Fractional Composition of Mineral Phosphates of PodzolicChernozem after Long-Term Application of Fertilizers in Field Crop Rotation

Phosphorus content in the soil, features of profile distribution, proportion organic and mineral compounds other indicators characterize level soil fertility. Therefore, studies phosphate status different subtypes agrocenoses are relevant. The aim research was to study change fractional composition phosphates podzolicchernozem compared fallow land after application fertilizer systems field crop rotation Right Bank Forest-Steppe. Chang Jackson method Ginzburg-Lebedeva modification determined from a layer 0-20 cm with photocolorimetric determination phosphorus by Denigz modified Truog-Mayer. Studies have shown that podzolic heavy loam chernozem forest has significant reserves potentially available for plant nutrition. After 55 years rotation, depending on characteristics fertilizer, its changed 0.09% 0.27% P2O5 (with under 0.10%). Under influence natural anthropogenic factors is transformation regrouping fractions phosphorus. In this case, sparingly soluble can be converted into active forms become Fertilizers significantly poured gross content. y 67-69% 61-62% system. main share loamed represented Ca-P calcium phosphates, which genetic subtype. According fraction cm, it presented following series: Са-РІІ>Са-РІІІ>Са-РІ>Fe-P>Al-P. increased applying fertilizers