[Dynamics and optimization of phosphate status of arable soils in Belarus in relation to level of agriculture intensification]
2008
Bogdevich, I.M. | Shmigelskaya, I.D. | Seraya, T.M. | Mikulich, V.A. | Tereshchenko, N.D. | Kalenik, G.I. | Adianova, O.B., National Academy of Sciences. Scientific and Practical Center for Arable Farming (Belarus). Institute for Soil Science and Agrochemistry
The new, higher limits of optimal levels of mobile P content in sod-podzolic soils for maximum crop yields had been proposed on the basis of the relevant information (2001-2007) obtained from the specially designed field experiments and from farmers fields. The analysis of changes of the mobile P contents of arable soils in the comparison to optimum parameters as well as to quantities of fertilizers applied in the regions and districts of Belarus are discussed. High degree of contrast in provision soils by phosphorus is established. As a whole, application of phosphoric fertilizers remains insufficient for essential increase of productivity of fields and maintenance of the reached level of the maintenance of mobile forms of phosphorus in soils. At present the average maintenance of P2O5 in arable soils makes 179 mg/kg, and in relation to 1992, it has decreased on 9 mg/kg. Disproportionate provision of soils of various granulometric structure by phosphorus in relation to optimum parameters is observed. Increase of content of phosphorus requires over 90% of the area of peat soils. Updating of doses of entering of phosphoric fertilizers towards increase on soils with high potential of fertility is necessary at simultaneous small restriction of doses of phosphorus on unproductive sandy soils
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