窒素施用 時期가 水稻의 生育및 收量에 미치는 影響 = The Effect of the Time of Nitrogen Application to the Growth and Yield of Rice

국문 초록 (Abstract)

本 實驗은 농림6호와 농림 25호에 對해 窒素施用率을 各 生育 시기별로 달리하여 水稻의 形態的 變化를 살피는 한편 收量構成 要素와 收量에 對하여 調査 하였는데 그 結果는 다음과 같다
1) 분열기에 追肥를 全量 施肥하였을 때 (1 處理區) 草長과 莖數가 一般的으로 가장 높은 數値를 나타내었고 穗長도 긴 편이었다. 그러나 有效莖의 比率은 적었고 穗數는 가장 많았으며 임실율은 높은 편이었다.
收量에 있어서는 農林6號는 가장 적으나 농림 25호에서는 오히려 높은 편이었다.
2) 幼穗形成期에 2차 追肥를 實施한 區에서는 (2 處理區) 農林 6號, 농림 25號 共히 가장 높은 收量을 나타내었다.
草長과 莖數 역시 높은 편이며 穗長은 最高値를 보이고 있다.
3) 減數 분얼기에 追肥를 施用한 區에서는 ( 3 處理區) 生育狀況은 不良한 편이며 농림 6호의 경우는 높은 收量을 보였으나 농림 25號의 경우는 不良한 편이었다.
4) 出穗直前 및 出穗後 15일에 追肥를 施用한 것은 生育 狀況 및 收量 共히 나쁜 편이다. 농림 25號의 경우는 1 處理區에 比해 10% 以上 減收되었다.

다국어 초록 (Multilingual Abstract)

In rice growing arears of Korea many experiments on rice were carried out at several research institution. In this experiment six and eight kirograms each phosphate and potash per 10 ha. was applied as basal dressing and several each quantities of nitrogen were applied at different growing stages of rice.
The results were summaried as follows.
1. When all nitrogen was applied at tillering stages; The legnth of grass and tiller, and the number of stem were good in large number of the experiment. Though the yield of Nonglim No.6 was the least put the yield of Nonglim no.25 was very good.
2. When the nitrogen was applied at ear formation stages as 2nd top dressing, the yield or rice were best in this experment.
3. Though the heavy application of nitrogen at ear formation stage or the split application of it at ear formation and heading stages was generally very effective, best results were obtained in most cases, when two dressings one as basic and the other at the ear formation stage, were given. And three applications at tramsplanting, at effettive tillering, and at ear formation stages gave best results.