Pyroxasulfone efficacy for annual ryegrass control is affected by wheat residue height, amount and orientation

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Abstract

BACKGROUND: Pre-emergent herbicides play an important role in conservation agriculture, however, crop residues on the soil surface in these systems can intercept a considerable amount of herbicide during application. Cutting crops relatively high at harvest has some advantages, such as allowing faster harvest, and this also means that there is less horizontal residue on the soil surface. This field study tested the impact of standing wheat residue height and amount of horizontal residue on the interception, leaching and weed-control efficacy of the pre-emergent herbicide pyroxasulfone in the 2015 and 2016 growing seasons. RESULTS: Spray coverage of pyroxasulfone declined from 14.6% to 7.5% with increasing amounts (0 to 4 t ha−1) of horizontal wheat residue. Horizontal wheat residue at 1 t ha−1 had 10.3% spray coverage (more herbicide interception) compared with 15.4% for the equivalent amount of standing residue. Greater amounts of horizontal residue also significantly reduced the efficacy of pyroxasulfone in controlling ryegrass in the field and decreased pyroxasulfone concentrations in the soil. Rainfall after herbicide application increased herbicide efficacy for all residue amounts. Generally, cutting standing residue higher resulted a relatively small decrease in spray coverage at the soil surface and weed control efficacy, and this was significant only between nil stubble and 0.3 m cut height. CONCLUSION: Cutting residue relatively high, leaving less on the surface, improves spray coverage and herbicide efficacy compared with having more horizontal residue. This research may assist farmers and advisors to maximize the efficacy of pre-emergent herbicide in no-tillage systems.

Original languageEnglish
JournalPest Management Science
DOIs
Publication statusE-pub ahead of print - 20 Aug 2019

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pyroxasulfone
Lolium
spray coverage
herbicides
wheat
pesticide application
weed control
soil
stubble
crop residues
no-tillage
leaching
growing season
farmers
agriculture
rain
crops

Cite this

@article{55acc7d7bd054698a7de6f6687ed6b7d,
title = "Pyroxasulfone efficacy for annual ryegrass control is affected by wheat residue height, amount and orientation",
abstract = "BACKGROUND: Pre-emergent herbicides play an important role in conservation agriculture, however, crop residues on the soil surface in these systems can intercept a considerable amount of herbicide during application. Cutting crops relatively high at harvest has some advantages, such as allowing faster harvest, and this also means that there is less horizontal residue on the soil surface. This field study tested the impact of standing wheat residue height and amount of horizontal residue on the interception, leaching and weed-control efficacy of the pre-emergent herbicide pyroxasulfone in the 2015 and 2016 growing seasons. RESULTS: Spray coverage of pyroxasulfone declined from 14.6{\%} to 7.5{\%} with increasing amounts (0 to 4 t ha−1) of horizontal wheat residue. Horizontal wheat residue at 1 t ha−1 had 10.3{\%} spray coverage (more herbicide interception) compared with 15.4{\%} for the equivalent amount of standing residue. Greater amounts of horizontal residue also significantly reduced the efficacy of pyroxasulfone in controlling ryegrass in the field and decreased pyroxasulfone concentrations in the soil. Rainfall after herbicide application increased herbicide efficacy for all residue amounts. Generally, cutting standing residue higher resulted a relatively small decrease in spray coverage at the soil surface and weed control efficacy, and this was significant only between nil stubble and 0.3 m cut height. CONCLUSION: Cutting residue relatively high, leaving less on the surface, improves spray coverage and herbicide efficacy compared with having more horizontal residue. This research may assist farmers and advisors to maximize the efficacy of pre-emergent herbicide in no-tillage systems.",
keywords = "bioassay, conservation agriculture, no-tillage, pre-emergent herbicides",
author = "Yaseen Khalil and Ken Flower and Siddique, {Kadambot H.M.} and Phil Ward",
year = "2019",
month = "8",
day = "20",
doi = "10.1002/ps.5590",
language = "English",
journal = "Pest Management Science",
issn = "1526-498X",
publisher = "John Wiley & Sons",

}

TY - JOUR

T1 - Pyroxasulfone efficacy for annual ryegrass control is affected by wheat residue height, amount and orientation

AU - Khalil, Yaseen

AU - Flower, Ken

AU - Siddique, Kadambot H.M.

AU - Ward, Phil

PY - 2019/8/20

Y1 - 2019/8/20

N2 - BACKGROUND: Pre-emergent herbicides play an important role in conservation agriculture, however, crop residues on the soil surface in these systems can intercept a considerable amount of herbicide during application. Cutting crops relatively high at harvest has some advantages, such as allowing faster harvest, and this also means that there is less horizontal residue on the soil surface. This field study tested the impact of standing wheat residue height and amount of horizontal residue on the interception, leaching and weed-control efficacy of the pre-emergent herbicide pyroxasulfone in the 2015 and 2016 growing seasons. RESULTS: Spray coverage of pyroxasulfone declined from 14.6% to 7.5% with increasing amounts (0 to 4 t ha−1) of horizontal wheat residue. Horizontal wheat residue at 1 t ha−1 had 10.3% spray coverage (more herbicide interception) compared with 15.4% for the equivalent amount of standing residue. Greater amounts of horizontal residue also significantly reduced the efficacy of pyroxasulfone in controlling ryegrass in the field and decreased pyroxasulfone concentrations in the soil. Rainfall after herbicide application increased herbicide efficacy for all residue amounts. Generally, cutting standing residue higher resulted a relatively small decrease in spray coverage at the soil surface and weed control efficacy, and this was significant only between nil stubble and 0.3 m cut height. CONCLUSION: Cutting residue relatively high, leaving less on the surface, improves spray coverage and herbicide efficacy compared with having more horizontal residue. This research may assist farmers and advisors to maximize the efficacy of pre-emergent herbicide in no-tillage systems.

AB - BACKGROUND: Pre-emergent herbicides play an important role in conservation agriculture, however, crop residues on the soil surface in these systems can intercept a considerable amount of herbicide during application. Cutting crops relatively high at harvest has some advantages, such as allowing faster harvest, and this also means that there is less horizontal residue on the soil surface. This field study tested the impact of standing wheat residue height and amount of horizontal residue on the interception, leaching and weed-control efficacy of the pre-emergent herbicide pyroxasulfone in the 2015 and 2016 growing seasons. RESULTS: Spray coverage of pyroxasulfone declined from 14.6% to 7.5% with increasing amounts (0 to 4 t ha−1) of horizontal wheat residue. Horizontal wheat residue at 1 t ha−1 had 10.3% spray coverage (more herbicide interception) compared with 15.4% for the equivalent amount of standing residue. Greater amounts of horizontal residue also significantly reduced the efficacy of pyroxasulfone in controlling ryegrass in the field and decreased pyroxasulfone concentrations in the soil. Rainfall after herbicide application increased herbicide efficacy for all residue amounts. Generally, cutting standing residue higher resulted a relatively small decrease in spray coverage at the soil surface and weed control efficacy, and this was significant only between nil stubble and 0.3 m cut height. CONCLUSION: Cutting residue relatively high, leaving less on the surface, improves spray coverage and herbicide efficacy compared with having more horizontal residue. This research may assist farmers and advisors to maximize the efficacy of pre-emergent herbicide in no-tillage systems.

KW - bioassay

KW - conservation agriculture

KW - no-tillage

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U2 - 10.1002/ps.5590

DO - 10.1002/ps.5590

M3 - Article

JO - Pest Management Science

JF - Pest Management Science

SN - 1526-498X

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