Effect of temperature on wheat in India
1989
Dadhiwal, V.K.
The phenology, yield, and yield components of four wheat cultivars were studied for three years (1979-80 to 1981-82) at New Delhi in a date-of-sowing experiment. Crop stages used were sowing (SOW), first spikelet initiation (FSI), terminal spikelet initiation (TSI), anthesis (ANT), and end of grain filling (MAT). Multiple regression analysis was used to relate the duration of four growth phases - SOW-FSI, FSI-TSI, TSI-ANT, ANT-MAT - to means of temperature, photoperiod, and solar radiation in each phase. Photothermal, and thermal unit requirements of preanthesis and grain growth, respectively, were estimated. The latter could be used to predict duration of grain filling in different parts of India. Temperature effects on kernel weight and kernel number were quantified. A procedure based on factor analysis was used to estimate the effect of increments in temperature during each phase on final grain yield.
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