الفهرس 
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Abstract
Two field experiments were carried out at private Farm at Shandawel Agricultural Research Station, Sohag, Egypt during two successive summer seasons; 2013 and 2014. The experiments aimed to investigate the response four genotypes to three planting dates and three levels population density
The study included 36 treatments, which were the combinations of three planting dates, four soybean genotypes and three population density treatments.
1- Days to 50% flowering :
Planting dates had a significant effect on Flowering date in both seasons. Using planting in 20th May produced the greatest values in the both seasons. Plant density was significantly effected on Flowering date in the both seasons. Using 175.000 plant/fed. gave greatest values in the both seasons. Soybean genotypes had a significant effect on Flowering date in both seasons. Using H2F12 genotype had gave the highest Flowering date in both seasons.
The interaction between planting dates and plant density (A x B), planting dates and soybean genotypes (A x C), plant density and soybean genotypes (BXC) and The interactions (A x B x C) had a significant effect on the days to50% flowering in both seasons. In general, H2F12 genotype when sowing in 20 May with dense plant population 175.000 plant/fed recorded the maximum days to flowering in the both seasons.
2- Days to maturity:
Planting dates had a significant effect on days to maturity in the both seasons. Planting dates had a significant effect on Flowering date in both seasons. Using planting in 20th May produced the greatest values in the both seasons. Plant density was significantly effected on Flowering date in the both seasons.Using planting in 1 May produced the greatest values in the both seasons also, Plant density was significantly affected on days to maturity in both seasons using 175.000 plant/fed. had the longest period in both seasons. Soybean genotypes had a significant effect on days to maturity in both seasons. using H2F12 genotype gave the highest values of maturity in both seasons.
The interaction between planting dates and plant density (A x B), planting dates and soybean genotypes (A x C), plant density and soybean genotypes (BXC) and The interactions (A x B x C) had a significant effect on the days to maturity in both seasons. In general, H2F12 genotype when grown under plant dense population 175.000plant/fed. In 1 May recorded the maximum days to maturity in both seasons.
3- Plant height (cm):
Planting dates had a significant effect on plant height in both seasons. Using planting in 1st May produced the greatest values, while the shortest plants were produced when using planting in 10th June in both seasons. also, Plant density were significantly affected on plant height in the both seasons. Using 175.000 plant/fed. gave the greatest values in the both seasons. Soybean genotypes had a significant effect on plant height in both seasons. Using H2F12 genotype gave the highest plant height in both seasons.
The interaction between planting dates and plant density (A x B),plant density and soybean genotypes (BXC) and The interactions (A x B x C) had a significant effect on the plant height in both seasons but The interaction between planting dates and soybean genotypes (A x C) had a significant effect on the plant height in the first season only. In general, Giza111 genotype when sowing in 1st May with dense plant population 175.000 plant/fed recorded the maximum plant height in both seasons.
B – Yield and yield components:
1- No. of branches/plant
Planting dates had a significant effect on No. of branches/plant in both seasons. Using planting date in20 May produced the greatest values in both seasons. also, Plant density was significantly affected on No. of branches/plant in both seasons. the highest values of No. of branches/plant produced by 105.000 plant/fed. On the other hand, soybean genotypes had a significant effect on No. of branches/plant in both seasons. Using Giza111 gave the highest values in both seasons.
The interaction between planting dates and plant density (A x B), planting dates (A) and soybean genotypes (C) and the interactions (A x B x C) had a significant effect on the No. of branches/plant in the first season only. While the interaction between plant density and soybean genotypes had a significant effect on the both seasons. In general, in the first season only the maximum value of No. of branches/plant (4.4) was recorded from Giza111 genotype when sowing in 20 May with 105.000plant/fed. in the first season.
2- Number of pods/plant:
Planting dates had a significant effect on number of pods/plant in both seasons. Using planting in 20 May produced the greatest values in both seasons. also, Plant density was significantly affected on No. of pods/plant in the both seasons. At these mentioned ages the highest values of No. of pods/plant produced by 105.000plant/fed. in both seasons. Soybean genotypes had a significant effect on No. of pods/plant in both seasons. using H2F12 gave the highest No. of pods/plant in both seasons.
The interactions, planting dates and dens plant population (A x B), plant density with soybean genotypes(AXB) and interactions (A x B x C) had significant effect on the No. of pods/plant in the first season. While the interaction between planting dates(A) and soybean genotypes (C) had insignificant effect on No. of pods/plant in both season. In general, the maximum values of No. of pods/plant when H2F12 genotype sowing in 20 May with 105.000 plant/fed in the first season.
3- The number of seeds/plant;
planting dates had a significant effect on No. of seeds/plant in both seasons. Using planting in 20 May produced the greatest values in both seasons. also, Plant density was significantly affected on No. of seeds/plant in both season. The highest values of No. of seeds/plant produced by 105.000plant/fed. in both seasons. Soybean genotypes had a significant effect on No. of seeds/plant in both seasons. using Giza111 genotype gave the highest of No. of seeds/plant in both seasons.
The interaction between planting dates and plant density (A x B), planting dates (A) and soybean genotypes (C) and The interactions (A x B x C) had a significant effect on the No. of seeds/plant in both seasons. While the interaction plant density (B) and genotypes (C) a significant effect on the No. of seeds/plant in the first season only. In general, the maximum values of No. of seeds/plant when H30 genotype sowing in 20 May with plant dense population 105.000plant/fed.
