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Desempenho da cultura de milho (Zea mays L.) submetida a aplicação de herbicidas pós-emergentes, em diferentes situações de manejo.; Performance of the corn crop (Zea mays L.) submitted to application of post-emergence herbicides, in different management situations.

Nicolai, Marcelo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 19/01/2005 PT
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A aplicação de herbicidas pós-emergentes na cultura de milho é intensa, expondo a cultura às inumeras situações de manejo em coincidência com a utilização destes agroquímicos, podendo resultar em interações prejudiciais a cultura. Sendo assim, desenvolveu-se esta pesquisa, com o objetivo de avaliar a possibilidade de interação entre esses herbicidas com inseticidas e adubos nitrogenados, bem como a eficácia dos herbicidas no controle de plantas daninhas. Foram instalados experimentos a campo e em casa-de-vegetação, nas dependências do Departamento de Produção Vegetal da ESALQ-USP. Foram três modalidades de experimentação, onde foi utilizado o delineamento estatístico de blocos casualizados com quatro repetições. O primeiro experimento avaliou a interação entre os herbicidas pós-emergentes, mesotrione, nicosulfuron e iodosulfuron + foramsulfuron, e as fontes nitrogenadas, sulfato de amônia em cobertura e uréia incorporada. Após a analise dos resultados, foram observados alguns sintomas fitotóxicos causados pelos herbicidas. Tais sintomas evoluíram até o total desaparecimento, tornando-se imperceptíveis ao longo do ciclo da cultura, a qual apresentou altura de pendoamento semelhante a testemunha. Os rendimentos de grãos e o peso de mil grãos não indicam reduções de produtividade. Tanto para a uréia...

Use of crop canopy sensors in the measurement of sugarcane parameters aiming site-specific nitrogen fertilization management; Uso de sensores de dossel na mensuração de parâmetros em cana-de-açucar visando ao gerenciamento localizado da adubação nitrogenada

Portz, Gustavo
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 09/06/2015 EN
Relevância na Pesquisa
36.74%
Plant canopy sensors have emerged as a new tool for in field on-the-go spatially localized prediction of plant biomass and nitrogen (N) uptake by crops in an indirectly and plant indestructible way as base for N variable rate fertilization. Sensors based on the combination of specific reflectance bands from the electromagnetic spectrum constitute the vast majority of canopy sensors, and this principle has already been validated in many crops. Alternatively to this concept, the use of ultrasonic distance sensors to measure crop canopy height has been presented as an option to estimate biomass. Based on that, the aim of this thesis was to validate and refine canopy sensor systems on automated diagnosis of plant parameters aimed the application of N fertilizer according sugarcane needs. Therefore, it was necessary to: 1) validate the prior calibration made for the reflectance sensor (Portz et al., 2012) and to establish the best time to use the sensor over the crop; 2) test the use of the reflectance sensor in comparative strips trials of uniform and sensor based N variable rate application testing algorithms with positive and negative slope and measuring productivity at the end of the season; 3) obtain the relationship between crop canopy height with accumulated biomass and N uptake by the crop during the initial growing season; 4) explore the plant height measured with an ultrasonic sensor comparing the results of biomass and N uptake prediction with those obtained with the reflectance sensor. The experiments were conducted on commercial sugarcane fields...

The primary sources of carbon loss during the crop-establishment period in a subtropical Oxisol under contrasting tillage systems

Pes, Luciano Z.; Amado, Telmo J. C.; La Scala, Newton; Bayer, Cimelio; Fiorin, Jackson E.
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 163-171
ENG
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); The physical protection of mineralizable carbon (C) in aggregates has been identified as the primary mechanism of soil C stabilization. Therefore, it is possible to hypothesize that the disruption of aggregate by soil tillage is a key process driving C losses during the crop-establishment period. However, these findings are based on studies performed in temperate soils. Limited information is available for studies performed in subtropical and tropical soils, especially in Oxisols, which are rich in oxides that provides chemical C stabilization. This study was performed in southern Brazil in a long-term soil-management experiment carried out in a clay Typic Haplorthox in Cruz Alta (RS). During the 22nd year of the experiment, carbon dioxide (CO2-C) emissions, temperature, and soil moisture were intensively evaluated over a 21-day summer crop-establishment period using a closed infrared CO2-flux chamber. The cropping system investigated was an intensive crop rotation following the soil input of winter-cover crops (black oat (Avena strigosa Schreb) + common vetch (Vicia sativa L) under two contrasting tillage systems...

