الفهرس 
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Abstract
Two field experiments were carried out at the Agricultural Research and Experiment Center of the Faculty of Agriculture, Moshtohor, Zagazig University during 2000/2001 and 2001/2002 seasons.
The aim of the experiments was to study the effects of 3 levels of FYM (0, 15 and 30 tlfad), 4 N levels (0, 25, 50 and 75 kg N/fad) and 2 levels of P fertilizer (0 and 22.5 kg P205/fad) on the growth and yield of wheat (cv. Gemmeieza 9) and on weed infestation in wheat plots.
The soil of the experiments was clay in texture and contained 2.20% OM, with a pH value of 8.1.
A split-split plot design with 4 replications was used. The main plots were devoted to FYM treatments, the sub-plots for N levels and the sub-sub plots for P levels. Treatments were randomly distributed in the respective plots. The sub-subplot area was 10.5 m2 in size.
The normal cultural operations of wheat growing in the region were followed.
Data on growth, grain and straw yields, yield components were collected. The spread of weeds at 90 days from sowing was estimated as fresh and dry weight of total weeds (g/m2).
The results could be summarized as follows:
I. Effect of FYM:
1.The application of FYM significantly delayed heading and maturity dates in both seasons.
2.Plant height was significantly increased by the application of FYM (in the second season). Also FLA significantly increased due to FYM application in both seasons.
3.Number of spikes/m2 was significantly increased by FYM application in both seasons.
4.Spike length, number of spikelets/spike, 1000-kernel weight and protein content in grains were not significantly affected by FYM application in both seasons.
5.Number of kernels/spike was significantly increased by FYM application in the second season.
6.The application of FYM significantly increased biological yield, grain yield and straw yield in both seasons. The greatest increase was observed with straw yield/fad, where the application of 15 and 30 t FYM/fad increased straw yield over the check treatment by 16.36 and 63.55% in 2000/2001 season, respectively, corresponding to 12.44 and 61.56% in 2001/2002 season.
7.Harvest index was significantly reduced due to applying FYM in both seasons.
8.N uptake in grain was significantly increased by the application of FYM in the second season.
9.The application of FYM significantly increased the spread of weeds in wheat in both seasons. The diy weight of weeds (g/m2) was increased by 19.68 and 13.51% due to
application of 30 t FYM/fad, compared with untreated plots in the first and second season, respectively.
II. Effects of N levels:
1.The increase in N level significantly delayed heading and maturity dates in both seasons.
2.Increasing N application levels significantly increased plant height, FLA, number of spikes/m2, spike length, number of spikelets/spike (in the second season), number of kernels/spike, 1000-kernel weight, biological yield, grain yield, straw yield, protein content in grain and N uptake in grain in both seasons.
3.The application of 25, 50 and 75 kg N/fad significantly increased grain yield over the check treatment by 47.54, 65.87 and 73.66% in 2000/2001 season, respectively, being 50.27, 66.37 and 65.37% in 2001/2002 for the respective N levels.
4.The highest grain yield was achieved by combining 15 t FYM + 50 kg N/fad, where grain yield recorded 2.89 and 2.90 t/fad in the first and second season, respectively (19.26 and 19.34 ardab/fad).
5.The application of N up to 50 kg/fad significantly increased HI in both seasons, whereas increasing N level to 75 kg/fad reduced markedly HI.
6.Raising N level significantly increased weed density in both seasons. The application of 75 kg N/fad significantly increased dry weight of total weeds (g/m2) by 58.33 and
58.32% in the first and second season, respectively, compared with the check.