Influence of the Crop Rotation and the Regime of Nutrition Level on the Content of Nitrogen, Phosphorus, Potassium and Raw Protein of Seeds in Winter Wheat Cultivated on the Preluvosoils in the Western Plain of Romania

The quality of production is related to a series of physical and chemical characteristics of plants which gives a positive mark to the applied agrotechnical methods for the correlation of the latter to the production obtained on the surface unit. A more intense accumulation of the biomass which determines an intensification of the photosynthesis positively influences the chemical composition of the final product – the grains. The total content of N (nitrogen) in the winter wheat grains was influenced by the crop rotation and the nutrition system. The raw protein content follows the natural way similarly to nitrogen total content being influenced mainly by the crop rotation and the regime of nutrition level. There weren’t observed any essential changes of the total P (phosphorus) and K (potassium) content under the influence of the crop rotation and the regime of nutrition level