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The present paper describes the results of a ground experiment conducted on major crops of India during December 1980 to April 1981 and October 1981 to April 1982. The crops selected were wheat, chickpea and mustard. The experiment was jointly conducted between the Indian Space Research Organization (ISRO) and the Indian Agricultural Research Institute. Canopy spectral reflectance and physiological variables were measured over the complete crop cycle. The results of the 2 year experiment led to the following conclusions: (i) spectral parameters can be used for detecting water and nutrient stress in crops, (ii) spectral parameters are highly correlated to physiological variables and final production, (iii) correlation is further improved by including the effect of weather parameters, (iv) stress degree day is highly correlated to grain yield and (v) a yield model based on photosynthesis calculation worked well for the wheat experiment.
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Kamat et al. (1985) studied this question.
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