間作条件におけるメヒシバの発生生態 : 第1報光照射および温度処理

概要

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The germination of Digitaria ad scendens seeds which had been stored in dry storage after harvested were examined. The results were as follows: (1) Even under the favorable condition in light, temperature, and moisture, about 50 days were required to start the germination of the freshly harvested seeds; but after the ageing in dry condition, the speed of germination was accelerated. (2) The effect of light on breaking of seed-dormancy was weaker in a lower intensity than in the higher. (3) High temperature (40℃) was effective for breaking of dormancy and it was possible to make the dormant seeds germinated by furnishing with a temperature of 40℃ for five days. (4) The effect of light on the germination of partially awakened seed was found to be very clear, and the irradiation after soaking of the seeds for 24 hours was more effective. (5) The length of irradiation which required for the germination was shorter at high intensities, but the irradiation time was longer than a definite time, the difference between the light intensities became to be obscure. (6) When it became lower than the minimum temperature needed for germination, the effect of light even on the partially awakened seeds was diminished.
日本雑草学会の論文
1967-12-25