Effects of Humic Acid and Phosphorus Applications on Growth and Phosphorus Uptake of Corn Plant (Zea maysL.) Grown in a Calcareous Soil

The aim of this study is to investigate the effects of different humic acid and phosphorus levels on corn plant ( Zea mays null L.) growth and P availability in a calcareous soil. Four levels of P (0, 20, 40, 80 mgkg-1) and 3 levels of humic acid (0, 250, 500 null mgkg-1) were used in the experiment. The results showed that the dry weight, plant P concentration, P uptake and residual available null P amount increased with humic acid...