Comparative Effectiveness of Urea and Calcium Ammonium Nitrate for Wheat Fertilization in South-Western Buenos Aires (Argentina)

摘要: The objective of this paper was to report on the relative effectiveness urea (U – 46% N) and calcium ammonium nitrate (CAN 27% for wheat fertilization in southwestern Buenos Aires Province (Argentina). Five experiments were carried out between 1996 1998. Treatments N rates (0 45/60 kg ha-1) sources CAN), applied broadcast at tillering. Crop variables studied were: crop yield (CY), protein grain concentration (CPG) (NY). Effect analyzed by comparison individual treatments calculation two parameters i) efficiency ratio (ER) ii) substitution value (SV). CAN gave higher values CY NY 4 5 CPG 50% cases. However, none these significant. Both ER SV varied with experiments. around 1.35, 1.25 0.98 CY, CPG. This means average response 35% plots fertilized CAN, very little reduction 1.5 i.e. U attained same as if increased 50%. An advantage using is that direct comparisons price ratios can be made a simple economic analysis. superiority related not only greater apparent recovery but also physiological efficiency. could explained through different availability time