Effect of physical properties of surface soil on seedling emergence
1992
Yamada, N. (Kagawa Univ., Miki (Japan). Faculty of Agriculture)
Effect of some physical properties of soil on seedling emergence of some kinds of crops were investigated both under laboratory and field conditions. In laboratory test, under the constant condition of temperature and moisture of soil, germination and emergence of soybean, rice and wheat were experimented using four kinds of soils differing in their compacted stress, respectively. In a field of sandy soil, emergence tests naked barley, soybean and sweet corn were carried out each two times from 1982 to 1987. As a result of these emergence tests, though there are a little differences among the kinds of crops, it is proved that the gas phase of soil influences most significantly on seedling emergence, and especially in field, three phase including gas phase influence on it. Furthermore, as an experimental result on relation between three phases and air permeability of soil, air permeability under 10 -4 cm/s proves to prevent seedling emergence remarkably. Therefore, under profitable conditions of temperature and moisture, keeping air permeability of soil over 10 -4 cm/s seems necessary for satisfactory seedling emergence
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