Use of crop canopy cover to estimate lettuce Etc in a greenhouse

Shahidian, Shakib; Serrano, João; Vieira, Fabiana; Coelho, Renato
Fonte: Proceedings of the International Conference of Agricultural Engineering (AgEng2014) Publicador: Proceedings of the International Conference of Agricultural Engineering (AgEng2014)
Tipo: Aula
ENG
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FAO PM Reference evapotranspiration, as described by Allen et al. (1998) is used extensively to calculate crop water needs, in the form of Crop evapotranspiration, ETc. The main challenge to its everyday use is the estimation of the correct crop coefficient (Kc). Although this can be done using crop growth stages, the farmer is left with a lot of guesswork. The objective of this work was to estimate the possibility of using canopy cover (Cc) measured by a standard camera to establish the Kc values of lettuce crop grown in a greenhouse. In a greenhouse in southern Europe, 0.3m diameter weighing mini-lysimeter were planted with lettuce. The Kc was calculated as a ratio of daily crop water use from the lysimeter and grass reference evapotranspiration (ETo). Canopy cover ratio (%Cc) was determined using the area of green in the lysimeter that was visible in the images. The results were plotted as a relation between Kc and Cc and an exponential approximation was made.The results were very positive showing a significant correlation between the calculated Kc and %Cc in the mini-lysimeters. The methodology proved to be highly effective in the early stages of the crop development, until the crop completely covers the soil. After that, the %Cc continued to increase until harvest...

Crop loading studies on ‘Caricia’ and ‘Eva’ apples grown in a mild winter area

Castro,Damián César; Álvarez,Norma; Gabriel,Paola; Micheloud,Norma; Buyatti,Marcela; Gariglio,Norberto
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 01/06/2015 EN
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The crop load level of an apple (Malus × domestica Borkh.) tree impacts fruit yield and quality parameters, tree vigor and biennial bearing. The optimal crop load is that which allows for consistent annual cropping and fruit quality acceptable to the market. We evaluated the effect of crop load on yield and fruit quality of two low-chill apples cv. ‘Caricia’ and ‘Eva’, growing in a mild winter area. During 2010 and 2011 crop load was manually adjusted from 2 or 3 to 17 fruits cm−2 of trunk cross-sectional area (TCSA). Fruit yield was positively related to crop load in both cultivars but mean fruit weight diminished as the crop load increased. For both cultivars, the production of non-commercial and small-sized fruit increased, whereas production of middle-sized fruit diminished as the fruit load increased. Shoot length was not affected by crop load in ‘Eva’ whereas it was reduced in ‘Caricia’. Red skin color (RSC %) had a quadratic response to crop load in ‘Caricia’. On the other hand, the RSC % of ‘Eva’ fruit was adjusted to a negative logarithmic model as an effect of crop load increment. No biennial bearing was observed in either cultivar. This research study suggests that the maximum limit of crop load for both cultivars is 7 fruits cm−2 of TCSA...

Crop Production and Road Connectivity in Sub-Saharan Africa : A Spatial Analysis

Dorosh, Paul; Wang, Hyoung-Gun; You, Liang; Schmidt, Emily
Fonte: Banco Mundial Publicador: Banco Mundial
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This study examines the relationship between transport infrastructure and agriculture in Sub-Saharan Africa using new data obtained from geographic information systems (GIS). First, the authors analyze the impact of road connectivity on crop production and choice of technology. Second, they explore the impact of investments that reduce road travel times. Finally, they show how this type of analysis can be used to compare cost-benefit ratios for alternative road investments in terms of agricultural output per dollar invested. The authors find that agricultural production is highly correlated with proximity (as measured by travel time) to urban markets. Likewise, adoption of high-productive/high-input technology is negatively correlated with travel time to urban centers. There is therefore substantial scope for increasing agricultural production in Sub-Saharan Africa, particularly in more remote areas. Total crop production relative to potential production is 45 percent for areas within four hours travel time from a city of 100...

