Item

Yield of subterranean clover after post-emergence herbicide application for broadleaf weed control

Taylor, BJO
Hofmann, RW
Moot, Derrick
Date
2020-09-09
Type
Journal Article
Fields of Research
ANZSRC::070308 Crop and Pasture Protection (Pests, Diseases and Weeds) , ANZSRC::0703 Crop and Pasture Production , ANZSRC::0701 Agriculture, Land and Farm Management
Abstract
A field experiment was established in Lincoln, Canterbury in autumn 2018 to evaluate the effect of acetolactate synthase (ALS) inhibiting herbicides on subterranean (sub) clover. Two herbicides, imazethapyr and flumetsulam, were applied to seven sub clover cultivars at the 4–5 trifoliate leaf stage during July 2018. By December 2018, both herbicides had reduced the broadleaf weed yield by 1000 kg DM/ha. Sub clover herbage yield in spring (3 Oct 2018) increased only for ‘Antas’ and ‘Napier’ cultivars but all cultivars had an increase in total annual herbage yield when herbicides were applied. Plots were managed for seed set so re-establishment was examined. Imazethapyr had a longer residual than flumetsulam, with greater control of broad-leaved dock (Rumex obtusifolius) eight months after application. Herbicide application had no effect on subsequent sub clover emergence the following year. This experiment demonstrated the potential to establish a pure sward of sub clover with the use of ALS inhibiting herbicides, which could be used to create a high legume base pasture before overdrilling grass the following year.
Rights
© 2020 The authors and NZGA
Creative Commons Rights
Attribution-NonCommercial-NoDerivatives
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