Efficiency of crop rotation in applying organomineral fertilizers

By the systematic applying of phosphate fertilizer plants unused phosphorus is present in the soil in a reversible condition in the four pools and correspondingly it is available for plants in different amounts providing a long lasting effect in the aftereffect. Therefore a recurrent (in stock) application of phosphate fertilizers, taken into account that with the soil "overphosphating" this method loses the advantage compared with the annual, and the need for phosphorus fertilizers reduced, is justified. The scientific substantiation for the use of phosphate fertilizer on the northern border of black earth is associated with field experience "Enriching the soil by phosphates." In the long-term field stationary experiment of comparable forms of phosphate fertilizers in two crop rotations, superphosphate, with its reserve introduction in combination with manure and nitrogen-potassium fertilizers has provided the greatest - 19.2 t.z.e. / ha crop productivity, has increased the content of mobile phosphorus in the topsoil of 11.8 mg / kg, the lowest - 130 kg / ha increase in the cost of mobile phosphorus content of 1 mg / 100 g in the topsoil.