The response of grass-clover and pure-grass leys to irrigation and fertilizer nitrogen treatment. 1. Irrigation effects

Reid, D.; Castle, M.E.

J. Agric. Sci. Came 64(2): 185-94


Accession: 014768219

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The experimental swards were S23 perennial rye-grass with S100 white clover, S23 ryegrass alone, S37 cocksfoot with S100 white clover, and S37 cocksfoot alone. The irrigation treatments were: a control (no water) treatment, and 2 treatments which were irrigated to planned deficit levels of 2 or 0.5 in. below field capacity. The soil moisture deficit patterns indicated a potential irrigation requirement for periods of 10-14 weeks in each of the 3 yr, and the average amounts of water applied were 3.63 and 5.13 ac-in./yr in the 2 and 0.5 in. deficit treatments, respectively. The mean response to irrigation was 168 and 156 lb of herbage DM/ac-in. of water applied on the 2 in. and 0.5 in. deficit treatments, respectively. Calculations showed that 5 ac-in. of water gave the same increase in herbage yield as an application of approximately 40 lb of fertilizer N/ac. F.