Demydas G. Agro technical substantiation and development of practices for the improvement of productivity of basic and intermediate feed crops in the Forest steppe zone of Ukraine

The object is feed crops in the system of obtaining two crops per year, dynamics of feed productivity due to agro phytocenosis composition, methods of growing and aftereffect; the aim to substantiate experimentally interaction of agro ecological and biological factors in the system of basic and intermediate feed crops growing technology, their species composition and feed productivity in the Forest-Steppe of Ukraine; the methods are general dialectic, general scientific (induction and deduction, analysis and synthesis, modeling and others) and special: field, bio morphological, physiological laboratory (chemical, agro physical; agrochemical and biochemical); statistical, comparative and calculating; the new approach lies in studying and theoretical substantiation of the basis of intermediate feed crops in the system of obtaining two feed crop yields per year in the Forest-Steppe of Ukraine including peculiarities of growth and development, photosynthesis, water and nutrition regime of soil, yield forming of single-species sowings and mixtures of feed crops, feed productivity, energy saving, technology methods, aftereffect for soil fertility following crops productivity as well as energy and economic efficacy; the results are that methods of high-productive agro phytocenosis of winter, intermediate, basis (after intermediate harvest), after harvest and intersown single-species and mixed type sowings of feed crops are developed and scientifically substantiated. Regularities are established and models of interaction of their biochemical composition, nutrition and methods of feed productivity increase and accumulation of total and exchangeable energy are developed. Aftereffect of intermediate and basis (after intermediate harvest) sowings on the balance of organic matter and nutrition regime of soil, productivity of the following crops are investigated; all the thesis has been developed at the agricultural enterprises of Kiev and Chernigivska region; the field is agriculture