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Effect of organo-mineral fertilizer systems on the productivity of a cereal-fallow-row crop rotation and the fertility of southern chernozem in the arid Volga region

, : Effect of organo-mineral fertilizer systems on the productivity of a cereal-fallow-row crop rotation and the fertility of southern chernozem in the arid Volga region. Agrokhimiya ( 3): 48-59

In a long-term trial on heavy loamy southern chernozem in the Saratov district using a rotation of fallow/winter wheat/spring wheat/maize/spring wheat/barley, fertilizer treatments were (a) no fertilizers, (b) 20, 40 or 60 t FYM/ha applied to the fallow and no fertilizers to the other crops, (c) 20, 40 or 60 t FYM and/or 90 kg P2O5/ha applied to the fallow and 70 kg N to the 1st wheat crop, (d) 0, 20, 40 or 60 t FYM applied to the fallow, 40 kg N + 40 kg P2O5 to the 4th crop (spring wheat) and 30 kg N + 20 kg P2O5 to the 5th (barley) and (e) as (c) with NP as in (d). The highest cereal unit yields in 1982-88 were obtained with (e) or (d) at the highest FYM rate. Economically the most effective system was (d) with 20 t FYM/ha; this gave an average annual yield increase of 0.48 kg cereal units/ha and 7.0 cereal units/kg nutrients. The soil humus balance was positive when 40 t FYM/ha was applied, but this reduced fertilizer profitability. Effects on soil fertility are described.

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