EFFECT OF NITROGEN FERTILIZER LEVELS AND ITS APPLICATION TIMES ON SOYBEAN PRODUCTIVITY | ||
| Journal of Soil Sciences and Agricultural Engineering | ||
| Article 3, Volume 29, Issue 8, August 2004, Pages 4757-4767 PDF (3.25 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jssae.2004.242528 | ||
| Authors | ||
| R.E. Knany; A.S.M. EI-Saady; R.H. Alia | ||
| Soils, Water and Environment Res. Inst., Agric. Res. Center, Giza, Egypt | ||
| Abstract | ||
| Two field experiments were carried out at Sakha Agriculture Research Station Farm during two successive summer seasons of 2002 and 2003 using soybean (Glycine max L.) variety Giza 111. Split plot design was used. The main plots were assigned to three nitrogen application times: 1- applicating of nitrogen fertilizer with the first irrigation (T,), 2- applicating of nitrogen fertilizer with the second irrigation (T2), 3- applicating of nitrogen fertilizer with the third irrigation (T3). The sub plots were allotted for four nitrogen levels i.e., 0 (No), 20 (N20), 40 (N40) and 60 (Nso) kg N fed:' to investigate the effect of nitrogen apptication times and levels on soybean seed, straw, protein and oil y:ields kg fed:' as well as residual available N and P in the soil. The plot area was 15 m2. The obtained results show that nitrogen application times high significantly affected seed, straw, oil and protein yields. T, treatment gave the highest straw yield in both seasons. While T2 treatment gave the highest seed yield (996 and 965 kg fed- \ oil yield (231 and 287 kg fed-') and protein yield (356 and 346 kg fed") in the first and second s. sons, respectively. Nitrogen levels high significantly affected seed, straw, oil and protein yields. The highest values were obtained with Nee treatment. Applicating of nitrogen fertilizer with the second irrigation T2 increased nitrogen use effici.,..,t;y. On the other hand, increasing nitrogen fertilizer levelled to clear decree _ . in nitrogen use efficiency values. T3 treatment gave the highest nodules number, nodules dry weight and the residual N, P in the soil. Neo treatment had the highest nodules number and nodules dry weight. | ||
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