Abstract
PERMANENT quadrat studies on the establishment of timothy grass (Phleum pratense) and white clover (Trifolium repens) in 1947 and 1948 showed timothy seedlings frequently dried up during hot spells. It was noticed that small seedlings growing close to larger ones or among white clover often remained healthy whereas others surrounded by bare ground died. The apparent explanation, for which support was given by Geiger's1 work, lay in the protection afforded by vegetative cover. Among other effects cover would lower evaporation from the top layer of soil and prevent temperature and humidity conditions from becoming extreme.
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