Comparative economics, monetary and yield advantages from NPK fertilization to onion

abonos fosfatados abonos nitrogenados abonos potasicos allium cepa analyse coût avantage análisis de costos y beneficios application rates augmentation de rendement aumento del rendimiento cost benefit analysis crop yield dose d'application dosis de aplicación engrais azoté engrais phosphaté engrais potassique 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 increases