Mazen O.A.O., A.M.M. Abdel- Fattah and A.A. Elmasry( 2013). Effect of Nitrogen Sources Application With Different Rates on Corn Plants (Zea Mays L.)Egypt.J.of Appl. Sci., 28 (4) 2013 56-69
Abstract: To investigate the effect of different sources of nitrogen fertilizer (urea, ammonium nitrate, ammonium sulphate, and anhydrous ammonia) application at the rates of (75, 90,105 and 120 kg N/fed.) on corn plant yield and index, nitrogen content, crude protein and carbohydrates contents in grains, under the field conditions of alluvial soil. Two successive field experiments carried out in the experimental farm of the Agric. Res. Center at Sakha, Kafr El-Sheikh Governorate, Egypt. The obtained results indicated that:
1-The application of anhydrous ammonia significantly produced the higher dry matter yield, nitrogen content, nitrate content, grain yield and index and crude protein percentage in grains but produced the lowest value of carbohydrate concentration in grains for corn plants in both seasons compared to the other nitrogen fertilizers.
2-Increasing nitrogen application rates up to 120 kg N/fed. significantly increased corn dry matter yield, nitrogen and nitrate content, grain yield and index and crude protein percentage in grains. While, significantly decreased amounts of carbohydrates in grains of corn plants in both seasons compared to the other rates.
At the rate of 120 kg N/fed. The highest values of dry matter yield, nitrogen and nitrate content, grain yield and index and crude protein percentage in grains were found by using anhydrous ammonia, but gave the lowest value of total carbohydrate in grains for corn plants in both seasons compared to the other combinations .While, urea application at the level of 75 kg N/fed. gave the lowest values of dry matter yield, nitrogen and nitrate content, grain yield and index and crude protein percentage in grains but it gave the highest value of total carbohydrate in grains for corn plants in both seasons.
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