Yield and fodder value of pierced leaf sylphia on the reclaimed lands of the non-chernozem zone

 Relevance. The article is devoted to the actual problem of studying non-traditional fodder crop — pierced leaf sylphia (Silphium perfoliatum), which is promising for introduction on reclaimed lands of the non-chernozem zone  of the Russian Federation.

Methods and results. The research was carried out at the test site of the All-Russian Research Institute of Reclaimed Lands — a branch of the Federal Research Centre “Soil Science Institute named after V.V. Dokuchaev”(Tver region). The experiments were carried out in 2017–2020. Soil on the experimental site isdrained soddy-podzolic loamy soil. The arable layer is characterized by the following agrochemical indicators: pHKCL — 6.7, the content of easily hydrolyzable nitrogen — 50.1 mg/kg of soil, mobile phosphorus (P2O5) — 272.0 mg/kg of soil, and the concentration of  exchangeable potassium (K2O) — 78,0 mg/kg of soil. When cultivated on the reclaimed lands of the Tver region, pierced leaf sylphia provided high yields of green mass — 73.0±2,7 t/ha or 13.1±0,8 t/ha of dry matter. The maximum height of the shoots of pierced leaf sylphia reaches during the flowering period, which, in the conditions of drained lands, begins 90–100 days from the beginning of spring regrowth, which indicates the late  maturity of this culture in the conditions of the non-chernozem zone. The flowering period is the best period for harvesting sylphs for animal feed, since it is at this time that one kilogram of green feed contains 0.12–0.15 feed units, 170 g of dry matter, 16.5 g of crude protein, 24 mg of carotene, 41 g of fiber, 4.5 g of calcium, 0.4 g of phosphorus, which corresponds to the zootechnical norms of animal feeding. The introduction of pierced-leaved sylphia into the system of feed production on reclaimed lands, including in a green conveyor, allows obtaining the maximum amount of nutrients per unit area, using innovative technologies for the cultivation of forage plants, increasing the quality of feed and the concentration of energy in 1 kg of dry matter to 10,0–10.5 MJ. 

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