The current research is based on the production results obtained on wheat crops in long termexperiments conducted on an argyle phaeozem soil at SCA Turda. The goal of this research is toscientifically, agrochemically and economically substantiate the differentiated fertilization systemsinvolved in obtaining big productions in the reference area. In this study we tried to track the effect of thenitrogen-potassium interaction in achieving the productions obtained in 2012. The research presents thestated results as annual (partial) values and it will continue with them as being reference values forfurther experimental years (as stages in long term experiments) and obviously with approaches that willeconomically substantiate the suggested solutions. The production data are obtained from theseexperiments, framed in the “long term experiments system” from ASAS-ICDCPT Fundulea networkwhich hold objectives that target both the effect and efficiency of differentiated fertilizations onproductions and also the impact of fertilizers on the soil fertility evolution, on the quality of theproductions obtained.The degree of novelty of this study can be expressed through the fact that for thetype of soil and genotypes used in the experiments we can establish fertilization solutions and synthesizedmathematical models with a high dissemination and applicability value in similar ecologic conditions.The obtained results present the production levels obtained for wheat crops (Dumbrava kind) at twoalternatives for prior crops-corn and soy-statistically processed using variance and quadratic regression,as useful models for fertilization in the fertilization systems that were researched. It is obvious that at theend of these annual research the presented models will include the same objectives as in the prior yearsthat were studied. The already existing and further research will enrich the study’s utility in taking arational fertilization decision based in the future also on the support of the suggested solutions througheconomically efficiency calculations of these solutions. The presented data hold originality, according towhich the suggested solutions through fertilization models become important and present a real efficiencyin the fertilization practice and technologies applied to wheat crops.

productions, wheat crops, nitrogen-potassium interaction, experimantal years, fertilization systems

Presentation: oral