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Crop responses to sulfonylurea residues in soils of the subtropical grain region of Australia

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Walker, S.R., Barnes, J.E., Osten, V.A., Churchett, J.D. and McCosker, M. (2000) Crop responses to sulfonylurea residues in soils of the subtropical grain region of Australia. Australian Journal of Agricultural Research, 51 (5). pp. 587-596. ISSN 1836-0947


Article Link: https://doi.org/10.1071/AR99040


Crop response following applications of sulfonylurea herbicides can vary considerably across the grain region of subtropical Australia. The aim of the study was to develop recommendations for safe re-cropping following chlorsulfuron, triasulfuron, and metsulfuron-methyl specific for the different soils and climates of this region. Seedling dry matter (SDM) and grain yield were measured at 17 sites over 4 seasons. Soils were ferrosols (pH 5.5–6.8), sodosols (pH 6.6–7.1), and vertosols (pH 7.8–9.0). Sorghum and sunflower were sown at plant-backs between 2 and 20 months, and chickpea at 10–13 months, after applications of sulfonylurea herbicides. Seedling response of the summer crops to these herbicides was substantially different for the 3 soils. Crop response in theferrosols was largely unaffected by plant-back, soil, or climatic factors after a minimum of 2–3 months. In contrast, response of summer crops in the vertosols and sodosols was strongly affected by plant-backs for up to 10 months, and SDM was more affected in sodosols than in vertosols. Predictive relationships between SDM and plant-back, cumulative temperature, and measured chlorsulfuron residues were developed for sowing summer crops in these soils. In ferrosols and vertosols, chickpea was unaffected by any treatment following plant-back of 10–12 months. These findings indicate that shorter re-cropping is possible in this region than currently recommended. However, the decision should be based not only on plant-back, but on soil type, cumulative temperature, and possibly even residue level in soil. These more specific recommendations will improve the safety and flexibility of re-cropping following applications of sulfonylurea herbicides in this region.

Item Type:Article
Subjects:Agriculture > Agriculture (General) > Soils. Soil science
Plant pests and diseases > Pest control and treatment of diseases. Plant protection > Pesticides
Live Archive:07 Jan 2024 23:26
Last Modified:10 Jan 2024 01:25

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