Effect of Osmotic Suction on the Germination of Warm Season Grasses

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  • 暖地型牧草類種子の発芽に及ぼす浸透吸引圧の影響
  • ダンチガタ ボクソウルイ シュシ ノ ハツガ ニ オヨボス シントウ キュウイ

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Abstract

1. In order to obtain the fundamental informations to select the warm season grasses suitable for the mineral soil which has poor physical conditions and to control the soil moisture conditions in seed bed layer by watering or other methods, the relations between osmotic suction (+atm.) and the seed germination of warm season grasses as shown in table 1 were examined in the definite temperature room kept in 29-30℃. Osmotic solutions were prepared and adjusted by polyethylene glycol. 2. The germination percentage in all species lowered with the increase of osmotic suction, but the degree of decline varied considerably by species (Fig.1). Germination characteristics among the species differed by the levels of osmotic suction were shown as in table 2. 3. In general, the germination percentage in those species which seed were relatively small such as Panicum spp. and Rhodes grass was much more severely affected and lowered by lower osmotic suction in comparison with the species of large seed such as Sorghum spp. and Millet spp. Among the species of small seed, Love grass and Makarikari grass were less severely affected. 4. The germination rate of almost all species declined linearly with the increase of osmotic suction, but the extent of interspecific differences were not recognized so evidently as those observed in the decline of germination percentage (Fig.2).

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