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The study reported here investigates the effect of P. lagenophorae on competition betwen S. vulgaris and Euphorbia peplus L. (petty spurge), an annual weed which often occurs with S. vulgaris on cultivated land. The small stature and slow growth of E. peplus suggested that it would compete poorly with S. vulgaris and so provide a comparison with the results obtained with lettuce
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N. D. Paul (1989) studied this question.
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