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Field experiments in vertisols of low, medium and high available soil phosphorus status were conducted to study the response of graded levels of P application to sunflower hybrid (KBSH-1). Effect of P to sunflower in increasing yield and yield attributes was more pronounced in low P status soil. Response equations for seed yield of sunflower at an applied P level have been worked out. Nutrient use efficiency and productive efficiency were also computed. Soil available P status was found to vary significantly only in low P status. Critical P level in soil was found to be 20 kg P ha -1 , below which sunflower may respond to phosphorus application.

helia

RESPONSE OF SUNFLOWER (Helianthus annuus L.) TO PHOSPHORUS APPLICATION IN VERTISOLS / REACCIÓN DE GIRASOL (Helianthus annuus L.) A APLICACIÓN DE FÓSFORO EN LOS SUELOS TIPO VERTISOL / RÉACTION DU TOURNESOL (Helianthus annuus L.) À L’APPLICATION DE PHOSPHORE DANS LE VERTISOL