Tow strains of Sorgo hybrids, So-5 and So-8 were obtained by intervarietal hybridization of Sorgo X Sudan grass. The former strain is So-3 (a Japanese native variety of Sorgo with red grain and dense head) X So-1 (Sudan grass), and the latter one is So-4 (a Japanese native variety of Sorgo with black grain and loose head) X So-1 The majority of the characteristics of both F_1 plants were intermediate, however remarkable hybrid vigor was demonstrated in some important characters as soilage crops, i.e. plant height, leaf length, etc. Furthermore, vigorous tillering and regenerating ability and high disease resistance of parental plants were introduced into the F_1 plants. Otherwise, genic segregation of the main characters in F_2 generation of Sorgo hybrids (So-5) which are closely related to the productivity of the soilage, i. e. plant height, number of stalks, diameter of stalks and heading period, showed the continuous variation curves having a striking mode and small range of distribution. Moreover the crop grown from F_2 generation seed was not so much notably inferior in the hybrid vigor to the crop grown from F_1 generation seed. From the data discribed above it may be concluded that the possibility of practical cultivation of F_2 generation must be admitted. The observations clearly demonstrated that the state of the crop grown from F_2 seed is as much regular as either parent and heavy harbest is obtained as the result of competition occured among individuals growing close together. Results obtained from the performance tests in these three years were summarized as follows: So-5 F_2 was most productive, and F_3 of this strain showed also high yields of soilage if the F_2 individuals were selected properly. So-8 F_2 showed almost similar productivity as So-5, however, had more slender stalks and rather longer internode than the latter. Some characteristics of Sorgo hybrids both So-5 and So-8 suitable for practical culture of soilage are presented below: 1) Regenerating ability after cutting the stalks is distinctly strong in Sorgo hybrid in contrast with parent Sorgo. Accordingly if the seeds once sown, soilage harvest may be done two or more times successively until the frost season. 2) It is a convenient point in contrast with dent corn that Sorgo hybrid is hard to fall down even by the considerably strong wind or rainfall. 3) Resistance to fungus deseases distinctly appeared in Sorgo, while Sudan grass is quite sensitive. F_1 plants almost entirely resistant and in F_2 generation considerable resistance are observed in general containing either entirely resistant type or somewhat sensitive type of individuals. 4) Sorgo hybrid shows high drought resistance and has a wide range of adaptability to soils. 5) Soilage of Sorgo hybrid are suited to the taste of many kinds of livestock. because the stalks containing some quantities of sugars.

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1. The effects of nitrogen fertilization and late fall clipping on the yield of bigflower vetch (Vicia glandiflora)-Italian ryegrass(Lolium multiflorum) mixed cultivation was studied. 2 So far as the yields of green forage or dry matter are concerned, single culture of the vetch was very poor, and on the contrary, ryegrass and the mixtures performed heavier especially when fertilized with sufficient nitrogen. In the cases of low nitrogen level, mixtures surpassed the single cultures. 3. Component of vetch in the forage was very low under the high level of nitrogen fertilization, but it was proceeded under the poor nitrogen level, especially at the later stages of growth when vetch thrived. 4. Total nitrogen percentages of the vetch forage was indicated about three times as much as of the ryegrass. Lowering of the percentages was observed with their growth. Thrice cut forages indicated higher percentages of nitrogen than the twice cut. 5. Mixtures yielded better than single cultures in total crude protein. Especially under the low nitrogen level of fertilization. they yielded highest, which was attributed to the fact that more parts of the yield were performed by vetch in this condition. 6. Thrice cuttings resulted same levels of total crude protein yield as the twice cuttings. in other words, late fall clipping did not reduce the yield.

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This paper deals with the results of experiments carried out by the authors to know how to cultivate red clover on special grassland. Red clover was planted in Autumn 1953 and hevested six times in folowing tow years. This experimental plots were as follows. 1. Seeding by brodcast method. 2. Seeding in dots. 3. Seeding with soil dumpling mixed with seed. 4. Seeding with cattle-dung dumpling mixed with seed. 5. Transplanting of seedling. The results of experiments are summarised as follows. 1). Little differences in the total yields of forage obtained in tow years were seen between plots. 2) The superiar grass of land was Inperata cylindrica (Imperata cylindrica Beauv. var. Koenigii Durand et Sching) at first and had replaced Digitaria ciliares (Digitaria ciliaris Pers.) later owing to the cultivation of red clover. 3) Red clover planted on grassland was withered gradually in Summer of 1954 and 1955 by the effects of high temperature and luxuriant growth of Digitaria ciliaris.

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Growth, yields and mineral composition of red clover were investigated with various rate application of calciferous and phosphorous fertilizer. The results obtained were summarized as follows; (1) Application of phosphorous was effective greatly to the growth and the yields of the plant in both pots and field, and it was remarkable when the red clover was grown in the cold season. (2) Application of calciferous was less effective than that of phosphorous in both experinrents (pots and field) (3) The effects of calciferous and phosphorous fertilizer were remarkable, when these were applied at the same time. (4) Ca content of red clover increased when calciferous were more applied, but decreased in the case phosphorous were more applied. Variance of P content were not appearance by the rate of the fertilizer. (5) In the field, the growth and the yields of red clover after the first cutting were almost did not affective among the trectments.

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