To maintain a high rate of production from pastures one essential is an adequate supply of nitrogen, and this supply can be assured most economically by introducing strong-growing clovers into the sward. Sufficient clover plants can be readily established on arable. land by employing a suitable seed mixture when the pasture is renewed. On unploughable land, however, there are no opportunities for the complete renewal of pasture, and other methods of introducing clovers have to be found.
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F. E. T. Suckling (1950) studied this question.