ABSTRACT
Abstract ................................................................................................. 383 20.1 Introduction ................................................................................ 384 20.2 Experimental Part ....................................................................... 385 20.3 Results and Discussion .............................................................. 386 20.4 Conclusion ................................................................................. 396 Keywords .............................................................................................. 397 References ............................................................................................. 397
ABSTRACT
The authors revealed new regularities of mobile phosphorus dynamics in the soils of different agroecosystems during prolonged systematic fertilizer application. They had shown that mobile phosphorus content in different soils increased only at the first rotations of field crop rotations. Later,
in spite of positive phosphorus balance the content of its mobile forms didn’t increase and even tended to decrease as a result of the transition of phosphorus in stiff state. In case of negative balance mobile phosphorus content in soils was recompensed through slow-moving phosphorus supply. Ecological balance at the agroecosystems was maintained due to these processes of phosphorus transformation. This equilibrium prevented losses of phosphorus due to surface and subsurface flows of the element for environment; so risks of eutrophication decreased. Also influence of phosphorous fertilizer on the biodiversity of soil microflora was ascertained. The mobile phosphorus dynamics in different soils, which was revealed during the prolonged field experiments, could be the model of phosphorous fertilizer transformation in condition of agricultural production.
