Studies on the Effects of Silicate and Phosphate Application on the Growth of Rice Seedling

수도묘(水稻苗)에 시용(施用)한 규산(珪酸)과 인산(燐酸)의 영향(影響)에 관(關)한 연구(硏究)

To determine the effects of the silicate and the phosphate on the rice seedlings, 200 grams dry soil of the paddy field taken in the petri dish of 15cm diameter were treated with three levels of silicate(wollastonite) and phosphate. And the same amounts of nitrogen and potash were added constantly to each treated petridish. 100 grains of rice of which variety is Nongrim 25 were sown on each treated petridish simultaneously. After five times continuous culture, the rice plants and the soil were analyzed chemically and the results obtained are summarized as follows: 1. Dry matter weight of the rice seedlings was significantly increased to the increased phosphate absorption, on the other hand that was decreased when the silica absorption was increased. 2. The higher the available phosphate content in the soil after the experiments, the lower the silica content as well as absorption by the plant, and the $SiO_2/P_2O_5$ ratio in the plant was significantly decreased. 3. By the wollastonite application, the available silica, the exchangeable calcium in the soil after the experiment, and the silica content as well as silica absorption and $SiO_2/P_2O_5$ ratio in the rice plant was significantly increased. 4. Higher correlation coefficient was obtained between the exchangeable calcium amount and the silica content or silica/phosphate ratio in the rice plant than the available silica content in soil itself. 5. It is possible to control the silica/phosphate ratio in plant by the control of the silica/phosphate ratio in soil. 6. The relation between the silica/phosphate ratio in plant (y) and the available silica/phosphate ratio in soil (x) was $y=0.665+1.420x-0.0825x^2$ and the goodness of fit(r) was 82%.

답(畓)에 시용(施用)한 규산(珪酸)과 인산(燐酸)의 영향(影響)을 조사(調査) 연구(硏究)하기 위해서 직경(直徑) 15cm의 Petri dish에 200grs의 풍건세토(風乾細土)와 3 수준(水準)의 규산(珪酸) 인산(燐酸) 처리(處理)를 하고 질소(窒素)와 가리(加里)는 동일량(同一量)을 매회(每回) 처리(處理)하는 9개구(個區)를 설치(設置) 농림(農林) 25호(號)를 100립(粒) 씩 최아(催芽) 낙종(落種)하여 5회(回) 계속(繼續) 재배(栽培)하고 식물체분석(植物體分析) 및 토양분석(土壤分析)을 실시(實施)한 성적(成績)을 분석(分析) 평가(評價)한 결과(結果)는 다음과 같다. 1. 인산(燐酸)의 흡수량(吸收量)이 많을수록 수도묘(水稻苗)의 건물중(乾物重)은 현저히 증대(增大)하였으나 규산(珪酸)의 흡수량(吸收量) 증대(增大)로 건물중(乾物重)은 감소(減少)하는 경향(傾向)을 보였다. 2. 시험(試驗) 후(後) 토양(土壤)의 유효 인산함량(燐酸含量)이 많은 것일수록 식물체중(植物體中)의 규산함량(珪酸含量) 및 흡수량(吸收量)은 감소(減少)하는 경향(傾向)이며 $SiO_2/P_2O_5$의 비율(比率)은 현저히 감소(減少)되었다. 3. 규회석(珪灰石) 시용(施用)으로 시험(試驗) 후(後) 토양중(土壤中)의 유효 규산(珪酸), 석회(石灰) 함량(含量)과 식물체(植物體) 중(中)의 규산(珪酸) 함량(含量), 규산(珪酸) 흡수량(吸收量) $SiO_2/P_2O_5$의 비율(比率)은 현저히 증대(增大)되었으며 4. 토양중(土壤中)의 유효규산함량 자체(自體)의 증대(增大) 보다도 석회함량(石灰含量)의 증대(增大)가 식물체(植物體) 중(中) 규산함량(珪酸含量) 규산(珪酸) 흡수량(吸收量) 및 $SiO_2/P_2O_5$ 비(比)의 증대(增大)와 더욱 높은 상관(相關)을 보였다. 5. 식물체중(植物體中)의 $SiO_2/P_2O_5$의 비율(比率)을 조절(調節)하기 위해서는 토양중(土壤中)의 $SiO_2/P_2O_5$의 비율(比率)을 조절(調節)하므로서 가능(可能)하며 6. 식물체중(植物體中)의 $SiO_2/P_2O_5$의 비율(比率)(y)은 시험(試驗) 후(後) 토양중(土壤中)의 유효 $SiO_2/P_2O_5$의 비(比)(x)와 $y=0.665+1.420x-0.0825x^2$의 회귀관계(回歸關係)가 있으며 적중율(適中率)($r^2$)은 82%였다.