本 硏究는 벼(Oryza sativa L.; 品種名 : 동진벼 10日苗)를 供試作物로 하여 안개 및 非안개 條件下에서 生育反應 差異를 밝히고, 典型的인 雜草種(피를 비롯한 6種의 논 雜草)과의 競合樣相과 競合限界水準을 究明하여 안개 常習地에서의 논 雜草防除體系 確立을 위한 基礎資料를 마련할 目的으로 遂行되었다. 本 硏究는 안개 製造 裝置가 設置된(Auto foggy system: SAE Kl RTN Co.) 溫室內 Tray 試驗으로 遂行되었으며 試驗結果를 要約하면 다음과 같다. 實驗 1. 안개條件下에서 水稻의 生長量 差異 1) 안개條件下에서의 草長의 差異가 없었고, 分蘖數는 적으나 有效分蘖 比率이 높고 無效分蘖이 抑制되는 傾向임. 2) 안개條件에서는 出穗率이 減少되고 出穗가 遲延되는 傾向임. 3) 안개條件에서는 水稻 藁乾重에는 差異가 없으나 收量構成要素인 穗數, 1穗當 平均 穎花數, 千粒重 및 登熟率이 減少하고 특히, 正祖重과 玄米重에서도 減少하는 傾向임. 實驗2. 안개條件의 雜草競合 樣相과 限界期間 1) 안개條件下에서 競合期間別 草長의 差異는 없었고, 分蘖數에서는 競合期間이 짧을수록 특히 無雜草區, 競合 20日區에서 안개로 인한 分蘖數 減少가 많음. 2) 안개條件에서는 出穗率이 減少하고 특히 競合期間이 길어질수록(60日 以上) 出穗率이 떨어지고 出穗開始도 2-4日 遲延되는 傾向임. 3) 안개條件下에서 藁乾重의 差異는 競合期間이 길어질수록(40日 以上) 差異가 크고, 收量의 差異는 競合期間이 無競合(0日)과 40日 以上에서 가장 심한 傾向임.

The objectives of the present study were to find out the differences in growth and weed competition of rice under the foggy and non-foggy condition, and finally, the fundamental data for the establishment of the paddy weed control system under the locational foggy regions. The research was carried out on tin trays(0.12㎡) in greenhouse equipped with an Auto Foggy System(SAE KI RTN Co.). The results are summarized as follows: Exp. I. Difference in rice growth under the foggy and non-foggy condition. 1. While the plant height was not affected, the number of tillers was decreased by the foggy condition. The ratio of the number of effective tiller, however, became higher under the foggy condition. 2. Due to the fog present, the heading rate was decreased and heading time was delayed. 3. The foggy condition did not affect the dry weight of rice straw whether they were grown under the foggy or non-foggy condition. However, yield components such as the number of ears, the number of grains per ear, thousand kernel weight and percentage of ripeness were reduced. Particularly, weights of perfect brown and unpolished rice were also decreased. Exp. II. Effect of the duration of competition between weed and rice grown under the foggy condition on the growth of rice plant. 1. There was no difference in the height of rice grown under a different duration of competition. There was a clear tendency that the number of tillers of rice grown under the foggy condition was decreased as the duration of competition was decreased. 2. When the duration of competition was longer than 60 days, the heading rate was decreased and the initiation of heading was also delayed by 2-4 days. 3. Under the foggy condition, the duration of competition for more than 40 days affected dry weight of rice straw and the difference in yield was greatest in the non-competition and competition for more than 40 days.