A field experiment was carried out at Bahtim Agricultural Research Station Farm through 2013/2014 and 2014/2015 seasons. The experimental site is located at lat. 30.80, long 31.16 and 14.00 m above the mean sea level, to study the effect of foliar spray of some antioxidants (ascorbic, citric and salicylic acids) under three nitrogen fertilizer rates (40, 60 and 80 kg N fed -1 ) and their interactions on yield and its attributes as well as macronutrients uptake and protein percentage of bread wheat variety (Misr 1). The obtained results could be summarized as follows:1-Application of the highest nitrogen fertilizer rate (80 kg N fed -1 ) gave a significant increase in grain weight spike -1 , spike number spike m -2 , grain number spike -1 and 1000 grain weight (g). Also, grain, straw, biological yield and harvest index as well as NPK uptake of wheat grain, straw, biological and protein % of grain were increased significantly when adding 80 and 60 kg N fed -1 in both seasons.2-Generally, in most cases, foliar application of any organic acids (ascorbic, citric or salicylic) gave a significant increases in yield and its some components as well as macronutrients uptake and protein percentage of wheat in both seasons. 3-The highest significant values of some yield components, grain, straw, biological yield and harvest index as well as NPK uptake of wheat grain, straw and biological were noticed by spraying any organic acid under soil application of 60 or 80 kg N fed -1 in both seasons. Thus, the increases in wheat yield (quality and quantity)may be attributed to the organic acids guide to an enhancing wheat plant growth and promote its nutrients uptake as well as improving the efficiency of nitrogen fertilizer. So, under the same conditions we can reduce the recommendation of nitrogen fertilizer for wheat from 80 to 60 kg N fed -1 with foliar application with ascorbic, citric or salicylic acids to get the best possible wheat productivity.
A field experiment was conducted at Bahtim Agricultural Research Station Farm during 2012/2013 and 2013/2014 seasons. The experimental site is located at lat. 30.80, long 31.16 and 14.00 m above the mean sea level.The objective of this study was to evaluate the effect of nitrogen fertilizer rates (40, 60 and 80 kg N fed -1 , with or without foliar application of ascorbic acid) on maximizing wheat yields and its attributes and grain quality of three wheat cultivars as a main-plots. The Egyptian bread wheat cultivars were Misr1, Misr2 and Gemmiza11. The experiment was designed in a split plot design with three replicates. The results indicated that: The highest significant value of spike number m -2 was noticed when wheat cultivar Mesr1 was planted compared to other bread wheat cultivars in both seasons. Also, 1000 grain weight and N uptake by wheat were significantly increased by planting Misr2. The number and weight of grain spike -1 were significantly increased when wheat cultivar Misr1 or Misr2 were planted compared to Gemmiza11 in the first season and vice versa in the 2 nd one. Cultivar of Misr2 gave higher grain, straw, biological yield and harvest index as well as N, P and K uptake in grains than other cultivars in the first season only. Meanwhile, the grain, straw and biological yield as well as N, P and K uptake of wheat straw were significantly improved by planting Misr1 compared to the other cultivars in the second season. Also, data reveal that the planting of Misr1 and Gemmiza11gave the highest increase of N, P and K uptake of grain and biological yield compared to Misr2 in the second season only. Generally, in most cases, application of both nitrogen level (80 or 60 kg Nfed -1 ) with ascorbic acid gave the highest significant values of most yield components, grain, straw, biological yield and harvest index as well as N, P and K uptake of grain, straw, and biological as well as protein % in grain compared with other treatments in both seasons. Over all, the application of 80 or 60 kg N fed -1 with ascorbic acid to any bread wheat cultivars gave a significant increase of wheat yield components, grain, straw biological yield and harvest index as well as N, P and K uptake in grains, straw and biological and also protein % of grain in both seasons.
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