The paper is based on the researches carried out in a long term trial placed on the preluvosoil from Agricultural Research and Development Station Oradea belong the network of the National Agricultural Research and Development Institute Fundulea. Long term field experiments are important tools for examining the soil fertility and its influence on the yield level. The 16 variants (N0P0, N80P40, N80P80, N160P80 x K0, K40, K80, K120) in 4 repetitions were studied. The preluvosoil from North – West part of Romania is a medium provide with the main nutritive elements, with a weak acid reaction in the ploughing horizon. In the wheat importance in the panification industry is exclusive one and to obtain every year the big yield with good quality is very important for a region or a country. Oradea is included between the areas with very favorable conditions for wheat crop. The fertilizers sort, rates and time of application, determine the protein content and amino acids in plants. Although genetic potential is determined in function of species and variety, the protein quality and ratio between amino acids are variable and may be strong influenced by fertilization. The paper present research results obtained in long term experiments regarding the effect of potassium fertilizers applied on different NP background on winter wheat yield and quality in long term field experiment set up in 1974 at Agricultural Research and Development Station Oradea. The yield and gluten spores obtained are depending on the potassium rates applied and on the levels of NP backgrounds utilized. Potassium fertilizers have a significant influence on wheat yield. The best yield in preluvosoil conditions was obtained in the case of using N160P80K80 rates. The lower potassium rates (K40 and K80) influenced positive the dry gluten content of winter wheat. The best value of the dry gluten content in preluvosoil conditions was obtained in the variants fertilized with N160P80K80.

potassium fertilizers; wheat; yield; quality; preluvosoil

Presentation: oral