• • • Productivity of permanent farm grasslands and soil fertility as affected by various tillage practices
Productive longevity of grassland ecosystems has become of great significance, requiring studies of grass biology and response to farm practices. Productive longevity of perennial grasses significantly depends on plant nutrition, affected by rates and combinations of fertilizers. Experiment started in 1946 and is the part of research network on fertilization (registration number 146). The goal was to evaluate practices for grassland cultivation on various nutrition backgrounds. Seeding mixture was composed of common timothy (Phleum pretense), meadow fescue (Festuca pratensis), common foxtail (Alopecurus pratensis), smooth brome (Bromus inermis), bluegrass (Poa pratensis), red clover (Trifolium pretense) and white clover (Trifolium repens). Modifications of some cultivation techniques enabled forage production from 1.9 thousand feed units ha-1 under zero fertilization to 6.6 thousand feed units ha-1 — on the background of N180P45K120. Long-term farming of grasslands improved soil fertility due to sod formation. After 70 years increase in humus and nitrogen reached 13.3 t ha-1 and 584 kg ha-1, respectively. Mineral and organic fertilizers increased humus content in soil. Application of N180P45K120 and 20 t ha-1 of manure for 70 years enriched humus layer by 22 t ha-1 compared to the original value and 8.7 t ha-1 — compared to zero fertilization.
Source: http://kormoproizvodstvo.ru/en/9-2018-2/, p. 5
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