الفهرس 
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Abstract
Seeds of tomato plant (Lycopersicon esculentum L.) hybrid K186 were sown on 24th and 28th of April 2017 and 2018. After one month at most when the seedlings reached the fourth true leaves, they were transplanted in the open field in a sandy soil private farm in the area of Borg Al-Arab, Alexandria governorate, Egypt. Potassium silicate (SiO2 25% - K2O 15%) was spread on the plants three times starting at 20 days after transplanting and with 20 days interval. Four spraying concentrations were applied namely 0.0 (control), 3.0, 4.0 and 5.0 cm3/l. During the preparation of the soil and before transplanting, four levels of compost were applied namely, 0.0 (control), 10, 20, and 30 m3/ fed.and mixed well with the upper 50 cm of soil.
The results of this experiment can be summarized as follows:
1. Vegetative characteristics:
• The plant length of tomato plants significantly affected by the Potassium silicate levels during the two experimental seasons.
• The length of plant significantly responded to the application of compost. Whereas, that plants which supplied with compost at rate of 30m3/ fed. resulted the tallest tomato plants, followed in descending order by that which received compost at rate of 20 m3/ fed.
• Under different potassium silicate levels supplying compost caused an enhancement in plant length compared with control treatments.
• The greatest leaves number per plant were obtained by application of potassium silicate at rate of 5 cm3/l.
• Supplying compost at rate of 30 m3 /fed. resulted the highestleaves number/ plant for 1st and 2nd seasons, followed in decreasing order by that plants which supplied by compost at rate of 20 m3 /fed.
• The highest leaves number was noticed with that plants which applied by potassium silicate as foliar spray at rate of 5 cm3/l and supplied compost at 30 m3/fed.
• The Branches number of tomato plants significantly affected by the Potassium silicate levels during the two experimental seasons.
• Branches numbersignificantly responded to the application of compost. Whereas, that plants which supplied with compost at rate of 30 m3/ fed.resulted the highestBranches number , followed in descending order by that which received compost at rate of 20 m3/ fed
The Branches number significantly affected by the interaction treatments. However, under different potassium silicate levels supplying compost caused an enhancement in Branches number compared with control treatments.
The greatest total chlorophyll contentwas obtained by application of potassium silicate at rate of 5 cm3/l.
Compost treatment caused a great increase in total chlorophyll contentif compared with control treatment. Moreover, with that material used, supplying compost at rate of 30 m3 /fed.
Total chlorophyll contentsignificantly affected by the interaction treatments.
The highesttotal chlorophyll content was noticed with that plants which applied by potassium silicate as foliar spray at rate of 5 cm3/l and supplied compost at 30 m3/fed.
Chemical characteristics:
the highest Zn content was recorded with the control (plants which irrigated by industrial waste water alone without Potassium silicate application).
Zn content significantly responded to the application of compost. Whereas, that plants which supplied with compost at rate of 30 m3/ fed.
Zn contentsignificantly affected by the interaction treatments. However, under different potassium silicate levels supplying compost caused decreased in Zn contentcompared with control treatments.
The highestMncontentwas recorded with the control (plants which irrigated by industrial waste water alone without Potassium silicate application).
Mncontentsignificantly responded to the application of compost. Whereas, that plants which supplied with compost at rate of 30 m3/ fed.
Under different potassium silicate levels supplying compost caused decreased in Mncontent compared with control treatments.
Pbcontentsignificantly responded to the application of compost.
The lowest Pbcontentwas noticed with that plants which applied by potassium silicate as foliar spray at rate of 5 cm3/l and supplied compost at 30 m3/fed.
The highestNicontentwas recorded with the control (plants which irrigated by industrial waste water alone without Potassium silicate application).
Plants which no treated by any treatment(control (gained the highestNicontent. These findings were true during both experimental seasons.
Under different potassium silicate levels supplying compost caused decreased in Nicontent compared with control treatments.
the highestCdcontentwas recorded with the control (plants which irrigated by industrial waste water alone without Potassium silicate application).
Cdcontentsignificantly responded to the application of compost.
The lowestCdcontentwas noticed with that plants which applied by potassium silicate as foliar spray at rate of 5 cm3/l and supplied compost at 30 m3/fed. On the opposite, occurred when using potassium silicate at rate of 0 cm3/l with no supplied by compost, in 1st and 2nd seasons.
Fruit characteristics:
1. Physical characteristics:
The greatest total fruits yieldwas obtained by application of potassium silicate at rate of 5 cm3/l.
Compost treatment caused a great increase in total fruits yieldif compared with control treatment.
Total fruits yieldsignificantly affected by the interaction treatments.
2. Chemical characteristics:
The highest Zn content was recorded with the control (plants which irrigated by industrial waste water alone without Potassium silicate application).
Zn content significantly responded to the application of compost.
Zn content significantly affected by the interaction treatments.
Mncontentof tomato fruits significantly affected by the Potassium silicate levels during the two experimental seasons.
Mncontentsignificantly responded to the application of compost. Whereas, that plants which supplied with compost at rate of 30 m3/ fed.
The lowestMncontentwas noticed with that plants which applied by potassium silicate as foliar spray at rate of 5 cm3/l and supplied compost at 30 m3/fed.
The highest Pb content was recorded with the control (plants which irrigated by industrial waste water alone without Potassium silicate application).
Pbcontentsignificantly responded to the application of compost. Whereas, that plants which supplied with compost at rate of 30 m3/ fed.
The lowestPbcontentwas noticed with that plants which applied by potassium silicate as foliar spray at rate of 5 cm3/l and supplied compost at 30 m3/fed.
The highestNicontentwas recorded with the control.
Nicontentsignificantly responded to the application of compost.
The lowestNicontentwas noticed with that plants which applied by potassium silicate as foliar spray at rate of 5 cm3/l and supplied compost at 30 m3/fed.
The highestCdcontentwas recorded with the control (plants which irrigated by industrial waste water alone without Potassium silicate application).
Cd content significantly responded to the application of compost. Whereas, that plants which supplied with compost at rate of 30 m3/ fed.
The lowestCdcontentwas noticed with that plants which applied by potassium silicate as foliar spray at rate of 5 cm3/l and supplied compost at 30 m3/fed.