AGROMETEOROLOGICAL SUNFLOWER YIELD PREDICTION MODEL: I. WATER INDEX AND YIELD RELATIONSHIP.
Abstract
The water index used in this study (ETr/ET0) is the relation from the real evapotranspiration to the potencial or referential evapotranspiration, for a given subperiod of the sunflower cycle. For the study of the relation between the sunflower grain production and the water index above referred, were avaliatedVcrop data, involving yield and phenology, obtained from 53 experiments of cultivars evaluation; meteorological daily data of solar radiation, air temperature, rainfall, air relative humidity, and wind velocity; sou data related to the storage of available water; and the definition of the four subperiods of sunflower development, crop establishment, vegetative, reproductive, and grain physiological maturity. The results showed a high assotiation betweenn grain yield and the water index in the reproductive subperiod, followed by the vegetative, and the final filling grain until physiological maturity subperiod.
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