Relation of soil moisture content to resistance of wheat seedlings to low temperatures
1926
Under extreme depressions of temperature, such as occurred in these investigations, low soil moisture, due to its retardation of the life processes of plants, exerts a protective influence during the first part of the exposure. After killing once sets in on the low moisture soil it progresses rapidly. Due to the greater activity of the plants grown on the higher moisture soils killing on them begins sooner but progresses less rapidly. The more active the plants at the time of freezing the more marked is the protective influence of low soil moisture content during the early periods of exposure. More plants survive on the high than on the low moisture soils. The plants on the soils containing 40 to 50% moisture were always the last to reach the point of complete killing. Wheat seedlings become more susceptible to low temperatures with advance in age.
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