Efficiency of Fertilization of Wheat (Tr. aestivum) under Changing Some Elements in Agrotechnics. Efficiency of Utilization of Nitrogen from Fertilizers

Zlatina Uhr, Elisaveta Vasileva

Abstract: This article reported results of a study whose objectives are to determine the extent of the impact of the combination predecessor – the nitrogen fertilizer rate on: The amount of grain yield; Growth and development of crops; Individual parameters and components of crop yield; The quality of grain and biomass yields; Reutilization effectiveness of carbon and nitrogen in the biomass; The use and reutilization of phosphorus, and Efficiency of nitrogen fertilizer for new and current Bulgarian winter wheat varieties. Of research in attempts factors most significant influence on grain yield is nitrogen fertilizer rate. The biggest impact on growth and development of the crop had its predecessor. Grain yield was positively correlated with parameters of crop density, total and productive tillering and height of plants that respond most positively by the introduction of legumes in crop rotation, and with the number and weight of grain in the class – determined by nitrogen fertilizer rate. The protein content was not affected by changing corn ancestor with legumes. In all varieties of crops in about 90% of the variance in grain protein due to nitrogen fertilization. The introduction of legumes increases the direct assimilation in the period after flowering, which is positively correlated with the yield of grain and grain protein. Phosphorus content varies slightly, but his reutilization – stronger by the genotype and nitrogen fertilizer rate. Following leguminous precursor efficiency of utilization of nitrogen from fertilizers decreased by over 30%.

Keywords: fertilizer rate; nitrogen fertilization; winter wheat

Date published: 2017-07-07