Responses of ryegrass, browntop, and an unimproved resident pasture in hill country, to nitrogen, phosphorus, and potassium fertilisers

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Abstract
Changes in pasture plant species composition of a resident low fertility hill pasture, in response to a wide range of application rates of N, P, and K fertilisers, were measured under mowing. Clover yields were increased and depressed respectively by increasing rates of P and N. Whereas brown top (Agrostis tenuis Sibth) content increased with application of either N or P, ryegrass (Lolium perenne L. ) responded to the combined application of N and P. The response pattern of sweet vernal and crested dogstail contents was the reverse of that shown by ryegrass.

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