PRODUCTIVITY OF CROP ROTATIONS AND CHANGES AGROCHEMICAL PROPERTIES OF LOAMY SANDY SODDY-PODZOLIC SOIL UNDER LONG-TERM FERTILIZATION

Abstract

In a long term (1995-2010) stationary field experiment on a loamy sandy soddy-podzolic soil in three cycles of grain crop rotation, the effect of different levels of mineral fertilization on the productivity of agricultural crops and the agrochemical properties of soil was studied. It was found that the maximum crop productivity (8,2 t f.u./ha) was ensured at the average annual application of N90P40K89 in combination with 12,1 t/ha organic fertilizers. During the period of studies (14 years), the contents of mobile phosphorus and potassium forms (Kirsanov) increased in the treatment with the optimum productivity by 16 and 54 mg/kg soil, respectively, and the soil acidity increased by 0,68 pH units, the content of humus being remained stable. Keywords: productivity, crop rotation, fertility, loamy sandy soddy- podzolic soils, fertilizers.