Potential Impact of Climate Change on Resilience and Livelihoods in Mixed Crop-Livestock Systems in East Africa

Herrero, Mario; Jones, Peter G; Karanja, Stanley; Mutie, Ianetta; Rufino, Mariana C; Thornton, Philip K
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
EN_US
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Climate-induced livelihood transitions in the agricultural systems of Africa are increasingly likely. A recent study by Jones and Thornton (2009) points to the possibility of such climate-induced livelihood transitions in the mixed crop-livestock rainfed arid-semiarid systems of Africa. These mixed systems cover over one million square kilometers of farmland in West Africa, Eastern Africa, and Southeastern Africa. Their characteristically scant rainfall usually causes crop failure in one out of every six growing seasons and is thus already marginal for crop production. Under many projected climate futures, these systems will become drier and even more marginal for crop production. This will greatly increase the risk of cropping and among the several possible coping and adaptation mechanisms, (e.g. totally abandoning farming, diversification of income-generating activities such as migration and off-farm employment, etc.) agro-pastoralists may alter the relative emphasis that they currently place on the crop and livestock components of the farming system in favor of livestock. There has been only limited analysis on what such climate induced transitions might look like...

Crop Choice and Infrastructure Accessibility in Tanzania

Iimi, Atsushi; Humphreys, Richard Martin; Melibaeva, Sevara
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Trabalho em Andamento
EN_US
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Africa has great potential for agriculture. Although international commodity prices have been buoyant, Africa’s supply response seems to be weak. A variety of constraints may exist. Using the case of Tanzania, the paper examines the impact of market connectivity, domestic and international, on farmers’ crop choices. It is shown that the international market connectivity, measured by transport costs to the maritime port, is important for farmers to choose export crops, such as cotton and tobacco. Internal connectivity to the domestic market is also found to be important for growing food crops, such as maize and rice. Among other inputs, access to irrigation and improved seed availability are also important factors in the crop choices of farmers. The size of land area is one constraint to promote the crop shift. The paper also reports the finding that farmers are not using market prices effectively in their choice of crop, even after the endogeneity of local prices is taken into account.

Calf crop

United States -- Crop Reporting Board
Fonte: U.S. Dept. of Agriculture, Statistical Reporting Service, Crop Reporting Board; U.S. Dept. of Agriculture, Statistical Reporting Service, Crop Reporting Board ( Washington, D.C ) Publicador: U.S. Dept. of Agriculture, Statistical Reporting Service, Crop Reporting Board; U.S. Dept. of Agriculture, Statistical Reporting Service, Crop Reporting Board ( Washington, D.C )
Tipo: Artigo de Revista Científica Formato: v. : ; 27 cm.
Publicado em // ENGLISH
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(Numbering Peculiarities) Initial report for each year published in July, updated in Feb.; e.g. initial report for 1968 issued July 24, 1968, upated with Feb. 20, 1969 release.; "Statistical Reporting Service, MtAn 2-2."; (Statement of Responsibility) U.S. Department of Agriculture, Statistical Reporting Service, Crop Reporting Board.

Calf crop

United States -- Crop Reporting Board
Fonte: U.S. Dept. of Agriculture, Statistical Reporting Service, Crop Reporting Board; U.S. Dept. of Agriculture, Statistical Reporting Service, Crop Reporting Board ( Washington, D.C ) Publicador: U.S. Dept. of Agriculture, Statistical Reporting Service, Crop Reporting Board; U.S. Dept. of Agriculture, Statistical Reporting Service, Crop Reporting Board ( Washington, D.C )
Tipo: Artigo de Revista Científica Formato: v. : ; 27 cm.
Publicado em // ENGLISH
Relevância na Pesquisa
46.56%
(Numbering Peculiarities) Initial report for each year published in July, updated in Feb.; e.g. initial report for 1968 issued July 24, 1968, upated with Feb. 20, 1969 release.; "Statistical Reporting Service, MtAn 2-2."; (Statement of Responsibility) U.S. Department of Agriculture, Statistical Reporting Service, Crop Reporting Board.

