Abstract
This experiment was carried out to examine the effects of sowing method and summer management on the dry matter yield, dead matter, weed development and ground cover of orchardgrass (Dactylis glomerata L.) meadow. The experiment was allocated as a split-split plot design with three replications. The main plots were sowing method of drilling and broadcasting, sub plots were drainage of experimental field, adequate and inadequate, and sub-sub plots were cutting timeof orchardgrass, cutting before rainy season started and cutting after rainy season ended. The experiment was undertaken over a period of 14 months from September, 1983 to October, 1984. The results obtained are summarized as follows: 1. There were no significant differences in dry matter yield among treatments at the first cutting, but cutting before rainy season produced significantly more forage yield ($P{\le}0.01$) than cutting after rainy season at the second and third cuts. At the third cutting, drilled orchardgrass meadow showed a significant dry matter yield ($P{\le}0.05$) than broadcast orchardgrass meadow, 2. The dead matter of orchardgrass was accumulated only at the second cutting when orchardgrass meadow cut after rainy season. Orchardgrass produced in the adequate and inadequate drainage plots consisted 20.4 and 35.9% of dead material, respectively, but no significant difference was found between two drainage treatments. 3. Drilled orchardgrass meadow produced significantly less weeds ($P{\le}0.05$) than broadcast orchardgrass meadow, but the plots cut after rainy season produced significantly more weeds ($P{\le}0.01$) than the plots cut before rainy season. 4. The percent ground cover of orchardgrass in the plots cut before rainy season was significantly higher ($P{\le}0.01$) than that in the plots cut after rainy season at the second cutting. Drilled plots showed a slight increase in the ground cover than the broadcast, but the difference was not significant. The same trend of ground cover of the meadow estimated at the second cutting was sustained after the third cutting. 5. Based on the results of the experiment, it indicates that the second cut of orchardgrass should be made before rainy season related for maintaining high yield of the meadow. Drilling as a sowing method of orchardgrass meadow could be adopted in the view point of reducing weed development.
본 실험은 파종방법, 배수화도 및 여름철 예취관리가 오차드그라스 채초지의 목장건물수량, 고사물량, 초지의 잡초발생 및 피복율에 미치는 영향을 조사하기 위하여 심험설계는 주구를 조파와 산파로 하고 세구를 배수랑호구와 배수불랑구로 하였으며, 세세구는 장마전 예취구와 장마후 예취구를 두어 세세구 배치 3반후으로 하여 1983년 9월부터 1984년 10월까지 실시하였던바 얻어진 결과는 다음과 같다. 1. 초지의 목장건물수량은 1회 예취시에는 처리간에 차이가 없었으나 2회와 3회 예취시에는 장마전 예취구가 장마후 예취구에 비하여 수량이 높았고 ($P{\le}0.01$) 3회예취시에는 조파구가 산파구에 비하여 수량이 높았다. $P{\le}0.05$. 2. 목장의 고사물량은 2회예취시에만 발생하였는데 장마전 예취구에서는 발생하지 않았는데 반해 장마후 예취구에서는 배수랑호구와 배수불랑구에서 총 목장수량에 대하여 각각 24%와 35%의 고사물량이 발생하였다. 3. 잡초발생은 1회, 2회예취시에는 거의 없었으나 3회 예취시부터 다량발생하였는데 산파구가 조파구에 비하여 높았고 ($P{\le}0.05$) 장마후 예취구가 장마전 예취구에 비하여 월등이 높았다. $P{\le}0.01$. 4. 목장의 피복율은 1회 예취율에는 거의 100%로 차이가 없었으나 2회 및 3회 예취후에는 장마전 예취구가 장마후 예취구에 비하여 매우 높은 수준을 보였으며 ($P{\le}0.01$) 조파는 산파에 비하여 높았으나 유의차는 없었다. 또한 각 처리구의 월동전식생 피복율은 장마전 예취구는 장마후 예취구에 비해 오차드그라스의 구성비율은 높았고 잡초 및 나지의 구성비율은 낮았다. 5. 본 실험결과로 미루어보아 오차드그라스채초지의 2회 예취는 장마전에 실시하고 조파를 함으로서 잡초발생을 크게 줄일 수 있을 것으로 생각된다.