Studies on the sulfur nutrition of crop plants (I) -The nutritional status of sulfur in the field-grown rice plants-

작물의 유황영양에 관한 연구( I ) -포장재배수도의 유황영양실태-

The nutritional status of sulfur in rice plants grown on various field conditions different in soil fertility, fertilizers used and weather was investigated as follows. 1. The critical percentage of sulfur in rice shoot grown in a sulfur deficient field appears to be over 0.2 around 30 days after transplanting. 2. The mean sulfur contents at harvesting stage were 0.22% and 0.43% in the ear and straw, respectively and increased more in the straw by the application of ammonium sulfate. 3. The ratio of sulfur contents in the straw and ear (straw/ear) showed the increasing tendency from north to south only in the fertilized fields. But it was not as such in the percent translocation, the mean values of which were 26% and 29% in the fertilized and non-fertilized, respectively. 4. The sulfur uptake amounted to 6kg and 10kg per acre in the non-fertilized and fertilized, respectively. 5. The sulfur content was decreased in the order of leaf blade+leaf sheath, stem and ear, and was higher in the low productive field than that of high productive field.

기후 토양 시비조건이 다른 수개포장에서 자란 벼의 유황영양상태를 조사한 결과 아래와 같다. 1. 이앙후 30 일경 유황결핍포장의 수도체내 유황의 임계함량(critical percentage)은 0.2%이상인것 같다. 2. 수확기 S 함량평균치는 이삭과 짚에서 각각 0.22% 및 0.43%이고 유안시비는 짚에서의 농도를 더욱 높였다. 3. 볏짚과 이삭의 S 함량비는 유안시비구에서만 위도가 낮을수록 증가하는 경향이나 이삭에의 전이율은 이와 관계없고 시비구에서 평균 26% 무비구에서 29%였다. 4. 유황흡수량은 무비구에서 6kg/10a 시비구에서 10 kg이었다. 5. 부위별 유량함량은 엽신+엽초>간>이삭의 순서이며 어느부위서나 저수답벼에서 높았다.