EFFECT OF WATER STRESS ON FERTILIZATION STRATEGY

Abstract

Two pot experiments were conducted to 1) evaluate certain fertilization systems, 2) evaluate both irrigation and fertilization interactions, respectively. The two mentioned experiments were carried out under greenhouse conditions. The irrigation during growing season was performed as to always have the soil moisture content at Field Capacity (FC). The soil was selected as a clay texture. Fertilization treatments include two rates of both nitrogen and potassium fertilization equivalent to 50 % and 100 % from the recommended dose by Egyptian Ministry of Agriculture for nitrogen (RDN) and potassium (RDK) applied as ammonium and potassium sulfates, respectively. Irrigation during growing season was performed as to reach 50, 75 and 100 % FC. Corn (Zea mays L.) was used as plant indicator for both experiments. Plant growth parameters as well as status of both nitrogen and potassium were evaluated for both shoots and roots. In addition, shoot:root ratio for those parameters were detected.