THE USE OF NITROGEN ON HILL COUNTRY

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Abstract
Results from trials at Te Kuiti in 1971 and 1972 substantiated for the better fertility Mairoa Ash soils the results obtained from nitrogen trials elsewhere in New Zealand. High responses (24 to 39 kg DM/kg N for applications of 2.5 kg N/ha) were obtained from early spring applications. Substantial carry-over responses (up to 65% of total response) were measured for applications made in the cold winter months of 1972. Evidence from overseas and New Zealand is reviewed which suggested higher residual responses to applied nitrogen in grazing trials than in mown plot trials. An economic analysis based on the Te Kuiti trial results investigates the profitability of hay versus nitrogen, and optimum rates of nitrogen application for two cattle fattening policies. Some practical aspects of using nitrogen on King Country farms are considered.

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