الفهرس 
Effect of nitrogen fertilizer ratesOnly 14 pages are availabe for public view
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Abstract
This study was carried out during growing season of 2014 and 2015 at Gemmeiza Agriculture Research stations. Egypt. The main objective of this study was to estimate the effect of humic acid treatments and nitrogen fertilizer rates as well as their interactions on growth, grain yield and its components of white maize cultivar single cross 131( Sk. 13 x Sk. 9). Sowing was done on June 3rd in 2014 season, and June 9th in 2015 season. Nitrogen fertilization was added as the form of urea (46.6% N) and humic acid treatments was applied during the preparation of land. Three grains were hand sown in each hill. Thinning to one plant per hill was done before the first irrigation. Hoeing twice was done for controlling weeds before the first and second irrigations. Nitrogen fertilization and humic acid treatments was applied in three equal doses during sowing and before the first and the second irrigations, respectively, recommended pest control was applied when necessary.