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Abstract
SUMMARY AND CONCLUSION
The present investigation aimed at studding the effect of nitrogen fertilization and sulfur application on growth, quality and chemical composition of wheat crop at the experimental farm of faculty of Agriculture (Saba Basha), Alexandria university, for the two successive growing seasons 2006/2007 and 2007/2008.
The experimental design was split – plot with four replications, (variety Sakha 93) the main plots were devoted the three sulfur levels (zero, 200 and 400 kg S/ fed) and the sub – plot were allocated the five nitrogen levels (0, 25, 50, 75 and 100 kg N/fed.) in the form of urea (46.5 % N) to be applied at three doses, 20 % at sowing, 40 % applied before the first irrigations and 40 % was applied before the second irrigation.
The attained results could be summarized as follows:
5.1. Growth attributes
Three samples were taken at random from each plot at 75, 95, 115 days from sowing to record the following data:
5.1.1. Plant height (cm)
Sulfur levels showed insignificant effects on plant height of the different three samples in the two seasons, except that, at 75 DAS in the second season.
At this growth stage sulfur level (200 kg S/fed.) was significant for plant height. Nitrogen fertilization had significant effect on plant height at three samples in the two growing seasons.
Increasing nitrogen levels caused significant increase in plant height up to 100 kg N/fed., at three samples in the two seasons.
5.1.2. Dry matter accumulation (g/m2)
Dry matter accumulation was insignificantly effected by sulfur levels application at the all samples in both seasons. Increasing nitrogen levels caused significant increase in dry matter accumulation up to 100 kg N/fed., at 75 DAS in the first season and the three samples in the second season.
5.1.3. Number of leaves
Sulfur application had a significant effect on number of leaves at 75 and 95 DAS in the second season only. Nitrogen application levels had significant effect on number of leaves up to 100 kg N/fed., at 75 and 115DAS in the first season and three samples in second one.
5.1.4. Leaf area index (LAI)
The sulfur application was significant for leaf area index at 75 and 115 DAS in the second season.
Leaf area index was significantly increased with increasing nitrogen level