The influence of organic fertilizers on the yield and quality of watermelons

Abstract

In connection with a decrease in soil fertility, it is necessary to revise the doses of mineral fertilizers when growing watermelons of the Shirin variety in the Tashkent region of Uzbekistan. It is also necessary to establish the doses of fertilizers that have a positive effect on the yield and quality of the products obtained. The research was carried out at the experimental base of the Research Institute of Vegetables - Melons and Potatoes, located in the Tashkent region. The soils where the studies were carried out are typical gray soils of old irrigation with a humus content in the upper 0-25 cm horizon of about 1%, in the lower 25-40 cm horizon - about 0,7%. Calcareous soil, in texture referring stay to the dark loam average at density. During the research, the previously recommended doses of fertilizers were taken for control. During the experiments, the doses of mineral and organic fertilizers were increased accordingly. Studies have shown that the highest yield of good quality watermelons was obtained when applying 25,0 t/ha of manure in combination with N₂₂₅ P₂₂₅ K₁₅₀  kg/ha and was equal to 21,2 t/ha, which is 37,7% higher than on the control variant (N₁₅₀ P₁₅₀ K₁₀₀  kg/ha) and had good biochemical indicators of product quality: sugars 8,11%, dry matter 9,1%, ascorbic acid 21,6 mg%, nitrogen nitrates 20,6 mg/kg, on the control these indicators were equal to 6,65%, 8,6%, 17,9 mg%,13.2 mg/kg, respectively.