Experiment demonstrates that mulching and high-grade stock improve growth and reduce frost heaving in clay sites.
The experiment reported in this paper shows that mulching, because of its effect in reducing frost heaving, is essential in fall planting on bare clay sites, as is also the use of large, high-grade stock. Fertilizer markedly increased the growth of black locust but was somewhat injurious to red pine. With both species fertilizer reduced the severity of frost heaving.
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W. E. McQuilkin (1946) studied this question.
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