استجابة نبات الذرة الصفراء للتسميد البوتاسي عند مستويات مختلفة من النتروجين في تربة جبسية

Abstract

Afield factorial experiment was conducted in gypsiferous soil to study effect of potash and nitrogenous fertilization in some characters of growth and yield of corn included RCBD design using four levels of KCl (0 , 80 , 140 and 200) kgK.ha-1 with four levels of urea (0 , 240 , 280 and 320) kgN.ha-1. Half quantity added with planting, anther half added after (30) day from germination, TSP added to all unites (200) kgP2O5.ha-1 . The results showed significant increase in characters with adding potash fertilization. Nitrogen fertilizer increased this characters. The interaction between (200) kgK.ha-1 and (320) kgN.ha-1 gave highest means in plant height reached (198.66) cm, leaf area (654.54) cm2, Weight of (500) grains (157.74) g, grain yield (8.48) ton.ha-1 and biological yield (15.00)ton.ha-1. This interaction gave highest percentage nitrogen, potassium and phosphorus in grains reached (2.11 , 0.42 and 0.43) % respectively and highest mean of available potassium in soil after harvested (231.55) ppm.