PRODUCTION POTENTIAL OF FEED BARLEY VARIETY VESLETS, GROWN IN THE SOUTH DOBRUDZHA REGION OF BULGARIA
The soil and climatic conditions of Dobrudzha region are favorable for the cultivation of cereal crops and the formation of higher yields compared to the other agro-ecological regions of Bulgaria. Barley is a traditional agricultural crop, ranks after wheat and maize and has an important role in the grain balance of our country. The proven stable and permanent barley yields ensure good harvest and make it a preferred crop with other cereals. Its productivity is determined by the genetic features of the variety and the growing conditions - meteorology and agro-technology. The production potential of the feed standard barley variety Veslets were investigated in an eight-year field experiment (2009-2016) carried out in the trial field of Dobrudzha Agricultural Institute-General Toshevo. The experiment was designed by the split plot method in 4 replications, the size of the trial plot being 12 m2 after four predecessors: rape, peas, sunflower and grain maize. The study included three levels of fertilization. The mineral fertilization was applied according to the type of previous crop. Fertilization with phosphorus and potassium was background (P6K6) and nitrogen fertilizer tested at the following rates: N6, N12 and N18 after rape, sunflower and grain maize (T), N3, N6 and N9 after peas (T), the check variant being N0P0K0 (O). The purpose of the research is to study the productivity of the feed standard barley variety Veslets over a longer period of time characterized by a variety of weather conditions at different fertilization rates. Meteorological conditions over the years have had a decisive impact on the productivity of feed barley. The long research period with the presence of a wide variety of weather conditions during the growing season of barley is a cause of formation of its different productivity. The most favorable combination of weather conditions during the 2013 season obtained the maximum yield of barley compared to other years. Mineral fertilization is a powerful factor that has a specific impact on the formation of feed barley. The effect of mineral fertilization on the productivity of barley is different and depends on its interaction with other agronomic factors and environmental conditions. Quite naturally, the lowest yields were obtained in control variants without fertilization (O). However, the effect of mineral fertilization in fertilizer variants (T) is different as a result of the interaction between the other agro-technical factors and the environment conditions. The effectiveness of mineral fertilization is most expressed during the 2015 season, when the increase in yields relative to control without fertilization is 52%.
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