Abstract
The study presents results of field experiments with maize conducted during the year 2020 on two fields with different soils in Bulgaria, namely Leached smolnitsa and Alluvial-meadow soil. This article aims to perform a simulation experiment of crop yields to evaluate the limits of maize grain yield grown on soils with different properties and with different levels of nutrients. The multifactorial experiments include the application of mineral fertilizers - ammonium nitrate, superphosphate, potassium sulfate and diatomic earth, containing respectively – nitrogen (N), phosphorus (P), potassium (K), and diatomic earth, which represents 89-95% silica in amorphous form) in a design that allows assessment of the actions and interactions of the four factors, varying on three levels. The simulation is preceded by an analysis of variance and regression analysis of the experimental data. Simulation is performed at medium levels of all nutrients and on concurrent levels of nutrients including the high level of two fertilizers excluding two others. The summary results show that the experimental and simulated maize yields on Leached smolnitsa in Bozhurishte are significantly lower than those on Alluvial-meadow soil in Tsalapitsa.
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