Influence of some stimulating compounds and nitrogen fertilizer levels on growth and yield of hybrid rice

the effect of some stimulating compound applications and nitrogen fertilizer levels on growth and yield of Hybrid 1 (Egyptian hybrid rice). Nitrogen fertilizer levels were (50,100, 150 and 200 kg N ha 1). Stimulating compounds were ascorbic acid, ascobien (13% citric acid, 25% ascorbic acid plus 62% organic materials), hammer (86% humate potassium), pepton (85% amino acid + 12% organic nitrogen + 3% k2o) and water as a control. All these compounds were applied twice with the concentration of lg/litre as a foliar application at 25 and 40 days after transplanting. Increasing nitrogen level from 50 to 200 kg N ha-1 caused significant increase in each of plant height (cm), dry weight (g/m2), number of tillers hill1, number of panicles hill1, panicle weight, panicle length, number of filled grains panicle'', number of unfilled grains panicle -1, grain and straw yields and nitrogen uptake by grains in both seasons. The levels of 150 and 200 kg N ha -1 were statistically at par in most growth measurements and yield attributes in both seasons. The highest grain yield was obtained due to the application of 200 kg N ha -1 in both seasons .Foliar application of ascobien caused significant increase in each of plant height (cm), dry weight (g/m2) and number of tillers hill-1, number of panicles hill-1, panicle weight, number of filled grains panicle-1, number of unfilled grains panicle-1, 1000-grains weight, grain and straw yields and N uptake compared with other stimulating compounds in both seasons. The differences among foliar spraying with ascorbic acid, humic acid, pepton and water (control) were not significant in most studied traits in both seasons. The interaction between nitrogen level and stimulating compounds had a significant effect on grain yield in the two seasons. It can be concluded that, nitrogen level 150 kg N per hectare and foliar application with ascobien could be recommended for optimum grain yield of Hybridl at Kafrelshiekh Governorate. This result indicated that foliar application of ascobien can be saved 50kg N ha-1 without reduce grain yield.