Calf crop

United States -- Crop Reporting Board
Fonte: U.S. Dept. of Agriculture, Statistical Reporting Service, Crop Reporting Board; U.S. Dept. of Agriculture, Statistical Reporting Service, Crop Reporting Board ( Washington, D.C ) Publicador: U.S. Dept. of Agriculture, Statistical Reporting Service, Crop Reporting Board; U.S. Dept. of Agriculture, Statistical Reporting Service, Crop Reporting Board ( Washington, D.C )
Tipo: Artigo de Revista Científica Formato: v. : ; 27 cm.
Publicado em // ENGLISH
Relevância na Pesquisa
46.56%
(Numbering Peculiarities) Initial report for each year published in July, updated in Feb.; e.g. initial report for 1968 issued July 24, 1968, upated with Feb. 20, 1969 release.; "Statistical Reporting Service, MtAn 2-2."; (Statement of Responsibility) U.S. Department of Agriculture, Statistical Reporting Service, Crop Reporting Board.

Effect of crop residue qualities on decomposition rates, soil phosphorus dynamics and plant phosphorus uptake.

Iqbal, Shahriar Mohammod
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2009
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Phosphorus (P) is an essential plant nutrient that may limit plant growth and agricultural productivity if not available for crop plant uptake in sufficient quantities at the time required. Many Australian soils are deficient in available P, despite a long history of P fertilizer application, and this is due to fertilizer P rapidly becoming unavailable largely through biochemical fixation. The resulting low P fertilizer efficiency, coupled with rapidly rising cost of fertilizers, has increased interest in biological cycling of P from sources such as crop residues. However, to date, much of the Australian research has focussed on soils with relatively high organic matter content (> 2%) and relatively heavy texture i.e. medium to high clay content. Furthermore, although there is information on pasture residue decomposition and P release for sandy soils with low organic matter in Australia, a recent shift to continuous cropping systems means that information for a range of crop residues is required but is not currently available. Therefore the aims of the work described in this thesis were to (i) increase the efficiency of P use when crop residue P are applied to crops and (ii) determine the effect of crop residue biochemical quality on decomposition rates...

The effect of crop load and extended ripening on wine quality and vine balance in Vitis vinifera cv. cabernet sauvignon.

McDonnell, Carrie
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2011
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Crop load reduction and extended ripening are two practices commonly required for wine grape growers with intention to improve wine quality; however, both cause significant yield loss. Studies on crop load have been conflicting and limited studies exist on extended ripening—warranting further research. The aim of this study was to investigate the interaction of crop load and extended ripening on yield components, wine and fruit composition and to increase understanding of the synchronization of flavor ripeness with sugar ripeness through optimal vine balance. In 2005, 2006 and 2007 a commercial vineyard of clone 8 Cabernet Sauvignon located in Paso Robles, CA was adjusted to four crop levels post fruit set. Each crop level was harvested at five target °Brix levels from 22.5-28.5 °Brix and fermented into wine. Yield components, growth, wine and fruit composition, and wine sensory were measured and assessed on all replicated treatments. A second experiment was conducted in 2006-2007 to investigate the effects of crop load and late season irrigation on extended ripening. Grapevines exhibited self regulation in growth and yield component compensation. Yield components were reduced from both crop thinning and extended ripening. Pruning weight per vine increased in treatments thinned to lower crop loads in all three seasons...

Epi-fingerprinting and epi-interventions for improved crop production and food quality

