Italian rygrass의 파종비율과 다른 예취빈도가 초년도에 있어서 혼파초지의 수량 및 식생비율에 미치는 영향 ( The Effect of Different Seeding Rates of Italian ryegrass and Cutting Frequency on the Yield and Botanical Composition of Pasture Mixtures in the Firs

This experiment was carried out to determine the effects of different seeding rates of Italian ryegrass (Lolium multiflorum) and cutting frequency on the dry matter yield botanical composition of pasture mixtures in first harvest year. The experimental design was a split-plot design with three replication. The main plots were two seeding rates of Italian ryegrass at 0.3 and 1.0kg per 10a and the sub-plots were 3, 4, and 5 cutting frequency. The experiment was undertaken over a period 12 months from September 1981 to August 1982. The results obtained are summarized as follows: 1. The different seeding rates of Italian ryegrass had no effect on total day matter yield. 2. Over the experimental period, the total dry matter yield of pasture mixtures was increased with increasing the cutting frequency, but there was no significant. 3. It was found that dry matter yield of weeds clearly decreased with the high seeding rate of Italian ryegrass over the experimental period. 4. The high seeding rate of Italian ryegrass showed the trend toward the high yield of Italian ryegrass, and the low yield of orchardgrass and ladino clover. 5. At the early stage of the experiment, the botanical compositions of orchardgrass and ladino clover were decreased with the high seeding rate of Italian ryegrass. But at the final stage they were not influenced by the seeding rates of Italian ryegrass. From the above results it is suggested that the high seeding rate of Italian ryegrass give a good effect on the early forage yield and weed control, and the high cutting frequency maintain desirable botancial composition of orchardgrass and ladino clover in the pasture mixtures with Italian ryegrass.

본(本) 시험(試驗)은 혼파초지(混播草地)에 있어서 Italian ryegrass(Lolium multiflorum)의 파종비율(播種比率)과 예취빈도(刈取瀕度)가 첫번째 수확년도(收穫年度)의 목초(牧草) 총(總) 건물생산량(乾物生産量) 식생(植生) 구성비율(構成比率)에 미치는 영향(影響)을 구명(究明)하기 위(爲)하여 수행(遂行)되었다. Italian ryegrass의 파종량(播種量)을 10a 당(當) 0.3kg 및 1.0kg으로 하여 주구(主區)로 하였고 예취빈도(刈取頻度)를 년간(年間) 3, 4 및 5회(回)로 하여 세구(細區)로 한 분할구배치(分割區配置) 3반복(反復)으로 시험(試驗) 설계(設計)를 하였으며 1981년(年) 9월(月)부터 1982년(年) 8월(月)까지 12개월간(個月間) 시험(試驗)을 수행(遂行)하였던 결과 얻어진 성적을 요약(要約)하면 다음과 같다. 1. 혼파초지(混播草地)에 Italian ryegrass를 10a당(當) 0.3kg과 1.0kg을 조합(組合)했을때 수확(收穫) 첫 년도(年度)의 목초(牧草)의 총건물수량(總乾物收量) 0.3kg을 조합(組合)했을 때가 약간 높았으나 처리간(處理間)의 유의성(有意性)은 없었다. 2. 전(全) 시험기간(試驗期間)을 통(通)하여 목초(牧草)의 총(總) 건물수량(乾物收量)은 예취빈도(刈取頻度)를 자주 할수록 증가(增加) 되었으나 통계적(統計的) 유의성(有意性)은 없었다. 3. 잡초(雜草)의 발생(發生)은 Italian ryegrass를 10a 당(當) 1.0kg 파종(播種) 하였을때 현저히 감소 하였으며 초지조성시(草地造成時) 잡초발생(雜草發生) 억제에 Italian ryegrass의 파종(播種)이 유효하다고 사료(思料)된다. 4. Italian ryegrass의 총건물량(總乾物量)은 Italian ryegrass를 10a당(當) 1.0kg으로 파종(播種)하였을때 유의적(有意的)으로 높았고 orchardgrass와 ladino clover의 건물수량(乾物收量)은 다소(多少)낮았다. 5. 시험초기(試驗初期)에는 orchardgrass와 ladino clover의 식생구성비율(植生構成比率)이 Italian ryegrass의 파종량(播種量)이 높은 처리구(處理區)에서 감소(減少) 하였으나 시험(試驗) 종료시(終了時)에는 Italian ryegrass가 식생구성(植生構成) 비율(比率)에 큰 영향을 미치지 못하였다.