Effect of long-term fertilization on the content, fractional composition, and budget of humus in soddy-podzolic soils of the North-Eastern Europe | Влияние длительного применения удобрений на содержание, фракционный состав и баланс гумуса в дерново-подзолистых почвах европейского Северо-Востока
2009
Chebotarev, N.T. | Shmorgunov, G.T. | Kormanovskaya, V.M. | Ermolina, V.I., Research and Development, Design and Technology Inst. of Agroindustrial Complex of Komi Republic, Syktyvkar (Russian Federation) | Lapteva, E.M., Russian Academy of Sciences. Ural Branch, Syktyvkar (Russian Federation). Institute of Biology of Komi Science Centre
A stationary experiment was done in 1978-2007 in the Komi Republic. Tested area was sod-podzolic loamy medium cultivated soil. The crops were grown in a 6-field fodder crop rotation. Peat and dung compost was applied at a dose of 40 000 and 80 000 kg/ha respectively as an organic fertilizer and complete fertilizer (NPK) was done at rates calculated according a removal of nutrients by a planned harvest of the crops. Organic fertilizer at a dose of 40 000 kg/ha had the best effect on soil conditions and crop yield. It was used once every 3-4 years in conjunction with the annual application of NPK in the studied doses. In that case mineralization of root and crop residues of plants took place quicker increasing the reserves of humus in soil and improving its quality. This stimulated a growth of productivity and nutritive value of the agricultural products. As a result a harvest of dry mass of potato tubers was higher than in the control variant by 15-45%, an yield of annual grasses was higher by 45-48% and a harvest of dry compounds of grain grasses was higher by 107-120%.
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