S. B. Idso et al. of US presented the model of crop yield estimate of SDD (Stress Degree Days). They made field experiments in several regions of US for a few years, with very good results, the correlative eoefficient...
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S. B. Idso et al. of US presented the model of crop yield estimate of SDD (Stress Degree Days). They made field experiments in several regions of US for a few years, with very good results, the correlative eoefficients being as high as 0.98. In the use of this model, we met two points demanding improvements: (ⅰ) The transition of crop albedo is not sharp enough to decide the day on which summation is to
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