The study was carried out in 2018 and 2019 in the southern forest-steppe area of the Omsk region. The soil of the experimental plot was chernozem-meadow, medium and heavy loamy. The crop rotation was as follows: ‘black’ fallow – spring wheat – spring wheat – spring wheat – barley, the forecrop was second wheat. It was a two-factor field trial, the area of the plots was 50 and 25 m2, with three-fold sequence. The purpose of the current work was to estimate the effect of nitrogen fertilizer as a basic one and in the form of top dressing combined with fungicidal and herbicidal treatment on the productivity of spring wheat grain. There was identified a positive effect of the factor of nitrogen fertilization N35 on the productivity of spring wheat grain when sown in ‘black’ fallow. In 2018 there was productivity increase on 0.43, and in 2019 it was 0.74 t/ha, or 25.1 and 39.2%, respectively, according to the control. The utilization of the mixture of herbicides and carbamide (5 kg/ha) had only a tendency to productivity increase in comparison with herbicide control. The additional top dressing of 5 and 10 kg/ha of carbamide in ‘head formation period’ increased productivity by 0.32 and 0.42 (in 2018) and 0.45 and 0.47 t/ha (in 2019). The best results were obtained from the combination ‘herbicides + carbamide (tillering) + fungicide (head formation)’, the average productivity increase was 0.60 (in 2018) and 1.83 t/ha (in 2019).
The effect of nitrogen fertilizers and their tank mixtures with herbicides and fungicides on spring wheat productivity
