الفهرس 
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Abstract
Field experiment was carried out during 2020 and 2021 seasons at the Agricultural Research Station Experimental Farm in Shandaweel Island, Sohag Governorate to evaluate the effect of foliar spray by salicylic acid on the yield and its attributes of intercropped soybean with sorghum. Sowing sorghum (Var. Dorado) was done on 11th and 12th of June in 2020 and 2021 seasons, respectively. While planting soybean (Var. Giza-111) was done on 14th and 15th of June in 2020 and 2021 seasons, respectively. The experiment was carried out in a randomized complete block design (RCBD) using strip plot arrangement with three replications. The first variable was the foliar sprays compounds which occupied horizontally as follows:
A - Control.
B- Salicylic acid 50 ppm.
C-Salicylic acid 100 ppm.
The second variable was intercropping system treatments which consisted of:
1- 1 Sorghum: 1 Soybean.
2- 2 Sorghum: 2 Soybean.
3- 2 Sorghum: 1 Soybean.
4- 1 Sorghum: 2 Soybean.
5- 3 Sorghum: 1 Soybean.
6- 2 Sorghum: 4 Soybean.
7- Sole Sorghum.
8- Sole Soybean.
The results obtained from experiments are summarized in the following:
1- Sorghum yield and its attributes traits: 1- Days to heading (day):
The presented data reveal that the interaction was highly significantfor days to heading in the second season and significant in the first season in favor of spray by 100 ppm salicylic with intercropping system 3sorghum :1 soybean.
2- Plant height (cm):
The obtained results show that the interaction had a highly significant influence on plant height in the both seasons in favor of sprayed by 100 ppm salicylic with intercropping system 3sorghum :1 soybean.
3- Panicle length (cm):
Sprayed plants by 100 ppm salicylic with intercropping system 3sorghum:1 soybean gained the maximum mean values of panicle length.
4- Panicle width (cm):
Data presented here show that the interaction had a highly significant effect on panicle width in the second season and no-significantin the first season. In addition, the highest mean values of panicle width obtained from sprayed by 100 ppm salicylic with intercropping system 3 sorghum :1 soybean.
5- Panicle weight (g):
The interaction were highly significant for panicle weight in the second season and no-significant in the first season in favor to spray by 100 ppm salicylic with intercropping system 3 sorghum :1 soybean.
6- Panicle grain weight (g):
Data exhibited reveal that the interaction had a highly significant effect on panicle length in the both seasons in favor to spray by 100 ppm
salicylic with intercropping system 3 sorghum :1 soybean.
7- 1000- grain weight (g):
The obtained results revealed that the interaction had a significant impact on 1000- grain weight in the both seasons . Sprayed plants by 100 ppm salicylic with intercropping systems 3sorghum :1 soybean and 2 sorghum :1 soybean gained the maximum mean values in this respect.
8- Grain yield (kg/fed.):
The obtained results revealed that the interaction had a highly significant influence on the grain yield in the both seasons in favor of sprayed by 100 ppm salicylic with intercropping system 3sorghum :1 soybean.
9- Grains protein content (%):
The presented data in this respect show that the interaction was significant for grain protein in the second season and no-significant in the first season. Thus, sprayed plants by 100 ppm with intercropping system
3 sorghum:1 soybean gained that maximum average values in this respect.
10- Fodder yield (kg/fed.):
The obtained results denote that the interaction had a significant effect on fodder yield in the both seasons in favor to spray by 100 ppm salicylic acid with intercropping system 3 sorghum: 1 soybean.
2- Soybean Yield and its attributes: 1- Plant height (cm):
The obtained result revealed that the interaction between salicylic acid concentration and intercropping system had a significant effect on soybean plant height in the tow growing season in favor of sprayed by 100 ppm salicylic acid with intercropping system 4 soybean:2 sorghum.
2- Number of branches/plant:
The obtained results denote that the interaction between salicylic
acid concentration and intercropping system had a significant effect on soybean number of branches/plant in the first season and no-significant in the second season in favor to spray by 100 ppm salicylic acid with intercropping system 4 soybean :2 sorghum in the second season.
3- Number of pods/plant:
The obtained data reveal that the interaction between salicylic acid concentration and intercropping system had a significant effect on soybean number of pods/plant in the tow growing season. Sprayed by 100 ppm salicylic acid with intercropping system 4 soybean :2 sorghum recorded the maximum mean values in this respect.
4- Number of seeds/pod:
Data exhibited reveal that the tested salicylic acid concentration had a significant (p≤0.05) effect on number of seeds/pod soybean plants in both seasons. Thus, the highest mean values of number of seeds/pod in both seasons were recorded from soybean plants which were sprayed by foliar spray 100 ppm salicylic acid. Moreover, the illustrated data focus that the tested intercropping systems had a significant influence on the number of seeds/pod of soybean in the two growing seasons. Sowing soybean plant as sole produce the maximum mean values of number of seeds/pod in both seasons. Here too, the interaction between salicylic acid concentration and intercropping system had no significant effect on soybean number of seeds/pod in the tow growing season.
5- 100-seed weight (g):
The interaction between salicylic acid concentration and intercropping system had a significant effect on soybean 100-seed weight in the tow growing season in favor of 100 ppm with intercropping system 4 soybean :2 sorghum.
6- Seed yield/plant (g):
The interaction between salicylic acid concentration and intercropping
system had a significant effect on soybean seed yield/plant in the tow growing season in favor to 100 ppm with intercropping system 4 soybean
:2sorghum.
7- Seed yield/fed. (kg/fed.):
The obtained results show that the interaction between salicylic acid concentration and intercropping system had a significant effect on soybean seed yield/fed in the tow growing season in favor of 100 ppm with intercropping system 4 soybean :2 sorghum.
8- Seeds oil content (%):
The interaction between salicylic acid concentration and intercropping system had a significant effect on soybean seed oil in the tow growing seasons in favor to 100 ppm with intercropping system 4 soybean
:2 sorghum.
9- Seeds protein content (%):
The interaction between salicylic acid concentration and intercropping system had a significant effect on soybean seed protein in the tow growing season in favor of 100 ppm with intercropping system 4 soybean :2 sorghum.
10- Oil yield (kg/fed.):
The interaction between salicylic acid concentration and intercropping system had a significant effect on soybean oil yield (kg/fed) in the tow growing season in favor of 100 ppm with intercropping system4 soybean :2 sorghum.
11- Protein Yield (kg/fed.):
The interaction between salicylic acid concentration and intercropping system had a significant effect on soybean oil yield (kg/fed) in the tow growing season in favor to 100 ppm with intercropping system 4soybean:2sorghum.
3- Competitive relationships:
The greatest ratios of land equivalent (LER) which were 1.44 and
1.48 in the two respective seasons) were obtained from 2 sorghum: 2 soybean and 2 sorghum: 2 soybean intercropping systems under 100 ppm salicylic acid. A greater competitive ratio (CR) value of soybean (1.42) was recorded from intercropping system treatments of 2 sorghum: 2 soybean.Otherwise, the highest competitive ratio of sorghum (1.17) was gained from intercropping system treatments of 3 sorghum: 1 soybean. Thegreatest values of monetary advantage index 7500.75 and 12233.45 LE in the first and second seasons, respectively, from 2 sorghum: 4 soybean and 2 sorghum: 2 soybean intercropping systems under100ppmsalicylicacid.