From the water culture of' Japanese barnyard millet, the following results are gained : 1) This grass can not grow normally in the culture solution free from boron. For the life cycles of this grass, 0.003 p.p.m. boron must be present in culture solution. 2) By the boron deficiency, following symptoms come out; (a) Greyish white lines appear on leaf tip. Afterward, that part browned and died. (b) Cessation of the terminal growth of stem. (c) Poor development, roughness and discoloration of root system. ( d) By extraordinary evelopment of many tillers, the shape of grass became bushy. (e) Mature. grains very rare. 3) Boron requirements for monocotyledone is about 10 per cent of dicotyledone.
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