar was BRS 137 (early, determinate), in no-till planting. Treatments arrangements were split-splitplot randomized complete-block design, with four replications. Water availability (irrigate and no irrigated), row spacing (20 and 40 cm) and population levels (20, 30 and 40 plants.m-2) were tested. Grain yield and yield components, by soybean canopy stratum, were determined in samples of ten plants, in sequence in the row, in each sub-subplot. Grain yield was incresead by irrigation and was detected interaction between row spacing and plant population. Plant arrangememnt of 20 cm row spacing and population of 20 plants.m-2 resulted in greater grain yield. There was a linear decrease in grain yield with the increase in population...

Biomass production and grain yield of three sorghum lines difering in drought resistance

Castro-Nava,S; Ortiz-Cereceres,J; Mendoza-Castillo,M del C; Huerta,AJ
Fonte: Phyton (Buenos Aires) Publicador: Phyton (Buenos Aires)
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2012 EN
Relevância na Pesquisa
66.44%
The aim of this study was to determine the eficiency of drought classification criteria that we previously reported for our grain sorghum genotypes. Two tolerant genotypes of grain sorghum [Sorghum bicolor (L.) Moench] (UAT-124 and UAT-152) and one susceptible (UAT-30) were subjected to drought under greenhouse conditions at either panicle initiation, flag leaf, or flowering. Results showed that the effects of drought depended on when drought stress occurred during development. Biomass of the three sorghum genotypes was significantly reduced at the flag leaf stage (48%) by drought stress, but the greatest reduction occurred in the susceptible genotype UAT-30 (71%). Results showed that biomass accumulation for UAT-124 and UAT-30 was strongly in accordance with our previous drought classification, but this was not true for UAT-152. Drought stress reduced grain yield significantly in all genotypes, when it was applied at fag leaf stage (24%) and at flowering (28%), but not at panicle initiation. Resistant and susceptible genotypes had the same response in terms of grain yield when stress was applied at any of the three phenological stages. The results indicate that genotype responses to drought treatment were inconsistent with their initial classification. The identification of tolerant and susceptible sorghum genotypes could be better accomplished by applying drought stress at the more susceptible stage of development...

Analysis of grain density and yield characters in aromatic rice genotypes

Shahidullah,S. M.; Hanafi,M. M.; Ashrafuzzaman,M.; Uddin,M. K.; Razi-Ismail,M.
Fonte: Colegio de Postgraduados Publicador: Colegio de Postgraduados
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/05/2010 EN
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Aromatic rices (Oryza sativa L.) normally produce enormous spikelets of low grain weight resulting low yield. Grain weight and grain density are the vital indicators of grain filling and mainly dependent on genetic make-up. Detail study of grain density and yield components of aromatic rice is a crucial need for yield improvement. An experiment was conducted with 40 rice genotypes to assess the grain density of aromatic rices and to observe the relationships of different grain categories with yield characters. The percentage of high density grains, good grains, average grains, poor grains, partially filled grains, spikelet sterility, and thousand grain weight were found to vary in a great extent. Maximum 50 % high density grain was harvested in BR39 and a minimum 1 % in Khazar. Thousand grain weight ranged from 10 g to 30 g. The proportion of high density grains was positively correlated with thousand grain weight (r =0.57) and grain yield (r =0.57). The negative relations were found between spikelet sterility and grain yield (r = -0.47) and also between number of grains and thousand grain weight (r = -0.74). The grain yield showed the highest positive direct relation (0.23) with thousand grain weight, followed by high density grains (0.20).

Grain yield and yield components of triticale upon application of different foliar fertilizers

Kinaci,Engin; Gulmezoglu,Nurdilek
Fonte: ASOCIACIÓN INTERCIENCIA Publicador: ASOCIACIÓN INTERCIENCIA
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2007 EN
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Field experiments were conducted in the growing seasons of 2000-2001 and 2001-2002 to investigate the effects of various commercial foliar fertilizers containing N, P, K and micro nutrients on yield and yield components of triticale. Yield and yield component values were different among years because of dry season. The results revealed that foliar treatments had significant positive effect on grain yield, spikelet number per spike, number of grain per spike, 1000 grain weight and harvest index in both years. The most effective foliar fertilizer on yield and yield components during drought stress was Zn-15, a chelated (EDTA) form of zinc. Both NZN and ZnSO4 increased grain yield of triticale under no stress conditions.