1. NC-hybrid F_1 plants which were reported in the previous report were investigated on their winter hardiness and fertility. 2. F_1 plants derived from Rutabaga×Turnip and Rutabaga×Foliage vegetable which had tuberous roots, showed well-overwintering. F_1 plants derived from Rutabaga×Foliage vegetable and Rape×Turnip flowered early in May. This earliness in flowering seems promising for Rutabaga breeding in Japan. 3. More seeds were obtained from back-cross using NC-hybrids as mother plants than when used as male ones. Shimofusa turnip proved better in deessetting than Rutabaga when they were used in back-crossing. The fertility in these cases might be influenced by the earliness of flowering. 4. Reciprocal F_1 hybrids of the previous report, namely Turnip×Rutabaga (CN-hybrids), showed similarly tuberous roots and vigorous growth in general as in NC-hybrids.

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In this report, the comparisons of the length and the number of hairs and general structure of plant bodies of three species have been carried out These plants were cultured in three plots classified on the basis of their moisture content of soil. The results were follows: 1) The smallest number of hairs per unit of area were found on the leaves of Italian ryegrass growing in the soil with the highest moisture. The effect of amount of soil moisture on the the number of the hairs at leaves were significant in Italian ryegrass, and followed the series. low soil moisture > optimal soil moisture > high soil moisture 2) The furrows showing in the transverse section of leaf in Italian ryegrass is deeper than those in Rye and Oat, and this depth was decreased under dry condition. 3) The palisade and spongy parenchyma in leaf of Italian ryegrass were less densely packed than in leaf of Rye and Oat. And the relative proportion of the intercellular spaces were prominently developed in Italian ryegrass growing in soil of high moiture. (Fig. 1) 4) The radial air chambers were found in the root of Italian ryegrass growing in the soil of high moisture. (Fig. 2)

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[in Japanese]

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The experiment was carried out during 1955-1958, in Northern Kanto district. The purpose of this trial was to determine the effect of late cutting on the production of Orchard grass, Ladino clover and Red clover mixtures. They were submitted to the following treatments; with interval of 15 days between 3rd or 4th cuts, the time of cuttings were varied from 1 Oct. to 15 Dec. The results of this experiment are as follows: 1. It is suggested that the influence of late cuttings till the middle of Dec. is not significant to yields of next year. 2. In this year, the yields of dry matter tended to increase till the middle of Nov. and were maintained at the same level in the late of Nov. At that time, average temp. and min. average temp. pointed at 4-5℃, and 0-1℃ respectively. 3. Fluctuation of plant communities were examined, that was gradually increased Orchard grass, and decreased Ladino clover to the contrary, but the botanical compositions of next year were not signified between different cutting times.

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[in Japanese]

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[in Japanese]

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