The changes in productivity and agrochemical parameters of vertisol at different systems of soil tillage and fertilization in crop rotation
2008
Borisova, M. | Dimitrova, F.
The complex effect of system soil tillage and fertilization on the change in productivity of crops and come agrochemical parameters of soil is studied by long term field trial (1990-2005) carried out on a Vertisoil in Bojurishe, Sofia district. Two Vertisol and four levels of fertilizer application in a four-field crop rotation were tested. It is established that the changes in the content of basis nutrition soil components in rotation depend on the climatic conditions and the fertilization levels. At the end of crop rotation it is established a higher content of the basic nutrition elements in the soil. The uptake of nitrogen, phosphorus and potassium depend of the fertilization is more considerable compared to the soil tillage. The uptake is highest when increase the fertilization levels. The balance of basic nutrients elements under crop rotation is positive in different fertilization levels. The productivity in crop rotation is highest in optimal fertilization rate. The 25% reduction of the fertilizer rate decrease of the crop rotations productivity. The increase of fertilizing rate by 25% over the optimum does not practically increase the crop rotations productivity.
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