Efficiency of fertilizers based on humic acids in watermelon cultivation on irrigated dark chestnut soils of Zavolzhye

Abstract

There was studied the effect of humic fertilizers on the productivity of watermelon F1 Karistan in Saratov Zavolzhye on irrigated dark chestnut soils in 2018-2019. The watermelon was cultivated using a plastic cover as well. Crops were treated three times during the growing season with aqueous solutions of products based on humic acids. The highest and most stable yield gains within the framework of the research (8.8 t / ha on average for three years) were obtained after the first treatment of crops with a solution of Reasil micro Hydro Mix with two treatment of Reasil Forte Carb-N-Humic. The gains in yield were obtained by increasing the number of fruit per plant and per unit area, as well as increasing the average weight of one fruit both at the first and second harvests. Humic fertilizers also positively affected the content of the sum of sugars and vitamin C in fruit. The content of nitrates was 2-3 times lower than the maximum permissible concentrations during all the years of research.