Atrazine formulations for weed control in established lucerne

Forgie, C.D.

doi:10.30843/nzpp.1973.26.8924

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“…Time of herbicide application is also important because developing lucerne buds can be damaged if herbicide is applied too late, and this can delay spring production (Moot et al 2003). Current recommendations are for a clean-up grazing in winter (late June/early July in Canterbury) followed by application of these two herbicides 10-14 days later (Cassells & Upritchard 1968;Forgie 1973;Logan & Arnst 1973;Moot et al 2003). However, glyphosate has also been used (Arregui et al 2001;Dawson 1989Dawson , 1992Wilson 1997), although it is not registered for this use.…”

Section: Introductionmentioning

confidence: 99%

Yield and composition of lucerne stands in Central Otago after different winter grazing and weed control treatments

Roux¹,

Leask²,

Moot³

2014

ProNZG

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The effect of grazing date and time of spraying with a glyphosate/atrazine herbicide combination on a threeyear- old lucerne stand was studied on-farm in Central Otago. Total annual dry matter (DM) yield was highest in the weedy unsprayed control (14.8 t DM/ha) and lowest in the crop sprayed on 18 September (10.1 t DM/ ha). However, lucerne DM yield was highest from the 3 July and 22 August spray treatments (11.4 ± 0.39 t DM/ ha) and lowest in the unsprayed control at 7.7 t DM/ha. Phytotoxicity symptoms of glyphosate on the lucerne tended to be limited to crops sprayed on 18 September. To maximise yield, a winter clean-up grazing (June) followed by a winter herbicide application (July/August) when lucerne was approximately 3 cm high and with

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