4- 100-seeds weight (gm)
planting dates had a significant effect on 100-seeds weight (gm) in both seasons. Planting in 20 May produced the greatest values in both seasons. also, Plant density was significantly affected on 100-seeds weight (gm) in the both seasons. the highest values of 100-seeds weight (gm) produced by plant dense 175.000 plant/fed. in both seasons. soybean genotypes had a significant effect on 100-seeds weight (gm) in both seasons. using H30 genotype gave the highest of 100-seeds weight (gm) in both seasons.
The interaction between planting dates and plant density (A x B) had a significant effect on the 100-seeds weight (gm) in the both season. While The interaction between planting dates (A) and soybean genotypes(C), the interaction between plant density(B) with soybean genotypes(C) and the interactions (AXBXC) had a significant effect on the 1000-grain weight (gm) in the first season only. The maximum value of 100-seeds weight were recorded from H30 genotype sowing in 20th May with 140.000plant/fed. in the first season.
5- Seeds weight/ plant (gm):
planting dates had a significant effect on seeds weight/plant in the both seasons. Using planting date in 20th May had produced the greatest values. also, Plant density was significantly affected on seeds weight/plant in the both seasons. The highest values of seeds weight/plant produced by 175.000plant/fed. Soybean genotypes had significant effect on seeds weight/plant in both seasons. Using H117 genotype gave the highest seeds weight/plant.
The interactions between planting dates and plant density (A x B), plant density with soybean genotypes, planting dates (A) soybean genotypes (c) and the interactions (AxBxC) had significant effect on the seeds weight/plant in the both seasons. Generally planting in 20th May with 175.000plant/fed with H117 genotype in the first season and H2F12 in the second season.
6- Biological yield (kg/fed.):
planting dates had a significant effect on biological yield (kg/fed.) in the both seasons. planting in 20th May had produced the greatest values in both seasons. also, Plant density was significantly affected on biological yield in the both seasons. The highest values of biological yield produced with 175.000plant/fed. in both seasons. Soybean genotypes had a significant effect on biological yield in both seasons. Using Giza111 genotype gave the highest of biological yield in both seasons.
The interaction between planting dates and plant density (A x B) and the interaction between plant density and genotypes had significant on biological yield in both seasons. While the interaction between planting dates and genotypes (AXC) and the interactions(A x B x C) had significant on biological yield in the second season only. In general, the maximum value of biological yield was recorded from Giza111genotype with planting in 20th May with 175.000 plant/fed. in the second season only.
7- Straw yield (kg/fed.):
planting dates had significant effect on the straw yield (kg/fed.)in the both seasons. Using planting in 1st May produced the greatest values in both seasons. also, Plant density was significantly affected on straw yield in the both seasons. The highest values of straw yield produced with 105.000plant/fed. in both seasons. Soybean genotypes had significant effect on straw yield in the second season only. The results pointed that using H30 genotype gave the highest of straw yield.
The interaction between planting dates and plant density (A x B) and the interaction between planting dates (A) and soybean genotypes (c) had a significant effect on the straw yield in both seasons. while the interaction between plant density with soybean genotypes and the interactions (A x B x C) had significant effect on the straw yield in the second season only. In general, the maximum straw yield were obtained from the H30 genotype when planting in 1st May with highest plant density 175.000 plant/fed.
8-Seeds yield (kg/fed.)
planting dates had a significant effect on the seeds yield (kg/fed.) in the both seasons. Using planting in 20th May had produced the greatest values in both seasons. also, Plant density was significantly affected on seeds yield (kg/fed.) in the both seasons. As the highest values of seeds yield (kg/fed.) produced by 175.000 plant/fed. soybean genotypes had a significant effect on seeds yield (kg/fed.) in both seasons. Using Giza111 genotype gave the highest of seeds yield in both seasons.
The interactions between planting dates and plant density (A x B), planting dates (A) and soybean genotypes (C), plant density and genotypes and the interactions (A x B x C) had significant effect on the seeds yield in both seasons. In general, using Giza111 genotype when sowing in 20th May with 175.000 plant/fed. give the highest values in the first and the second season respectively.
Seeds quality:
1- protein percentage(%)
planting dates had a significant effect on the protein percentage (%) in both seasons. Using planting in 20th May produced the greatest values in the both seasons. also, Plant density was significantly affected on protein (%) in the both seasons. The highest values of protein (%) produced with 175.000 plant/fed. in both seasons. soybean genotypes had a significant effect on protein (%) in both seasons. Using Giza111 genotype gave the highest of protein (%) in both seasons.
The interactions between planting dates and plant density (A x B), planting dates (A) and genotypes (C), plant density and soybean genotypes (BXC) and the interactions (A x B x C) had significant effect on protein percentage in both seasons. In general, Giza111 genotype when sowing in 20th May with using plant dense population 175.000 plant/fed. recorded the maximum values in the first and the second season respectively.
2- Seed Oil content (%)
planting dates had a significant effect on the seed oil content (%) in both seasons. Using planting in 10th June produced the greatest values in both seasons. also, Plant density was significantly affected on seed oil content (%) was significant at harvest in the both seasons. As mentioned the highest values of oil (%) produced with 105.000 plant/fed. in both seasons. soybean genotypes had a significant effect on seed oil content (%) in both seasons. Using H30 genotype gave the highest of seed oil content (%) in both seasons.
The interactions between planting dates and plant density (A x B) and the interaction between plant density and soybean genotypes (BXC) had significant effect on seed oil content (%) in the first season only. While the interaction between planting dates (A) and genotypes (C) and the interactions (A x B x C) had significant effect on seed oil content (%) in both seasons. In general, H30 genotype when sowing in 10th seeds yield (kg/fed.) June with using plant dense population 105.000 plant/fed. recorded the maximum values in the first and the second season respectively.