ABSTRACT
On sod-podzolic clay-loamy soil, with acidic and poor available forms of phosphates, the primary condition for increasing its fertility and fertilizer efficiency is the application of phosphorus fertilizers and liming. As the degree of soil culturality increased due to liming, and application of phosphorus fertilizers and manure, the order of nutrient minima changed. In first and second rotations of the seven-field crop rotation, phosphorus was in the first minimum for all crops; in the third rotation, the efficiency of certain types of fertilizers was equalized; and in the fourth rotation nitrogen and potassium came out in the first place, phosphorus took the third place.
