• • • Stability of white clover and alfalfa in grass ecosystems on long-term haylands and pastures
White clover proportion in yield varied within 10–41% in mixtures with perennial ryegrass while with cocksfoot it dropped down to 4–29%. Nitrogen fertilizers negatively affected clover stability, its content varied from 0 to 19%. Lack of K fertilizers resulted in drastically low concentration of exchange K in soil, reducing winter hardiness and leading to complete loss of cocksfoot and perennial ryegrass from stands. Tall fescue was the most stable species. Application of N180 increased grass productivity only by 26%, yield increase was 3.2–7.4 kg of dry matter (DM) per 1 kg of nitrogen. For 9 years productivity of domestic grasses averaged to 3.98–5.34 t DM ha-1, Dutch mixtures — 4.05–5.18 t ha-1. Under double or triple cutting alfalfa “Pastbishchnaya 88” and “Selena” maintained their productive longevity for 8–12 years, red clover — 2–3 years, common timothy— 4–5 years. Smooth brome dominated in grass mixtures for 23 years. Its proportion made up 51.4 and 36.6% under double and triple cutting, respectively. In the 22nd year white clover was observed in all the variants except for those under N fertilization. Triple cutting increased proportion of white clover. In mixtures with gramineous it made up 20.1–34.7%.
Source: https://kormoproizvodstvo.ru/en/11-2018-2/, p. 4
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