الفهرس 
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Abstract
Two field experiments were carried out and repeated
during 1989 and 1990 seasons at Bahtim Agricultural Research
Station. Agricultural Research. Center, located in Kalubia
Governorate in South Delta. The first experiment: aimed to investigate the effects of seeding rate, thinning date and their interaction on growth, yield and its components, earliness and fiber properties of the late planted cotton. The experiment included 12 treatments which were the combination of 3 seeding rates and 4 thinning dates. Seeding
rates were 5,10 and 15 seeds per hill. These numbers indicate
the need of about 16.7. 33.3 and 50lc:g seed/fed. , respectively. Thinning dates were 20, 25, 30 and 35 days from
planting.Planting date was 1st of May in the first season and
25th of April in the second one. A split plot design was used
with 4 replications. The main plots were devoted to number of
seeds per hill and sub-plots to thinning date. The sub-plot
area was 12.6m2 and cotton was planted on ridges 60em apart
and seeds were placed in hills 20em apart. The second experiment: aimed to investigate the effects of
distance between hills. nitrogen fertilization level and
their interaction on growth, earliness and fiber properties of
included 16 treatments which were yield late and its components, planted cotton. It the combination of four
distances between hills (15, 20. 25 and 30cm or 93333, 70000,
56000 and 46666 plants/fed., respectively) and four nitrogen
levels (20, 40, 60 and 80kg N/fed.) A split plot design was
used with 4 replications. The main plots devoted to distance
between hills and sub-plots to nitrogen levels. The sub-plot
area was 12.6m2. Ridges were 60cm apart and 4.2 m in length.
The new cotton cultivar Giza 83 (Giza 67 X Giza 72 hybrid) was used in both experiments. Planting date was similar to that of the first experiment. The soil of the experiments was clay loam in texture with a pH value of 8.1 and has 0.85% organic matter content and 0.095% total nitrogen. The normal cultural practices for growing cotton were followed.