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The promotion during the last decades of the concept of sustainable agriculture attracted the application of principles that lead to agriculture technologies which are both technically and economically productive, providing effective solutions for protecting the environment and the consumers. They also insure the productivity of the factors involved and also an optimization of the production components. The goal of this research is to scientifically and economically substantiate the differentiated fertilization systems involved in obtaining high productions in the reference area. In this study it was track the effect of the nitrogen-phosphorous interaction in achieving the corn productions obtained in 2011. The research presents the stated results as annual (partial) values and as being reference values for further experimental years and obviously with approaches that will economically substantiate the suggested solutions. The current research is based on the production results obtained on corn crops (Turda STAR Variety) in long term experiments conducted on an argyle chernozem soil in Turda (Cluj County). The production data are obtained from these experiments, which hold objectives that target both the effect and economic efficiency of differentiated fertilizations on corn productions and also the impact of fertilizers on the soil fertility evolution, on the quality of the productions obtained. The field experience which underpins the achievement of objectives is a bi-factorial structure that tracks the effect of the NP interaction on corn. The rate of return, as a mean of all the values that derive from all nitrogen-phosphorous combinations was at a very high level, 80%, with a maximum of the individual values reached at the fertilizing combination N200P160, at which the value of the production increase due to the applied dose, reached the maximum value (6041kg/ha). The revenue obtained from the production increase for 1 leu spent was of 2,02 lei. In case of corn crops, especially Turda STAR hybrid and an intensive fertilization, it can be currently obtained 12-14 t grains of corn per hectare. Corn is not as sensitive as wheat, for example, to an imbalanced NP ratio and responds to this through high productions even for N overdoses, that can sustain high and economic corn grain productions per surface unit.

Economic Optimization of the Fertilization System on Corn Crops on a Representative Soil in the Transylvanian Plain