Results of the study of long-term dynamics of microbiological and agro-chemical indexes of the fertility of the meadow-sod soils with the use of fertilization systems of different intensity (Sakhalin Island)

A decrease of the level of basic elements of plant nutrition in soils regardless of the use of different fertilizer systems was established after the 30-year monitoring. The soil acidity had quite noticeable changes. Conservation of soil acidity indicators at the level of slightly acidic and close to neutral for 5 years was ensured by a calcium-organic complex. The fertilizer system of 200 t per ha of PMC (action and long-term aftereffect) + 2NPК contributed to the increase in the number of pedotrophic microflora in the soil, indicating an increase in the number of labile forms of organic matter involved in the synthesis of humus. The most favourable microbiological regime with balanced processes of nitrogen and humus transformation was formed when lime was combined with organic and mineral fertilizer systems (Ca + 20 or 40 t / ha of manure + 2NPK).