The influence of various phytoameliorants on the fertility of agrogene soils of Primorye territory

The results of researches of influence of various phytoameliorants (alfalfa variable, limestone rind, timothy grass, clover meadow) and their grass mix-tures (timothy grass + clover, rumpus + alfalfa) on physical and chemical properties, indicators of hu-mus state and microflora of agrogene soils of Primorye Territory are given in the study. It has been established that for acidic soils under phytomeliorative conditions, acidic (pH) and medi-um-acid (pHc) reactions of medium, significant hy-drolytic acidity, very low content of mobile forms of phosphorus and considerable variability in the con-tent of exchangeable potassium (from significant to low) are characteristic. This necessitates the use of phosphorus and in case of the lack of potassium, in variants with crops of rumpus, clover, timothy grass + clover, i.e. potassium fertilizers. The application of phytoameliorants has positive impact on humus condition of soils. The contents and stocks of hu-mus increase. Humus formation mainly proceeds according to humate-fulvate type. In variants with sowing timothy grass and grass mixtures (timothy + clover), with the greatest number of ammonifying bacteria, the increase in the ratio of CHA/CFA, the degree of humification of organic matter was estab-lished. Positive affect of phytomeliorants on the microflora of agrogenic soils was determined. The biogeneity of soils was increasing and the content of oligonitrophils in soil microflora (lucerne, clover, rump) was increasing, which indicates actively de-veloped process of nitrogen cycling. In these vari-ants, higher level of catalase activity of soils was also established. Low values of the ratio of fungi and actinomycetes in the horizon PU with phytomeliorant crops showed the increase in the level of their cultivation. Based on the change in the parameters of humus state and soil microflora, the most effective phytomeliorants, positively influenc-ing the fertility of agrogenic soils, were the crops of leguminous grasses (alfalfa, rump) and their grass mixtures (rumpus + alfalfa, timothy grass + clover).