The efficiency of effect and after-effect of phosphoritic flour on chernozem lixivious

Acute shortage of single phosphorus fertilizers in agriculture and low availability of soil with mobile phosphates dictate the need to study the effectiveness of water insoluble phosphorus fertilizers based on local agricultural ore - phosphate flour. This fertilizer in its pure form is not recommended for using on chernozem soils characterized by a neutral or close to neutral reaction. It is effective only on sour soils. Based on the materials of field production experiments, the effectiveness of introducing phosphorus flour on leached chernozem of the Chulym-Yenisei Natural District was established. Positive effect and aftereffect of this fertilizer on improving the complex of agrochemical properties of the soil, nutrition conditions and productivity of spring wheat for three years were revealed. A significant increase in the availability of soil with mobile phosphates was recorded, as well as the optimization of plant nutrition with nitrogen and phosphorus when phosphate flour was added according to the results of cell and chemical plant diagnostics. The closest correlation between the content of mobile phosphates and wheat yield per year of fertilizer application was recorded before harvesting the crop in the phase of full ripeness, associated with the prolongation of the period of dissolution of phosphate flour. With the aftereffect of fertilizer, the strongest relationship between the indicators was observed in the most critical phase of growing season, the entry into the tube due to the active absorption of this element by the plants. Between the yield of spring wheat and the content of nitrate nitrogen in the soil average correlation dependence was obtained. The efficiency of phosphate flour was higher in all the indicators in the crop rotation "occupied fallow - wheat - wheat - pure fallow" compared to not fertilized "pure fallow - wheat -wheat - pure fallow ".