Rodriguez Lopez, C.M.; Wilkinson, M.J.
Fonte: Frontiers Media Publicador: Frontiers Media
Tipo: Artigo de Revista Científica
Publicado em //2015 EN
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Increasing crop production at a time of rapid climate change represents the greatest challenge facing modern agricultural research. Much of our understanding of the genetic control of yield derives from controlled field experiments that seek to minimise variance in the growing environment. However, there is inevitably substantial residual variability among plants in their phenotype, development and yield attributable to Genotype x Environment (GxE) interactions. Recent advances in the field of epigenetics have revealed a plethora of gene control mechanisms that could account for much of this unassigned variation. These systems act as a regulatory interface between the perception of environmental variables and associated alterations in gene expression and provide exciting new opportunities for crop improvement. Direct manipulation of epigenetic control systems hold the enticing promise of creating new sources of variability that could enhance crop performance. Equally, understanding the relationship between various epigenetic states and responses of the crop to specific aspects of the growing environment (epigenetic fingerprinting) could allow for a more tailored approach to plant agronomy. In this review, we explore the many ways in which epigenetic interventions and epigenetic fingerprinting can be deployed for the improvement of crop production and quality.; Carlos M. Rodríguez López...

Enhancing Crop Insurance in India

World Bank
Fonte: World Bank Publicador: World Bank
Tipo: Economic & Sector Work :: Other Agricultural Study
ENGLISH
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The broad structure of Modified National Agricultural Insurance Scheme (mNAIS), the main crop insurance program in India, is technically sound and appropriate in the context of India. The NAIS is based on an indexed approach, where average crop yield of an insurance unit, or IU, (i.e., block) is the index used. The insurance is mandatory for all farmers that borrow from financial institutions, though insurance cover is also available to non-borrowers. The actual yield of the insured crop (as measured by crop cutting experiments) in the IU is compared to the threshold yield. If the former is lower than the latter, all insured farmers in the IU are eligible for the same rate of indemnity payout. Individual crop insurance will have been prohibitively expensive, or even impossible, in a country such as India with so many small and marginal farms. Further, the method of using an 'area based approach' has several other merits and, most importantly, it mitigates moral hazard and adverse selection. This report offers detailed analysis of a number of technical and operational issues which should be addressed if mNAIS is to be implemented. GOI is to be complemented on its bold vision of the future of agriculture insurance through modifying NAIS...

India - Crop Insurance Non-Lending Technical Assistance : Summary of Policy Suggestions

World Bank
Fonte: World Bank Publicador: World Bank
Tipo: Economic & Sector Work :: Other Agricultural Study
ENGLISH
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At the request of Government of India (GOI), the World Bank has provided technical assistance to the public insurance company, Agriculture Insurance Company of India (AICI) to develop an actuarially sound rating methodology and improve the contract design of the area-yield based National Agriculture Insurance Scheme (NAIS) to reduce delays in claim settlement; to design and ratemaking of new weather index insurance products under the weather based crop insurance scheme; and to perform a risk assessment of AICI's insurance portfolio and to suggest cost-effective risk financing solutions (including reinsurance). Crop insurance can contribute to increasing access to rural finance and is required to ensure a more viable agriculture credit business. An improved crop insurance program supports and complements other critical agriculture sector related measures, including the reform of rural credit cooperatives, agriculture marketing reforms and efforts to improve agriculture extension and productivity. A better understanding of risks entailed in particular crops in particular areas which can be ascertained through assessing the actuarially sound insurance premium rates for the crop can also be a significant input to agriculture policy at sub-national and national levels. Similarly...

Crop Insurance in Karnataka

Kalavakonda, Vijay; Mahul, Olivier
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Publications & Research :: Policy Research Working Paper; Publications & Research
ENGLISH
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The authors examine the performance of the crop insurance scheme in Karnataka, a southern state of India and the second driest state in the country. Their analysis highlights weaknesses in product design, implementation challenges, and operational problems. The authors' finding is that the crop insurance scheme in its current form does not achieve its objectives, either explicit (risk management) or implicit (safety net and containment of both the central and state governments' contingent liability). The crop insurance scheme performs poorly both in terms of coverage (number of hectares insured and number of farmers purchasing insurance) and financial performance. The authors provide a framework for designing a crop insurance scheme based on the premise that insurance is a cost effective risk management techniques. They also provide some new ideas and thinking toward both improving the existing crop insurance scheme and exploring alternatives to the current product, based on an area-yield approach.

Avaliações microclimáticas, fenológicas e agronômicas em café arábica cultivado a pleno sol e consorciado com banana 'Prata Anã'.; Microclimatic, phenological and agronomic evaluations in coffee crop grown under unshaded and shaded by ‘Prata An㒠banana plants conditions.

