“Impact of climate related multiple stresses on Soybean
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Date
2012
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
IARI, DIVISION OF ENVIRONMENTAL SCIENCES
Abstract
A field study was conducted with soybean during monsoon season of 2011 to quantify the response of soybean to short-term multiple stresses related to floods, drought and high temperature. For this the treatments of flooding, drought and high temperature alone and in five different combinations at different phases of crop growth viz., Irrigated as and when required; Rainfed; Rainfed-High temperature-Excess water –Drought; Rainfed-High temperature; Rainfed-Excess water-Drought-High temperature; Rainfed-Drought-High temperature-Excess water; Rainfed-Moderate drought were imposed on crop 30 days after sowing (DAS). For the first 30 days all plots were under rainfed condition. The first stress was imposed from 30-50 DAS; the second stress was imposed from 50-70 DAS and third from 70-90 DAS as per the sequence mentioned above. Overall results on phenology, leaf area index, biomass accumulationand distribution, yield and yield components indicate that the plants responded differentially to sequential stresses depending on the coincidence of the occurrence of type of stress. The sensitivity of crop parameters also differed with regards to sequential stresses. The results indicate that in soybean, water is the most important factor determining yield. The water stress during entire growth period or during the vegetative growth phase, the yields is severely affected in spite of having rainfall during the pod filling period. Results also indicate that soybean can withstand high temperature stress if water is not limiting. However, high temperature with water stress can adversely affect the yields. In seasons when heavy rainfall events coincide with vegetative growth period followed by dry spells during flowering and then good rainfall events in the pod filling period (PFP) will not affect the crop yield. On the other hand, dry spells during vegetative period, high temperature with good rains during flowering and heavy rains during PFP significantly reduces the yield. Growing soybean in high temperature areas with adequate irrigation can give satisfactory yields. Heavy rainfall events during flowering also seem to affect yield to lesser extent.
Description
T-8667
Keywords
climate change, climatic variability, monsoon, phenology, growth, yield