تأثير التداخل بين الاجهاد المائي وتوليفات سمادية من المغذيات الكبرى في جاهزية NPK وامتصاصها من قبل الذرة الصفراء Zea mays L.

Abstract

A field experiment was carried out in Al- Saqlawyah – Fallujah /Anbar Governorate during Fall season of 2017 in order to study three levels of water stress Depletion of 25% , 50% and 75% of available water and application of phosphorus and potassium levels in increasing availability nitrogen , phosphorus and potassium in soil and their absorbance by maize . The Farm was divided into three replication according to split plots arrangement in RCBD where water stress treatments Occupied the min plots. While fertilizers levels occupied the sub plots in the sub plots in three replications. The field experiment included giving the whole recommended amount of required fertilizers, the same recommended amount and adding phosphorus, Potassium only and adding phosphorus and potassium together. The results showed: The treatment of adding phosphorus and potassium to the recommended amount was superior in availability of Nitrogen in soil, while the treatment of adding phosphorus only our the recommended amount in the availability of Phosphorus in soil. The treatment of adding potassium to the recommended amount was superior in the availability of potassium in soil. The treatment of depletion 75% of available water gave the highest average of element availability in soil. The treatment of adding phosphorus and potassium our recommended amount was superior in Nitrogen , phosphorus and potassium absorption in vegetative part of plant. While treatment of 25% depletion of available water gave the highest average of absorbance of Nitrogen , phosphorus and potassium in vegetative part of plant. Generally, the application of fertilizers enhanced the performance of plant under water stress.