Studies on the Grassland management in Late-AuTumn and Early-spring VIII. Effect of nitrogen fertilization levelin early spring on growth , yield and nutritive value of grasses

월동전후 초지관리에 관한 연구 VIII. 이른 봄 질소시비수준이 목초의 생육과 수량 및 사료가치에 미치는 영향

A field experiment was carried out to determine the effects of nitrogen(N) fertilization levels(0, 30, 60, 90 and 120 kg/ha) in early spring on the growth, dry matter(DM) yield, seasonal distribution of production and nutritive value of grasses. Additional N after the first, second and third harvest were applied as 60, 60 and 30 kg/ha, equally in 1989. Grass growth and DM yield were significantly increased(p$NO_3$-N concentration was not affected by N level of early spring. It is suggested that, therefore, N application in early spring is essential, and 60 to 90 kg/ha of N application may be desirable in early spring.