Pasture irrigation in the Mackenzie Basin 2. Vields on a shallow outwash soil

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Abstract
Trials over 5 years on a border-dyked irrigated yellow-brown earth (YBE) soil of the Acheron set with initial cover crops and various species mixtures gave mean annual yields of only 3.7–5.7 DM/ha, even though annual rates of applied fertiliser were up to 1 t/ha superphosphate and 200 kg N/ha. There was large within-paddock variability from 5 × 2 m plots with yields of 0.1–11.1 t/ha/a related to soil depth. The pastures remained white- and red clover-dominant with negligible establishment from repeated grass sowing of cocksfoot, ryegrass, timothy, or tall fescue. Superphosphate responses were limited to the half year after application.

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