Abstract
The effects of drill widths and nitrogen application levels on the growth characteristics and seed productivity of Italian ryegrasss(Lolium multiflorum Lam.) were evaluated. The experimental design was a split-plot arrangement with three replications. The main-plots were three drill widths of 15, 30 and 45cm, and subplots were three nitrogen application rates of 50, 75 and 100 kg/㏊ in early spring. Among the growth characteristics, lodging tolerance appeared to be highest in the treatment including 45cm of drill width and 50kg/㏊ of nitrogen application compared to other treatments. The numbers of stem per one square meter tended to be increased more in drill width of 15cm than in that of 30 or 45cm, but other growth characteristics were similar among treatments. In seed yield components, the numbers of spike per one square meter were getting increased according as drill width was narrower, but spike length and 1,000 seed weight were longer and heavier. respectively. The rate of ripened pains was highest in treatment including 30cm of drill width and 50kg/㏊ of nitrogen application. Maximum seed yield was also obtained in same treatment.
이탈리안 라이그라스의 생육특성 및 종자 생산성을 조사하기 위하여 축산기술연구소 초지 사료과 시험포장에서 2000년부터 2001년까지 실시하였다. 시험구 배치는 휴폭(15, 30, 45cm) 및 이른 봄 질소시용량(50, 75, 100kg/㏊)을 조합한 분할 구배치 3반복으로 설계되었다. 생육특성 중에서 도복저항성은 휴폭이 45cm로 넓고 이른 봄 질소시용량이 50kg/㏊로 적을 때 높게 나타났고, 줄기의 수는 휴폭이 45cm 보다는 15 또는 30cm에서 많은 경향이었으며, 나머지 생육특성은 비슷하였다. 종자수량 구성요소에 있어서 단위면적당 이삭 수는 휴폭이 좁음에 따라서 많은 경향이었으나, 이삭의 길이와 1000립중은 휴폭이 넓음에 따라서 보다 길고 무거운 경향이었으며, 등숙율은 휴폭 30cm와 질소비료 50kg/㏊ 조합에서 가장 높았다. 또한 종자 수량은 휴폭 30cm와 이른 봄 질소시용량 50kg/㏊ 조합에서 가장 높은 수량을 나타내었다.
