水稻追肥用으로 試製된 NK 複肥 17-0-17 (粒狀 및 粉末狀)과 17-0-14의 效果를 單肥(尿素 및 鹽化加里)와 比較하기 위하여 신품종 水稻(밀량 23호)를 써서 圃場試驗을 實施했든바 그結果를 要約하면 다음과 같다. 1. 收量面에서 볼때 複肥穗肥는 單肥穗肥보다 더 效果的인 傾向이였다. 2. 粒狀 17-0-17 穗肥區에서 K 및 N의 吸收가 他區에 比해 많았으며 K/(Ca+Mg)값도 높았다. 3. 複肥區에서 加里와 窒素吸收量이 많았든 原因에 對해서는 本試驗성적만으로 說明이 어려웠다. 4. N-K複肥는 穗肥로 뿐만 아니라 水稻에 對한 卽 基肥 有效分蘗期나 最高分蘗期에 追肥 하여도 그 效果를 檢討해볼 만 할 것 같다.

In order to evaluate the effect of developed Nk compound fertilizers, 17-0-17 granular and powder, and 17-0-14 granules in comparison with single fertilizers, urea and potassium on rice (Oryzae sativa) ; cultivar, Milyang 23, (Orizae Sativa), a field experiment was carried out. Results obtained are as follows : 1. The top dressing of NK compound fertilizers tended to produce higher paddy yield than that of single fertilizers; urea and patasstum muriate. 2. The absorption of potassium and nitrogen by rice plant from the plot of NK granular compound fertilizer, 17-0-17, was greater than from the plots the absorption of those elements received other types of ferilizers and application method The absorded K/Ca+Mg ratio in milli equivalent basis in plant was also appeared to be in same order as the absorption of nitrogen and potassium. 3. From the results of present study it seemed necessary to evaluate the NK compound fertilizer for the top dressing at effective tillering stage of rice as well.