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Growth and yield responses of soybean in Madhya Pradesh, India to climate variability and change

Lal, M and Singh, KK and Srinivasan, G and Rathore, LS and Naidu, D and Tripathi, CN (1999) Growth and yield responses of soybean in Madhya Pradesh, India to climate variability and change. Agricultural and Forest Meteorology, 93 (1). pp. 53-70.

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This study is aimed at assessing the impact of thermal and moisture stresses associated with observed intraseasonal and interannual variability in key climatic elements on the nature and extent of losses in growth and yield of soybean crop in central India through the use of CROPGRO model. The crops are found to be more sensitive to higher cumulative heat units during cropping season. The yields respond substantially to temporal variations in rainfall (associated with observed swings in the continuity of monsoon). Prolonged dry spells at critical life stages of the soybean crop are found to adversely affect crop development and growth and hence the yields at selected sites. We have also examined the plausible effects of future climate change on soybean yields in the selected region based on simulations carried out for doubled atmospheric CO2 level and with modified weather variables using the available seasonal projections for the future. Our findings on the response of elevated CO2 concentrations in the atmosphere suggest higher yields (50 increase) for soybean crop for a doubling of CO2. However, a 3°C rise in surface air temperature almost cancels out the positive effects of elevated CO2 on the yield. Soybean crops at selected site are more vulnerable to increases in maximum temperature than in minimum temperature. The combined effect of doubled CO2 and anticipated thermal stress (likely by middle of the next century) on soybean crop is about 36 increase in yield at the selected sites. A decline in daily rainfall amount by 10 restricts this yield gain to about 32. Deficient rainfall with uneven distribution during the monsoon season could be a critical factor for the soybean productivity even under the positive effects of elevated CO2 in the future.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier.
Uncontrolled Keywords: climate change; soybean, India
Subjects: Meteorology and Climatology
Depositing User: Administrator ePrints@MoES
Date Deposited: 01 Jul 2015 10:12
Last Modified: 01 Jul 2015 10:16

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