[Intensity of balance of nutritive elements and crop rotation productivity on sod-podzol light loam and sandy loam soils]
2007
Lapa, V.V. | Bosak, V.N. | Ivakhnenko, N.N.,National Academy of Sciences. Scientific and Practical Center for Arable Farming (Belarus). Institute for Soil Science and Agrochemistry
Full organic and mineral fertilizer application into research on sod-podzol light loam and sandy loam soils in the basic types of field crop rotations (grain-grass ploughed, linen, grain ploughed, grain-grass) has provided the maximal efficiency of 62,5-105,3 c/ha f.u. at preservation of the basic agrochemical parameters of soil fertility. The increase from application of full mineral fertilizer into the best on efficiency variants has made 20,0-30,3 c/ha f.u., organic fertilizers - 7,9-10,8 c/ha f.u. at a recoupment of 1 kg NPK 8,5-10,0 f.u. On a background of recommended dozes of organic fertilizers the optimum level of mineral phosphoric fertilizers has made 60-70% from the general carrying out of phosphorus as for separate agricultural crops, and the basic types of crop rotations at intensity of balance for rotation of crop rotations within the limits of 100%. Phosphoric fertilizers application into such range has provided reproduction of the content of mobile phosphates in arable horizon of cultivated sod-podzol light loam and sandy loam soil. Preservation of the optimum content of potassium in soil on a background of recommended dozes of organic fertilizers was provided at mineral potash fertilizers application at a level of 100% of indemnification of potassium carrying out under grain and 50 % of indemnification of carrying out - under ploughed and forage crops. As a whole for a crop rotation potash fertilizers application is recommended at a level of 80% from the general potassium carrying out at intensity of potassium balance within the limits of 100% for rotation. At application of organo-mineral system of fertilizer (17,5 t/ha of manure + N105P40K90 and 12,0 t/ha of manure + N84P40K88) on the cultivated sod-podzol sandy soil in grai ploughed and grain-grass ploughed crop rotations the maximal efficiency of 61,4-87,5 c/ha f.u. was formed at preservation of agrochemical parameters of soil fertility. The increase from mineral fertilizers application has made 20,5-23,1 c/ha f.u. at a recoupment of 1 kg NPK 8,5-10,7 f.u. an increase from organic fertilizers application - 6,9-7,7 c/ha f.u. Depending on efficiency of crop rotations and soil fertility the recommended balances of nitrogen, phosphorus and potassium are offered
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