各種ケイ酸資材施用による育苗期のイネいもち病の発病抑制

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We examined how to suppress seedling blast in rice (Oryza sativa L.) through the application of some silicic acid materials in nursery boxes. The results were as follows : 1. Two-hundred-fifty grams of silica gel reagent or 3 g (SiO_2 ingredient) of potassium silicate solution reagent per nursery box were the most and second most effective, respectively, of the 6 materials for suppressing seedling blast. 2. The content of silicic acid in the stem and leaf after applying 250 g of silica gel reagent or 3 g of potassium silicate solution reagent were 76 g kg^<-1> (4.5 times as much silicic acid as without any application) and 39 g kg^<-1> (2.3 times as high), respectively. Although the amount of silicic acid in the stem and leaf was not as much when the 3 g of potassium silicate solution reagent was applied, it was comparatively effective in suppressing seedling blast. 3. In nursery boxes, where 200 or 250 g of silica get fertilizer was applied, the occurrence of seedling blast was suppressed to about 10% of that of the untreated nursery boxes. In nursery boxes where 12 g of potassium silicate solution reagent was applied, the occurrence of seedling blast was suppressed to about 12.7% of that of the untreated nursery boxes. 4. From the above results we concluded that treatment of these silicic acid materials in nursery boxes is an effective way to suppress seedling blast in nursery boxes and is acceptable for the substitution of fungicides like tricyclazole.
社団法人日本土壌肥料学会の論文
2001-02-05

各種ケイ酸資材施用による育苗期のイネいもち病の発病抑制

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