Potential Productivity, Yield Gap, and Water Balance of Soybean-Chickpea Sequential System at Selected Benchmark Sites in India.Global Theme 3: Water, Soil, and Agrobiodiversity Management for Ecosystem Health Report No.1 uri icon

abstract

  • ICRISAT?s intervention in the project ?Improving Management of Natural Resources for SustainableRainfed Agriculture? funded by the Asian Development Bank aims to increase the productivity andsustainability of the medium and high water-holding capacity soils in the intermediate rainfall ecoregion ofIndia, Thailand, and Vietnam. Soybean is the predominant crop in the target region of India and has thepotential to be followed by chickpea crop on a larger scale in the postrainy season. Using the CROPGROmodels of soybean and chickpea, this study examined the potential yields, yield gap, and water balance ofthe soybean-chickpea sequential system for the 24 selected benchmark sites within the soybeanproduction zones of India. Considering the variability in soils and climate, this simulation study showedthat the average potential productivity of the soybean-chickpea system under rainfed situation rangedfrom 1390 to 4590 kg ha-1 across sites. The current level of productivity of the system across sites rangesfrom 970 to 1780 kg ha-1. The yield gap of 200 to 3300 kg ha-1 for the system indicate the potential toincrease productivity with improved management under rainfed situation. However, higher increases inyields would be possible in good rainfall years or with supplemental irrigation. Water balance analysisshowed that on an average 35 to 70% of rainfall was used by the crop as evapotranspiration, whereas 25 to40% was lost as surface runoff indicating the need for water harvesting for supplemental irrigation or torecharge the groundwater in the target region. Various constraints limiting crop yields in these regions havebeen highlighted. It is suggested that location-specific integrated approaches would be needed to bridgethe yield gap of the predominant crops grown in the target regions

publication date

  • 2002