사질답(砂質畓) 토양(土壤)에서 수도생육및 수량(收量)에 미치는 토양개량제의 효과

Application of Some Soil Amendment Materials to Sandy Soil and the Growth of Rice Plant

사질답토양(砂質畓土壤)의 이화학적(理化字的) 성질(性質)을 개량(改良)하기 위(爲)하여 생고(生藁), 인곡, 규산질비료(珪酸質肥料), 산적토(山赤土) 및 Zeolite 등(等)의 토양(土壞) 개량제(改良劑)를 시용(施用)한 후(後) 수도생육 및 수량(收量)에 미친 영향(影響)을 비교(比較) 검토(檢討)한 결과(結果)는 다음과 같다. 1. 토양개량제(土壞改良劑) 시용(施用)으로 경수 초장(草長) 및 건물중(乾物重) 증가하였고 Zeolite시용구(施用區)는 초기생육(初期生育)보다 후기생육(後期生育)이 양호(良好)하였다. 2. 수도증수 효과(效果)는 규산질비료(珪醒質肥料) 인곡 Zeolite시용구(施用區)가 각각(各各) 1%수준(水準), 산적토시용구(山赤土施用區)가 5%수준(水準)에서 유의적(有意的)인 증수가 인정(認定)되었으나 생고시용구(生藁施用區) 유의차(有意差)가 없었다. 사질답토양(砂質畓土壤)에서 개량제(改良劑) 시용(施用)에 의(依)한 증수요인은 등열비율(登熱比率) 수당입수 및 조고비율등(租藁比率等)이 증가한 때문이었다. 3. 수도분체내 양분함량(養分含量)은 토양개량제(土壤改良劑) 시용(施用)으로 출수기(出穗期)까지 규산함량(珪醒含量)이 지속적(持續的)으로 증가하고 최고(最高) 분얼기(分蘖期)와 유수형성기(幼穗形成期)에 질소함량(窒素含量)이 증가하였으며 유수형성기(幼穗形成期) 인산함량(燐酸含量)이 높았다. 이들이 증수의 원인(原因)으로 나타났으나 한편 생고시용구(生藁施用區)는 출수기(出穗期)에 질소(窒素) 인산(燐酸) 및 규리함량(珪里含量)은 높았으나 규산함량(珪醒含量)이 낮았다. 4. 토양개량제(土壞改良劑)를 시용(施用)함으로서 pH와 CEC가 높아지고 규산(珪醒) 및 유기물(有機物)의 함량(含量)이 증가하였다.

This study was conducted to evaluate the effects of application of several soil amendment materials to an alluvial sandy soil on the rice growth and yield during the 1979. The materials used were the combinations of rice straw, rice hull, silicate fertilizer, red earth and zeolite. The results obtained were summarized as follows : 1. The application of soil amendment materials considerably increased the number of tillers, plant height and dry matter of rice plant. Particularly, the zeolite treated plot resulted in much better growth in the late stage rather than in the early stage. 2. The plots treated with silicate fertilizer, rice hull and zeolite significantly increased the rice yield and so did those with red earth statistically at 5 % level. However, it was not significant with rice straw. 3. By the application of these materials, the silica content in rice plant was continuously increased untill the heading stage, the nitrogen content was high at the maximum tillering stage and the panicle initiating stage and the phosphorus content was high at panicle initiating stage, which were censidered to be the factors of yield increase. However, in the straw treated plot, the contents of nitrogen, phosphorous and potassium were high, while the silica content was low in rice plant. 4. Further, soil pH, C. E. C., content s of organic matter and silicate in soil treated with those materials were increased after experiment. compared with in the soil before experiment.