Nutrition of drip irrigated corn by phosphorus under sandy calcareous soils

Phosphorus (P) is an essential nutrient for the higher plants and has low mobility and availability in soils. Good fertilization management for this nutrient may be lead to increasing its availability. A field experiment in a split plot design was conducted out during the 2003 and 2004 summer growing seasons to study the effect of frequency of P fertigation and different forms of P fertilizers on uptake of P by corn plant as well as yield production. The high frequency of P fertigation increased P uptake significantly (p < 0.05) by 12 and 19% in the first and second season respectively. Phosphoric acids (PA) followed by urea phosphate (UP) gave the highest significant biological yield (25.67 and 24.5ton/ ha). From the results of this study, it may be recommended that in sandy calcareous soils P must be added every three days using acid forms.