Studies on the improvement of Nursery method for Late-seasonal Cultivation of Rice Varieties (Indica × Japonica)

통일계(統一系) 수도품종(水稻品種)의 만식재배(晩植栽培)를 위(爲)한 육모방법(育苗方法) 개선(改善)에 관(關)한 연구(硏究)

This experiment was carried out to determine the most adequate type and period of nursery for the late seasonal cultivation of the new varieties of rice, Yusin and Josaengtongil. The results obtained are summarized as follows: 1. Semi-hot up-land nursery was much effective for the increase of the number of tillerings and the roots of rise seedlings compared with the semi-hot low-land nursery. The number of tillerings and roots was increased in 60 days seedlings compared with 50 or 60 days seedlings. 2. The abnormal heading has not appeared at the variety Yusin at all. The seedlings of Josaengtongil grown over 50 days at the semi-hot low-and nursery showed the abnormal heading, but the abnormal heading was not checked out at the seedlings of same variety grown for 60 days on the semi-hot upland nursery. 3. On the nursery not to cause the abnormal heading, earlier seeding was much effective for the hastening of the heading time and the hastening effect of heading time by earlier seeding was significantly greater at the variety Josaengtongil than Yusin 4. The number of ears per hill was significantly increased in the seedlings from the semi-hot up-land nursery compared with the semi-hot low-land nursery. 5. When the growing period of rice seedlings was not considered, the semi-hot up-land nursery resulted in higher yield of rice than the semi-hot low-land nursery. Considering the growing periods of rice seedlings, 40 days seedlings showed high yield at the semi-hot low-land nursery, however, at the semi-hot up-land nursery, 60 days seedlings showed higher yield of rice.

만식재배(晩植栽培)에 알맞는 묘대양식별(苗垈樣式別) 육묘일수(育苗日數)를 구명(究明)코져 유신(維新)과 조생통일(早生統一)을 공시(供試)하여 6월(月) 25일(日)에 이앙(移快)하여 본(本) 시험(試驗)을 실시(實施)하였던바 다음과 같은 결과(結果)를 얻었다. 1. 비닐보온육묘(保溫陸苗)가 비닐보온절충묘(保溫折衷苗)에 비(比)하여 분얼수(分蘖數) 및 수수(穗數)가 많았으며 육묘일수간(育苗日數間)에는 육묘일수(育苗日數)가 긴 것일수록 많았다. 2. 유신(維新)은 묘대일수감응도(苗垈日數感應度)가 작아서 묘대양식(苗垈樣式) 불구(不拘)하고 육묘일수(育苗日數) 60일(日)에서도 불시출수(不時出穗)가 없었으나 조생통일(早生統一)은 비닐보온절충묘대(保溫折衷苗垈)에서 육묘일수(育苗日數) 50일(日) 이상(以上)에서 불시출수(不時出穗)가 나타났고, 비닐보온육묘(保溫陸苗)에서는 60일(日)까지도 불시출수(不時出穗)가 나타나지 않았다. 3. 불시출수(不時出穗)가 조장(助長)되지 않는 묘대환경하(苗垈環境下)에서는 조파(早播)에 의(依)하여 출수촉진(出穩足進)의 효과(效果)가 있었으며, 기중(其中) 조생통일(早生統一)이 유신(維新)보다 현저(顯著) 하였다. 4. 주당수수(株當穗數)는 비닐보온육묘(保溫陸苗)가 비닐보온절충묘(保溫折衷苗)보다 육묘일수(育苗日數)에 관계(關係)없이 증가(增加)되었다. 5. 수량(收量)은 양(兩) 품종(品種) 공(共)히 비닐보온육묘(保溫陸苗)에서 많았으며 육묘일수간(育苗日數間)에는 비닐보온절충묘(保溫折衷苗)에서는 40일묘(日苗) 비닐보온육묘(保溫陸苗)에서는 60일묘(日苗)에서 양(兩) 품종(品種) 공(共)히 증수(增收) 되었다.