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High maize yields can only be achieved on fertile, loose and well-permeable soils. Previous research indicates that novel maize hybrids respond favorably to higher crop density. The aim of this study was to investigate the influence of meteorological conditions, soil type and seeding density on cob length, number of grain rows on the cob, number of sterile plants, grain yield and grain water content of the maize hybrid AS 6E02 (FAO 620) during the growing season. The tests were carried out during 2017 and 2018 through field micro-experiments in the agroecological conditions of the Vranje municipality using the split-plot design with four replications on eutric cambisol, vertisol and alluvium soils. The area of the plot for grain yield was 8.4 m2 . The agronomic practices used in the experiment were standard, as for regular maize production. The years in which the surveys were conducted differed in terms of meteorological conditions, the amount and distribution of precipitation. The smallest average cob length (17.6 cm) for all investigated soils and years was obtained with the narrow-row sowing. The number of grain rows did not vary significantly depending on the sowing density. On a two-year average, the grain yield was significantly higher, influenced by the type of soil in relation to the sowing density. On average for soil types and years, the lowest percentage of sterile plants (1.90%) was found at the sowing density of 75.187 plants per ha. In comparison to 2017, the water content was higher by 8.5 index points in 2018.

Recommended agrotechnical measure that is performed immediately before sowing of soybean is the inoculation of grain with nitrogen-fixing bacteria. The purpose of the experiment was to examine the influence of inoculation and variety on morphological characteristics, yield and content of primary grain metabolites. Three domestic soybean cultivars (Apollo, Gorštak and Trijumf) were examined on the plot on which soybeans were previously grown, on chernozem-type land, at the experimental field of the Tamiš Pancevo Institute. The following morphological characteristics and yield parameters were studied: plant height, number of side branches, number of nodes, plant height to the first pod, number of pods per plant, the mass of pods per grain per plant, grain weight per plant and grain yield per hectare. The content of oil, nitrogen and protein was determined by standard analytical methods. Inoculation had a statistically significant effect on the morphological trait of plant height up to the first pod, while inoculation had no statistically significant impact on other morphological traits and yield parameters. Inoculation did not have a statistically significant effect on oil, nitrogen and protein content. For most of the examined parameters, the effect of genotype was observed. The average yield of plants of inoculated seed (1250 kg ha-1) and non-inoculated seed (1230 kg ha-1) was far lower than the multi-year average, due to significantly lower precipitation compared to the multi-year average and high average air temperatures during the growing season.