Abstract
Purpose. To study the effect of application of nitrogen fertilizers and defecation sludge on the fertility of grey forest soil and sugar beet productivity. Methods. Temporary field and analytical. Results. Research data on the efficiency of liming and mineral fertilizers in sugar beet cultivated on weakly acidic grey forest soil are presented. The complexity of the impact of agrochemical and reclamation measures on the physicochemical properties, the nutrient regime of grey forest soil and the productivity of sugar beet has been revealed. Conclusions. The best physical and chemical properties of the forest soil in the 0–10 cm layer were achieved with separate application of defecation sludge against the background of application of P90K90 and N90 and ploughing: рНsal of 6.58, Ng of 1.42 mg eq/100 g, the amount of absorbed alkali of 23.7 mg-eq/100 g of soil, and the degree of saturation with alkali of 94%. The stock of mobile phosphorus and potassium in the grey forest soil depended mainly on the application of mineral fertilizers. It slightly increased with the application of defecation sludge and did not depend on the technologies of its application. Application of N90P90K90 in ploughing increased the content of mobile phosphorus in the soil by 17 mg/kg and potassium by 20, with absolute values of 113 and 131 mg/kg of soil, respectively, compared to the control without fertilizers. The application of defecation sludge increased the content of mobile phosphorus in the soil compared to the background of mineral fertilizers by 5–8 mg/kg and mobile potassium by 4–8 mg/kg of soil. The highest biological productivity of sugar beet on the grey forest soil was achieved with the application of mineral fertilizers N90P90K90 and 6 t/ha of defecation sludge in autumn ploughing. The root yield was 51.6 t/ha, sugar content 16.6%, and sugar yield 8.57 t/ha.
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