Modelling economic impacts of deficit irrigated maize in Brazil with consideration of different rainfall regimes

Rodrigues, G. C.; Martins, Juliano Dalcin; Silva, Francisco G. da; Carlesso, Reimar; Pereira, Luís S.

doi:10.1016/j.biosystemseng.2013.07.001

Cited by 10 publications

(6 citation statements)

References 59 publications

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“…Irrigation is optimised when water deficits are avoided during drought-sensitive growth stages of a crop; outside these periods, irrigation may be limited or even unnecessary. Thus, the adoption of deficit irrigation implies appropriate knowledge of crop water requirements, effects of water deficits at the various crop growth stages on crop physiology and yield, and the economic impacts of yield reduction strategies (English & Raja, 1996;Paredes, Rodrigues, Alves, & Pereira, 2014;Pereira, Oweis, & Zairi, 2002;Rodrigues et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The system presently monitors more than 120,000 ha every year in different climatic regions of Brazil, including high-rainfall areas in the south and low-rainfall areas in central Brazil. Deficit irrigation has been considered as a valuable strategy to be implemented with the IRRIGA system in order to maximise water productivity in water scarce regions (Rodrigues, Martins, Silva, Carlesso, & Pereira, 2013). Irrigation is optimised when water deficits are avoided during drought-sensitive growth stages of a crop; outside these periods, irrigation may be limited or even unnecessary.…”

Section: Introductionmentioning

confidence: 99%

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Modelling soil water dynamics of full and deficit drip irrigated maize cultivated under a rain shelter

González

Ramos

Carlesso

et al. 2015

Biosystems Engineering

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Published onlineKeywords: Brazil Dual Kc approach HYDRUS-1D Numerical inversion SIMDualKc Water balance simulationThe model HYDRUS-1D was used to simulate soil water dynamics of full and deficit irrigated maize grown under a rainout shelter during two crop seasons. Four irrigation treatments were established based on the amount of water applied to fulfil crop water requirements.Treatment D1 was irrigated to fully satisfy crop water requirements, while treatments D2 (mild deficit), D3 (moderate deficit), and D4 (severe deficit) were for increased controlled water stress conditions. The computation and partitioning of evapotranspiration data into soil evaporation and crop transpiration was carried out with the SIMDualKc model, and then used with HYDRUS-1D. The soil hydraulic properties were determined from numerical inversion of field water content data. The compensated root water uptake mechanism was used to describe water removal by plants. The HYDRUS-1D model successfully simulated the temporal variability of soil water dynamics in treatments irrigated with full and deficit irrigation, producing RMSE values that varied between 0.014 and 0.025 cm 3 cm À3 when comparing model simulations with field measurements. Actual transpiration varied between 224 and 483 mm. Potential transpiration reductions varied from 0.4 to 48.8% due to water stress, but plants were able to compensate for the water deficits in the surface layers by removing more water from the deeper, less stressed layers. HYDRUS-1D water balance estimates were also comparable with the corresponding ones determined with the SIMDualKc water balance model. Both modelling approaches should contribute to improve the webbased IRRIGA system, used to support farm irrigation scheduling in Brazil.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling soil water dynamics of full and deficit drip irrigated maize cultivated under a rain shelter

González

Ramos

Carlesso

et al. 2015

Biosystems Engineering

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“…Rodrigues et al . (2013 a ) showed that irrigation management, water distribution uniformity, soil salinity, crop variety, soil-water conservation and fertility, pests and diseases can affect soybean yield. In particular, soybean Asian rust pressure is increased when the crop is irrigated.…”