Pezzopane, José Ricardo Macedo
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 21/01/2005 PT
Relevância na Pesquisa
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O presente trabalho foi realizado em cafeeiros (Coffea arabica L.) cv. Icatu Vermelho IAC 4045, cultivados a pleno sol e consorciados com banana ‘Prata An㒠(Musa AAB), em Mococa – SP (Latitude 21º 28’ S, Longitude 47º 01’ W, altitude 665m). Foi realizada a caracterização microclimática, entre outubro de 2001 e setembro de 2002, onde foram medidos a radiação solar global, saldo de radiação, velocidade do vento e temperatura e umidade relativa do ar nos dois sistemas de cultivo. No período do inverno de 2002 e 2003, foi realizado um estudo da influência das bananeiras na variabilidade espacial da temperatura do ar e folha, além do saldo de radiação, em episódios de resfriamento noturno. Realizou-se também uma caracterização aerodinâmica e energética dos cultivos, entre dezembro de 2002 e novembro de 2003, onde foram obtidos os perfis dos bulbos seco e úmido, além da velocidade do vento em sete níveis de medida. Entre julho de 2001 a junho de 2004 foram atribuídas notas de desenvolvimento fenológico dos cultivos, além de se avaliar, o crescimento das plantas em altura e diâmetro da copa. Nas safras de 2002, 2003 e 2004 foram avaliados os parâmetros de produção nos dois sistemas de cultivo...

Understanding sugarcane yield gap and bettering crop management through crop production efficiency.

MARIN, F. R.
Fonte: MARIN, F. R. (Ed.). Crop management - cases and tools for higher yield and sustainability. Croatia: InTech, 2012. Cap. 6. Publicador: MARIN, F. R. (Ed.). Crop management - cases and tools for higher yield and sustainability. Croatia: InTech, 2012. Cap. 6.
Tipo: Capítulo em livro técnico-científico (ALICE) Formato: p. 109-118.
EN
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The comparison among farming systems and regions would improve the understanding of how and what driving factors explains the crop yield variability over time and space. Very often, however, farm managers and policy makers fall in difficult to establish reliable indexes to compare farming systems plots and regions. Having a quantitate index, we could derive relationships regarding climate, soil and socioeconomic, as well as to determine which factors contribute or hinder the development in a given region and time. Monteith (1977) suggested agroecosystems as machines that utilize solar energy to maintain composition and organization. From a thermodynamic standpoint, the efficiency of any process can be expressed as the ratio of energy output to energy input. Since the 1970s, this concept has been applied to analyze the energy flow in agroecosystems, as well as to analyze the relation between biomass chemical energy and incident solar radiation. We could apply this approach to understand the regional agricultural development and crop yield gap, once it could elucidate biophysical factors, such as the pedoclimatic conditions, affecting crop yields at a local scale. However, for a broader evaluation, one should also include structural components...

The effect of crop residue layers on evapotranspiration, growth and yield of irrigated sugarcane

Olivier,FC; Singels,A
Fonte: Water SA Publicador: Water SA
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2012 EN
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A layer of harvest residues from the previous crop can reduce wasteful evaporation from the soil surface and thereby increase the efficiency of use of limited water resources for agricultural production. The practice of harvesting sugarcane green and leaving crop residues in the field, as opposed to burning the residue, has been re-adopted in many sugarcane industries worldwide. However, a better understanding of the dynamic impacts of residue layers on various aspects of the cropping system is required to (1) enable the formulation of sets of best management practices for specific production scenarios, and (2) promote the use of residue layers in areas where it is desirable and has not been adopted, such as irrigated sugarcane production in South Africa. The objective of this study, therefore, was to quantify the effect of 2 different types of residue layers on crop growth, cane yield and evapotranspiration of fully irrigated sugarcane. A layer of cane tops and dead leaves (Trash) and a layer of green tops (Tops) were applied to the soil surface of sugarcane crops (plant crop and first ratoon crop of variety N14) grown on lysimeters at Pongola, South Africa. Observations of crop growth (stalk population, stalk height, canopy cover)...