REDUCTION OF THE RISK POLLUTION USING ORGANIC AND INORGANIC ADDITION ON TOMATO CROP IRRIGATED BY INDUSTRIAL WASTEWATER

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