Effect of distance from drain line on wheat crop under different rates of nitrogen fertilization in clay soil [electronic resource].

Includes references.

This study was carried out to evaluate the influence of distance from drain line on response of wheat (Giza 168 variety) to different levels of N-fertilizer. Two field experiments were conducted during 2003/2004 and 2004/2005 successive seasons. The experimental field provided with pipe drain network spaced at 20 m. with 1.2 m depth. N-fertilizer in the form of urea was added in three levels (50, 75 and 100 kg N/fed.) at U4 and U2 distance from drain line in two equal doses after the first and second irrigation, respectively. Resuns showed that 1000 grain weight (gm), grain yield (ardab/fed.) and straw yield (Heml/fed.) significantly increased as the distance from drain line decreased from U2 to U4 in both studied seasons. These increases were equivalent to 1.37 and 1.16 (gm), 1.43 and 1.89 (ardab/fed.) and 1.69 and 1.3 (Heml/fed.) in the first and second season, respectively. Nitrogen uptake (%) by wheat at booting stage increased by decreasing distance from drain line from U2 to U4 and the increase was_significant in the second season with high wheat yield. Data also indicated that wheat grain and straw yield significantly increased with increasing applied nitrogen rate up to 100 kg N/fed. in both studied seasons. Weight of 1000 grain (gm) and nitrogen uptake % at booting stage respansed to the increment of nitrogen applied rate with a significant increase at the highest nitrogen rate (100 kg N/fed.).

Summary in Arabic.

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