抄録
The effect of the three menthods of weed control and their influence on the growth and yield of upland rice was investigated in 1950. The results obtained were as follows: 1. The effect of harrowing by spring-tooth harrow and soil sprinkling among tillers on weed control was conspicuous, but that of double deep culture ploughing was not apparent. 2. The yield of upland rice was not influenced by deep ploughing, harrowing, and sprinkling soil among tilleres twotimes (on July 8th and 28th, but increased by sprinkling soil three times (on July 3rd, 18th, and August 1st). 3. There facts suggest that the effect of sprinkling soil on the yield of upland rice differ by the developing stage of crop when sprinkling soil is perfomed. Harrowing by the spring-tooth harrow and sprinkling soil among tillers will reduce the weeding labour in upland rice cultivation.
