SUNFLOWER MAXIMUM YIELD PRODUCTION BASED ON SOLAR RADIATION AND TEMPERATURE: I. ABSORPTION OF PHOTOSYNTHETICALLY ACTIVE RADIATION.
Abstract
Growth and maximum yield (Ym) of sunflower was modeled based on the effective temperature (degree-day s) and photosyntheticaly active radiation absorved and accumulated (PARaa) under well watered conditions. Experimentawere performed on a field site at Taquari (RS) during two growth seasons (1991/92, 1992/93). The results showed that theleaf ares index (LAI) can be stimated from the sum of the efective temperature. The absortion of PAR is very closelyassociated with the LAI and the canopy structure, that is represented by the extinction coeficient (K).
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