비소(砒素)의 토양처리(土壤處理)에 의한 수도체(水稻體)의 비소흡수(砒素吸收) 정도(程度) 및 생육(生育)에 미치는 영향(影響)을 조사(調査)하기 위하여 양토(壤土)와 사양토(砂壤土)에 수용성(水溶性) 염(鹽)인 $Na_2HAsO_4{cdot}7H_2O$로 비소(砒素)의 농도(濃度)가 0, 10, 25, 50, 100 및 150 ppm되게 각각(各各) 처리(處理)하여 pot 시험(試驗)한 결과(結果)는 다음과 같다. 1) 수도수량(水稻收量)은 토양중(土壤中) 비소농도(砒素濃度)가 높아짐에 따라 유의성(有意性) 있게 감소(減少)되었고 토성별(土性別) 유의성(有意性)있는 감소농도(減收濃度)는 사양토(砂壤土)가 2.75ppm, 양토(壤土)가 6.79ppm이었다. 2) 수량구성요소(收量構成要素)도 토양중(土壤中) 비소농도(砒素濃度)가 높아질수록 유의성(有意性)있게 각각(各各) 감소(減少)되었고 이중 천입중(千粒重)이 가장 높은 상관(相關)($-0.893^{{ast}{ast}}$)을 나타내었다. 3) 수도체(水稻體) 비소(砒素)는 대부분(大部分) 뿌리에 축적(蓄積)되어 있고 소량(小量)이 지상부(地上部)로 이행(移行)되었으며 부위별(部位別) 함량(含量)은 뿌리>줄기>엽신(葉身)>엽초>현미(玄米)의 순(順)으로 높았다. 4) 부임입수(不姙粒數)는 토양중(土壤中) 비소농도(砒素濃度)가 높을수록 증가(增加)되었으며 토성별(土性別)로는 사양토구(砂壤土區)가 양토구(壤土區) 보다 더 많았다.
A pot experiment was conducted to find out As uptake and critical levels affecting yield loss of rice plant. The arsenic was added to two soils of sand loam and loam in the from of $Na_2HAsO_4,;7H_2O$ at different As concenterations of 0, 10, 25, 50, 100, 150 ppm, respectively. Rice yields significantly decreased with increasing soil As levels and the critical As levels in soils were estimated to be 6.79 ppm for loam and 2.75 ppm for sandy loam. Yield components also decreased with higher soil As levels and the weight of 1000 grains showed the highest significant correlation with As level in soil. Most of arsenic was retained by the roots and a small amount of arsenic was translocated to the shoots. Arsenic content in plant organs was high in the order of root>stem>leaf blade>leaf sheath>brown rice. The number of sterillized grains also increased with higher As level in soil and it was much higher in sandy loam than in loam.
