The effect of 50 years' application of organic and mineral fertilizer upon the fertility of podzolized chernozem in the central forest-steppe of the right-hand bank of the Ukrainian SSR. Part 1: The effect of systematic fertilizer application on the nutrient balance and organic matter of soil in a cereal-beet-vetch rotation

Martynovich, L.I.; Martynovich, N.N.

Agrokhimiya (1): 30-41


ISSN/ISBN: 0002-1881
Accession: 001970822

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Over 50 years observation of an 8-11 course rotation showed that where no fertilizers were applied, nutrient removal by crops was upto 4.6t/ha N, 2t/ha P2O5 and 4.9t/ha K2O. Systematic application of organic and mineral fertilizer, the latter at rates of N 468-629, P2O5 381-541, K2O 711-955 kg/ha over the rotation, increased nutrient removal by 27.8-42.3% N, 23.4-36.7% P2O5, and 31.1-48.8% K2O. However, respective deficits fell by 15-23, 61-84, and 27-39%, while utilisation coefficients rose, following increased input, from 52 to 68% (N), 25 to 37% (P2O5), 44 to 60% (K2O). Without fertilizers, the top 0-30 cm of soil lost 27.7% of initial organic matter and the 30-40 cm layer 17.3%, mainly in the first 16 years. Mineral fertilization increased total organic matter by 0.21%; combined application with organic inputs (7.7 t/ha FYM plus 60 kg/ha NPK) gave a 0.44% increase by the end of the study. However, average annual loss of organic matter still exceeded input, and a minimum organic input of 10 t/ha is advised. Systematic fertilization increased organic matter throughout the upper 1 metre of soil.