수도품종간경합에 관한 연구

Competition Studies in Rice (Oryza sativa L.)

혼식의 효과와 그 원인을 검토하기 위하여 재식밀도, 시비량 및 혼식조합을 달리하여 실험을 하였던 바 그 결과를 요약하면 다음과 같다. 1. 혼식구의 수량은 재식밀도, 시비량 및 혼식조합에 따라 다소 차이는 있었으나 현저하지 못하였다. 2. 재식밀도, 시비량에 관계없이 수원 8002가 신002보다 경합능력이 높았다. 3. 혼식의 효과는 경합으로 인한 수량구성요소들간의 증감의 차와 경합능력의 차로 인한 혼식된 품종의 증가량과 감소량의 차로 표현되었다. 4. 혼식을 논의할 때 검토되어야 할 몇가지 점을 지적하였다.

In order to investigate varietal competition effects on yield of rice, two experiments were conducted under paddy field condition. In experiment I, two leading varieties were grown in pure and mixed stands and examined the influence of spacings and nitrogen levels on the varietal competition effects and competitive ability of two varieties. In experiment II, three leading varieties were grown in pure and mixed stands with different combinations and examined the competition effects on yield in different combinations. The results are summarized as follows: 1. No significant differences were found in grain yield between varietal mixture and pure stands, though the level of nitrogen and spacings affected plot yield. 2. In the mixture of Suwon ＃82 and Shin ＃2, Suwon ＃82 appeared to be a better competitor to the Shin #2 in terms of grain yield. 3. The performance of mixtures were determined by the balance of the increment of better competitor and the decrement of poorer competitor. Here, the increment of Suwon ＃82 due to competition did not much exceeded the decrement of Shin ＃2. 4. Spacings and Nitrogen levels, tested here, did not affect significantly to the varietal competition effects. 5. Jaekun, Paltal and Norin ＃6 showed no varietal difference in competing ability.