Zelendin Y. Cultural practices and of the resource-saving technology for bulb onion growing in the left bank Forest-steppe of Ukraine with irrigation

Object: regularities of high level of the yield and quality of bulb onion forming. Aim: increase of the yield and produce quality, rise of production profitableness and cutting of production costs. Methods: visual, measuring, gravimetric, chemical, statistical, calculation ones. Novelty: determined predecessors, ascertained economic treshold of harmfulsness and critical period of weediness of onion sowings by rose sonchus (Cirsium arvense L.), studied the efficiency of fluid drilling of germinated seeds. The structure of bulb onion plants root system is investigated with different methods of irrigation. Correlation connection is determined between the yield and water consumption and coefficients of use photosynthetic active radiation. The optimum area of nutrition for bulb onion plants is determined under conditions of drop irrigation. There have been ascertained the content and bearing out of elements of nutrition depending on methods of irrigation and fertilization. Economic efficiency is calculated and bioenergetic evaluation of the investigated modes and elements of the technology is given in comparison with the standard ones. Results: there have been worked out the resourse-saving elements of the technology for bulb onion growing, which allow to reduce the expenses of seed by 58%, fertilizers – by 50%, irrigated water – by 27% and with this to get profit is 16919 Hr/ha, the cost price of the produce is 0,83 Hr/kg, the profitableness is 79,9%, the coefficient of bioenergetic efficiency is 4,31. Degree of introduction: extent: agricultural enterprises of different forms of property of Kharkiv region. Sphere of use: vegetable growing.