Section: Introductionmentioning

confidence: 99%

The soybean yield gap in Brazil – magnitude, causes and possible solutions for sustainable production

et al. 2015

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Brazil is one of the most important soybean producers in the world. Soybean is a very important crop for the country as it is used for several purposes, from food to biodiesel production. The levels of soybean yield in the different growing regions of the country vary substantially, which results in yield gaps of considerable magnitude. The present study aimed to investigate the soybean yield gaps in Brazil, their magnitude and causes, as well as possible solutions for a more sustainable production. The concepts of yield gaps were reviewed and their values for the soybean crop determined in 15 locations across Brazil. Yield gaps were determined using potential and attainable yields, estimated by a crop simulation model for the main maturity groups of each region, as well as the average actual famers' yield, obtained from national surveys provided by the Brazilian Government for a period of 32 years . The results showed that the main part of the yield gap was caused by water deficit, followed by sub-optimal crop management. The highest yield gaps caused by water deficit were observed mainly in the south of Brazil, with gaps higher than 1600 kg/ha, whereas the lowest were observed in Tapurah, Jataí, Santana do Araguaia and Uberaba, between 500 and 1050 kg/ha. The yield gaps caused by crop management were mainly concentrated in South-central Brazil. In the soybean locations in the mid-west, north and northeast regions, the yield gap caused by crop management was <500 kg/ha. When evaluating the integrated effects of water deficit and crop management on soybean yield gaps, special attention should be given to Southern Brazil, which has total yield gaps >2000 kg/ha. For reducing the present soybean yield gaps observed in Brazil, several solutions should be adopted by growers, which can be summarized as irrigation, crop rotation and precision agriculture. Improved dissemination of agricultural knowledge and the use of crop simulation models as a tool for improving crop management could further contribute to reduce the Brazilian soybean yield gap.

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“…Para além da expansão e intensificação das áreas irrigadas, há a necessidade de melhorar a relação entre segurança alimentar e o uso de recursos hídricos, com foco na conservação da água e dos solos, adoção de variedades mais adaptadas às condições locais, redução do uso de energia e modernização dos sistemas de irrigação (HANJRA; QURESHI, 2010). De acordo com Rodrigues et al (2013b), somente 19% das áreas cultivadas no mundo são irrigadas, porém, contribuem com 40% do fornecimento de alimentos, além dos ganhos econômicos associados a atividade. O manejo adequado dos recursos hídricos é fundamental para melhorar a eficiência do uso da água na agricultura irrigada (CARLESSO et al, 2011).…”

Section: Introductionunclassified

Agricultura irrigada no Brasil: ciência e tecnologia

2022

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O desenvolvimento e crescimento da irrigação e da agricultura irrigada sem dúvida passam pelo desenvolvimento tecnológico, tanto relacionado aos equipamentos quanto ao sistema de produção irrigada. A tecnologia embarcada nos sistemas irrigados tem ampliado de forma significativa nos últimos anos, a automação tem sido efetivamente utilizada em sistemas de irrigação por aspersão e localizada, auxiliando de forma efetiva no controle da irrigação. Destacam-se também as tecnologias associadas ao manejo da irrigação, permitindo aplicação da água de forma técnica, garantindo produção e produtividade com eficiência no uso do recurso hídrico, energia e mão-de-obra. O uso maciço de imagens via satélite e vants em nível de projeto, manejo e acompanhamento da lavoura irrigada, têm ampliado de forma significativa os controles de uso da água e estimativas de produtividade. A tecnologia de irrigação no Brasil expandiu-se de forma importante nos últimos, seja por meio de um parque industrial de alto nivel e uma rede de revendas técnicas, seja pela expansão da pesquisa e pelo desenvolvimento técnico nas universidades e instituições de pesquisa. Toda esta infraestrutura tecnológica tem sido colocada à disposição de uma agricultura irrigada aliada a segurança alimentar e a sistema de produção sustentável. Este livro contempla diferentes abordagens da agricultura irrigada no Brasil no aspecto da técnica e da tecnologia, constituindo uma importante contribuição de inúmeros especialistas para o desenvolvimento sustentável da agricultura irrigada brasileira e mundial.

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Modelling economic impacts of deficit irrigated maize in Brazil with consideration of different rainfall regimes

Cited by 10 publications

References 59 publications

Modelling soil water dynamics of full and deficit drip irrigated maize cultivated under a rain shelter

Modelling soil water dynamics of full and deficit drip irrigated maize cultivated under a rain shelter

The soybean yield gap in Brazil – magnitude, causes and possible solutions for sustainable production

Agricultura irrigada no Brasil: ciência e tecnologia

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