The liquor expressed from decomposing pea haulm has been shown to be capable both of inhibiting the germination and retarding the growth of ryegrass (Lolium perenne), wheat (Triticum vulgare) and cress (Lepidum sativum). The toxic factor responsible is a mixture of the volatile fatty acids: acetic, propionic, butyric, valeric and caproic.
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Clarke et al. (1970) studied this question.
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