Cropping system and fertilization regime as factors of maize grain quality

Maize cropping systems include continuous cropping (monoculture), which is one of the widespread systems in Serbia and in the world, as well as rotations which include rotation of crops of different species, enabling better control of diseases, pests and weeds, as well as better utilization of water and nutrients from soil, having as a consequence increased yields. When leguminous crop is prior to maize in rotations, the maize grain yields are much higher than in rotations when some other crops are prior to maize. The aim of experiment was to evaluate different cropping systems (maize monoculture (MM), maize-winter wheat rotation (M-W), maize-field pea rotation (M-P) and maize-field pea-winter wheat rotation (M-P-W)) and four fertilization regimes (control - without fertilization, N80P60K40, N120P90K60 and N160P120K80) on maize grain yield and grain quality (protein and oil content) during two meteorologically opposite years (2014 and 2015). The growing season and its interaction with cropping system and fertilization regime were the main factors that influenced significant variations in maize grain yield, protein and oil content. A double lower yield, slightly lower oil content and about 1/3 higher protein content were obtained in dry 2015, in relation to 2014, as a season with high precipitation level and lower average temperature. Rotation with higher crop number included (M-P-W rotation) expressed the highest impact on maize yield increase, together with protein and oil content in grain, particularly during stressful 2015. Similar trend was observed in two crop rotation, where legume crop is prior to maize. What is more, increased fertilization level was positively reflected on yielding potential and protein content increase, but it decreased oil content in grain. Poorer growth conditions, present in maize monoculture revealed lower grain yield and protein content, with greater oil content, particularly in treatment without fertilizer application.