Effect of Application of Acidified Porous Hydrate Calcium Silicate and Porous Hydrated Calcium Silicate on the Growth of Rice Plants (Oryza sativaL.)

Abstract

tohoku.ac.jp 酸性化多孔質ケイ酸カルシウム水和物の pH が 水稲苗（Oryza sativa L.）の生育に及ぼす影響 1 2 3 1 2 3 要旨@@@@@@@@@@@@@@@@@@@@@@@@@@APS : acidified porous hydrate calcium silicate pH pH APS @@@@@@@@@@@@@@@@@@@@@@@@@@@@ APS pH 5. 33. 93. 0 APS APS 5. 3APS 3. 9APS 3. 0 pH APS pH @@@@@@@@@@@@@@@@@@@@@@@@@ pH APS 3. 0 APS 5. 33. 9 @@@@@@@@@@@@@@@@@@APS 3. 0 APS APS 3. 0 APS 3. 0 @@@@@@@@@@@@@@@@@@ APS 2 APS 3. 0 APS 3. 0 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ APS 5. 33. 9 @@@@@@@@@@@@@@@@@@ APS pH 3. 9 5. 5 キーワード @@@@@@@@@@@@@@@@@@ pH @@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@ PSporous hydrate calcium silicate @@@@@@@@@@@@@@@@@@@@@@ APSacidified porous hydrate calcium silicate APS @@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@ 2003Heinai 2005 APS PS pH pH 5. 5 @@@@@@@@@@@@@@@@@@@@@@@@ 1973 1981 pH @@@@@@@@@@@@@@@@@ pH 1989 APS pH pH APS pH pH APS Jpn. Abstract : We have developed acidifi ed porous hydrate calcium silicates (APS) with the fi nal pH of 3.0, 3.9 or 5.3 by adding of sulfuric acid to porous hydrate calcium silicate material. In this study, the effects of APS at various pHs applied to nursery bed soil on the growth of rice seedlings were investigated to determine the optimal pH of APS as an ameliorant for raising healthy rice seedlings. APS at pH 3.0 decreased the plant length of the seedlings by 10 to 15% compared to that at other pHs. Treatment with the APS at pH 3.0 decreased both shoot dry weight, and the ratio of shoot dry weight to the plant length of the seedlings. The root dry weight was the lightest in the seedlings treated with APS at pH 3.0; these root tissues, especially exodermis, sclerenchyma and endodermis, were intensively stained with hematoxylin and evans blue, showing the symptom of Al toxicity. Key word : Acidifi ed porous hydrate calcium silicate, Al toxicity, Evans blue staining, Material pH, Hematoxylin staining, Rice seedling, Root.

Combined Effects of the Continual Application of Composted Rice Straw and Chemical Fertilizer on Rice Yield under a Double Rice Cropping System in the Mekong Delta, Vietnam

“…Although not generally considered an essential element, Si is often beneficial for rice 1,9,12 . The Si concentrations of our rice straw (average 42.9 mg kg -1 ) were lower than the critical concentration (<50 mg kg -1 ) 4 and also the typical concentrations reported in Japan 5 .…”