Abstract
The productivity of a crop depends on the ability of plant cover to intercept the incident radiation, which is a function of the leaf area available, the architecture of vegetation cover and conversion efficiency of the energy captured by the plant in biomass. Water stress and nutrition reduce leaf area index (LAI) to a smaller size and greater leaf senescence. The smaller size of LAI agrees with light capture and thus crop growth, decreasing the efficiency of radiation. The measurement of radiation intercepted by a crop for formation of leaf area is an important factor in monitoring crops, water relations studies, nutrition, and in crop simulation models.
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