Suitable level of N, P and K for harvesting the maximum economic returns of sunflower (Helianthus annuus L.)

abonos fosfatados abonos nitrogenados abonos potasicos analyse coût avantage analyse économique análisis de costos y beneficios análisis económico application rates caracteres de rendimiento composante de rendement cost benefit analysis crop yield dose d'application dosis de aplicación economic analysis engrais azoté engrais phosphaté engrais potassique helianthus annuus nitrogen fertilizers pakistan pakistán phosphate fertilizers potash fertilizers potassium sulphate rendement des cultures rendimiento de cultivos sulfate de potassium sulfato de potasio superfosfato superphosphate urea urée yield components