동할발생조건(胴割發生條件)에 대(對)한 미립(米粒)의 형태(形態)나 성분함량(成分含量)의 영향(影響)을 알고저 비료시용방법(肥料施用方法)을 달리하여 재배(裁培)한 벼의 동할립(桐割粒)과 건전립(健全粒)을 구분(區分)하여 분석(分析)해본 결과(結果) 동할발생(桐割發生)은 삼강(三剛)벼가 락동(洛東)벼보다, 만기수확구(晩期收穫區)가 적기수확구(適期收穫區)보다 많았으며 3요소외(三要素外)에 규산질비료(珪酸質肥料)를 병용함으로서 동할율(桐割率)이 감소(減少)되었다. 동할립(桐割粒)은 건전립(健全粒)에 비(比)하여 천립중(千粒重) 및 미립(米粒)의 체적(體積)(립장(粒長)립폭(粒幅)립후(粒厚)), 립장(粒長), 립장(粒長)/립폭(粒幅)이 컸으며 품종간(品種間)에는 미립(米粒)의 립장(粒長)/립폭비(粒幅比)가 큰 삼강(三剛)벼가 락동(洛東)벼보다 동할율(胴割率)이 높았다. 동할(胴割)이 비교적(比較的) 잘 되는 삼강(三剛)벼는 미립내(米粒內) 규산함량(珪酸含量)이 낮았고 인산함량(燐酸含量)이 높았으며 동할(胴割)이 잘 안되는 락동(洛東)벼는 그 반대(反對)이었다. 그래서 삼강(三剛)벼는 미립내(米粒內) 규인비(珪燐比)가 낮았고 락동(洛東)벼는 높았으며 비료삼요소(肥料三要素)에 규산(珪酸)을 시용(施用)함으로서 그 함량비(含量比)를 높일수 있었다.

To investigate the influences of morphological features and the chemical compound of rice grain on the crack of rice kernels, rice was cultivated under the different method of fertilizer application and was harvested at optimal and late stage to the crack features of kernels of cracked and healthy grains. The results are summarized as follows ; The occurrence of cracked kernel was more severe in "Samgang-byeo" than in "Nagdong-byeo" and the rice harvested at the late stage was more cracked kernel than that of optimal harvest. The application of silicate fertilizer in addition to the N.P.K. fertilizer resulted in the decrease of cracked kernels. The grain weight, the grain volume (length width thickness), grain length and grain length/grain width etc. of the cracked kernels were larger than those of the healthy grains. The long "Samgang-byeo", having the long grain Shape, which has larger ratio of grain length/grain width than that of "Nagdong-byeo", shows higher rate of cracked kernels. The grain of "Samgang-byeo" which is easily cracked relatively it contains lower silica and higher phosphorus while "Nagdong-byeo" shows the opposite results. The ratio of silica/phosphorus in the grain was low in "Samgang-byeo" but it was high in "Nagdong-byeo". The ratio of silica/phosphorus in rice grain was increased by the application of silicate fertilizer in addition with N.P.K. fertilizers.

• 제상률(Dept. of Agronomy, Coll. of Agric., Kyungpook Natl. Univ.) | Jeh, Sang Yull