Zubkovska V. Features of phosphorus state of acid soils under different moisture conditions

Object - the change of the phosphate state and phosphate transformation processes in acidic soils at different moisture conditions. Purpose - to find the features of the phosphate regime formation, diagnosis and optimization of phosphate status in the acidic soils of different genesis, wetting and using conditions. Methods - field, laboratory and modeling, laboratory and analytical, statistical. Theoretical results -the theoretical analysis and solution of diagnostics and optimization problems of phosphate regime of soils with surface hydromorphism have been shown; new knowledge about the behavior of phosphate in the soils have been studied under the influence of moisture, fertilization and ameliorators. The accumulative migration phosphates ability of the studied soils was determined, the phosphate buffer parameters were shown as the criteria of their phosphate status optimization. The role of individual factors (redox potential, sesquioxides, particle size distribution, fertilizers and ameliorators) in the formation of the phosphate regime of soils and plant nutrient phosphate was determined. Practical results -a method of improved diagnosis and optimization of the phosphate status of the soil was placed out. The method is recommended to use the NU "Ukrainian Institute of soil protection" with the development of projects on fertility reproduction and chemical amelioration of acid soils with surface hydromorphism. The study received a patent for utility model "method of optimization of soil phosphate regime." Certain provisions of the thesis were included to the scientific and practical recommendations: "The methodology of assessment of environmental and reclamation condition of drained soils" and "Increase of fertility of acid and hydromorphic soils". Novelty - the character of phosphates forms in acid soils with surface hydromorphism (parameters of individual groups and factions relations) was shown for the first time; phosphate buffer parameters of soils of different genesis and use were set, which made it possible to improve a method of diagnosing of the phosphate status, the level of sustainability and ways of optimization; regularities of the surface hydromorphism, fertilizers and ameliorants influence , on the formation of the phosphate regime of soils were find; the gain of phosphate migration and accumulation processes in acid soils under the influence of surface hydromorphism, fertilizers and irrigation systems was identified. Degree of application - the thesis material are used in the educational process of preparation of masters KNAU named after V.V. Dokuchaev in the field of "Agricultural chemistry and soil science", "Expert evaluation of soil" in teaching the discipline "Soil protection and reproduction of soil fertility". The field is agriculture.