ON RELATION OF SOIL MOISTURE TO DEVELOPMENT OF RICE BLAST DISEASE WITH SPECIAL REFERENCE TO INOCULATION EXPERIMENTS ON PLANTS GROWN IN SOILS DIFFERING IN MOISTURE AND AMOUNTS OF NITROGENOUS MANURE. PART A-1
ARMY BIOLOGICAL LABS FREDERICK MD
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Results are presented of inoculation experiments performed on rice plant seedlings and spike pedicels of plants grown on soils with varying soil humidity and amount of nitrogenous fertilizer. The results of investigation of the natural infection of the adult leaf are also discussed. Using the ash figure technique, anatomical differences in the adult leaf were studied. Irrespective of the amount of nitrogenous fertilizer applied, rice plants grown on well irrigated soils were found to be more resistant to rice blast disease of both the leaf and the spike pedicel, when compared to plants grown on dry soil. Plants grown on soil with double the amount of nitrogenous fertilizer but well irrigated were found to be more resistant to rice blast disease of both the leaf and the spike pedicel than the plants grown on dry soil with only the standard amount of nitrogenous fertilizer.