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Studies on the nature of rice blast resistance. I. The effect of silicic acid on the resistance. II. The effect of combined use of silicic acid and nitrogenous manure on the toughness of the leaf blade of rice and its resistance to rice blast. III. Relation between rice blast resistance and some physical and chemical properties of the different portions of the leaf blade of rice



Studies on the nature of rice blast resistance. I. The effect of silicic acid on the resistance. II. The effect of combined use of silicic acid and nitrogenous manure on the toughness of the leaf blade of rice and its resistance to rice blast. III. Relation between rice blast resistance and some physical and chemical properties of the different portions of the leaf blade of rice



Bull Sci Fak Terkult Kyusu Imp Univ 9(3): 291-307



The toughness and % of silica in the leaf blade of rice grown in soln. cultures with various amts. of silicic acid were detd. The water used in the cultures contained 13.3 mgm. SiO2 per l. and this was supplemented with SiO2 at the rate of 0, 50, 250 and 500 mgm. per l. Toughness of the leaf was measured by a puncture method using a Jolly balance. The resistance to blast and the % of silica in the leaf blade were proportional to the amt. of SiO2 in the culture soln., but the resistance of the leaf to puncture did not increase proportionately. Application of silicic acid to soil likewise increases the resistance of rice to blast. Toughness of leaves was inversely proportional to the quantity of N fertilizer supplied. Under equal applications of N fertilizer the % SiO2 in leaves was higher with applications of silicic acid to the soil, but the toughness of leaves was less than in plants grown without such applications. Therefore the puncture test is an index of resistance to blast only for plants grown under abnormal conditions such as an excess of N. The resistance of the leaf blade to puncture is greatest at the base and least at the tip, whereas the % SiO2 is greater at the tip than at the base, with N the reverse is true. Susceptibility to blast is proportional to the amt. of N but inversely proportional to SiO2 in different parts of the leaf blade. There is no definite relation between resistance to blast and resistance to puncture.

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