Authors : A.H.A. Hussein
Abstract: Corn varieties respond differently to phosphorus fertilization. Method of P application may influence the degree of responsiveness. In this study, two varieties of corn (Hageen Asgro and Hageen Niagra) were grown under different rates of phosphorus fertilizer (0, 30, 60 and 90 kg P2O5 ha-1) by two methods, soil mixing at sowing and fertigation at three doses. Grain yield, shoot fresh weight, shoot dry weight, weight of 100 kernel, P content and uptake were determined. The data obtained after crop harvest showed that increasing rates of P supply had significantly effect on grain and shoot fresh yield, P content and uptake. Application of P by either method increased grain and shoot fresh yield as well as P uptake over control. P application methodxP interaction effect was also significant for yield, indicating higher yield response due to fertigation compared to soil mixing method of P application. Phosphorus application through fertigation technique was more beneficial and has high P efficiency of use and utilization by corn. Also, Hageen Niagra variety was superior over Hageen Asgro variety concerning the phosphorus efficiencies. Soil available p-values obtained at the end of growing period increased significantly with increasing rates of added P. Thus, application of phosphatic fertilizer by fertigation along with selection of an appropriate variety may contribute to improve P fertilizer efficiency and increase corn grain yield.
A.H.A. Hussein , 2009. Phosphorus Use Efficiency by Two Varieties of Corn at Different Phosphorus Fertilizer Application Rates. Research Journal of Applied Sciences, 4: 85-93.