Effects of rates and times of nitrogen application on the production and composition of dairy pastures in Waikato district, New Zealand

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Abstract
Nitrogen (N) was applied at 0, 25, 50, and 100 kg/ha in consecutive months from March to August 1980 and 1981 to pastures at No. 2 Dairy, Ruakura. Pasture production was measured in 5 harvests and the botanical and chemical compositions of the pastures were determined in harvests 1 and 4. N usually increased pasture growth in harvests 1 and 2 but reduced it in harvests 4 and 5 because of reduced clover content. N concentration in pasture followed a similar pattern. Responses increased but efficiency of N decreased with increasing rates of application. Efficiency of N applied in winter-early spring was twice that applied in autumn. Responses in early spring depended upon the rate of pasture growth at the time. In additional trials, 0, 25, and 50 kg N/ha was applied either 2 or 3 times to the same areas. Efficiency of N from repeated and from single applications was similar.

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