Productivity of varieties of double-crop meadow clover against the background of mineral fertilizers in the subtaiga zone of Western Siberia

In the subtaiga zone of Western Siberia, meadow clover is important in providing livestock with high-protein feeds, the productivity of which largely depends on the variety and the level of mineral nutrition. The experimental work was carried out in 2021-2022 on the gray forest soil of the experimental field of the Department of Northern agriculture of the Federal State Budgetary Scientific Institution Omsk ASC in the taiga zone of the Omsk region. Three varieties (Tarsky local - control, Meteor and Prima) of meadow clover were studied against the background of mineral fertilizers. The purpose of the research is to establish the dependence of productivity of double-crop varieties of meadow clover on the level of mineral nutrition and identify the most promising ones for cultivation on forage in the subtaiga zone of Western Siberia. It has been established that along with the Tarsky local variety of meadow clover, which is widely cultivated in these conditions, Meteor and Prima are very promising double-crop varieties of Siberian breeding. They are characterized by good plasticity and winter hardiness, precocity, increased foliage of the feed mass, productivity and responsiveness to the applied mineral fertilizers. The highest yield of green mass for two cuttings is formed by the Meteor variety, from 60.9 t/ha under control to 68.5 t/ha when applying N30P150K180. The Prima variety has a yield of 13.9-23.3% less than the Meteor variety, but shows a higher responsiveness to mineral fertilizers. The increase in green mass to control from the application of N30P150K180 increases from 12.5% in the Meteor variety to 21.1% in the Prima variety, and per 1 kg of the active substance of fertilizers, respectively, from 21.1 to 28.9 kg. The control variety Tarsky local is inferior in yield of green mass to the Prima variety by 26.5-30.9%, and to the Meteor variety by 49.9-57.4%. Meadow clover is characterized by increased productivity when using mineral fertilizers in doses of N20P100K150 and N30P150K180. When applying N30P150K180, the collection of absolutely dry matter in the Meteor variety reaches 12.2 t/ha, feed units - 7.8 t/ha, digestible protein - 1.56 t/ha, ME - 111.7 GJ/ha, and in the Prima variety, respectively, 10.6; 6.79; 1.36 t/ha and 97.1 GJ/ha.