Effect of some anti-stress compounds on growth and production of tomato plants grown in winter season

This investigation was achieved at the two successive winter seasons of 2020 /2021 and 2021/2022 in the Experimental Station of the Hort. Dept., of Agric. Fac., Benha Univ. to examine the influence of anti-stress compounds, i.e., lithovit (0.5 g\ L), fulvic acid (1.0 g\ L) and potassium silicate (2.0 g\ L) as foliage spray on vegetative growth, nutrients content, yield and fruit quality for both hybrids,. i.e., Super gold and Super streen of tomato cultivars grown under low tunnels covered with mesh (65%). Results indicated that tomato plants derived from Super gold F 1 exceeded significantly those derived from Super streen in both seasons regarding plant height, leaves area, branches No., leaves No. and fresh as well as dry weight per plant, N, P, K percentages, total chlorophyll, total proline, fruit set, and consequently total yield with better quality of fruits regarding T.S.S. percentage, total yield, firmness and vit. C. In this respect foliar spraying Super gold F 1 cultivar by potassium silicate at 2 g/l three times started after 30 days from transplanting and every 15 days as intervals recorded the highest values of plant height, branches No. and leaves No., leaves area, fresh and dry weight per plant as well as N%, P%, K%, total chlorophyll and proline, fruit set, T.S.S., total yield, firmness and vit. C. in comparison with the other treatments. Contrarily, using Super streen and spraying with tap water recorded the least values of the aforementioned characters, meanwhile using fulvic acid at 1g/l or lithovit Co 2 at 0.5 g/l as foliar sprays on Super gold cultivar came in between in this respect during both seasons.