Integrated weed control of herbicide-resistant water foxtail (<i>Alopecurus aequalis</i>) in winter wheat using shallow tillage as a core technique

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  • Ono Yukinori
    Fukuoka Agriculture and Forestry Research Center Chikugo Branch
  • Sato Hirokazu
    Fukuoka Agriculture and Forestry Research Center Chikugo Branch
  • Odahara Koji
    Fukuoka Agriculture and Forestry Research Center Chikugo Branch Present address: Fukuoka Agriculture and Forestry Research Center Institute of Agricultural and Forest Resource
  • Hirata Tomoya
    Fukuoka Agriculture and Forestry Research Center Chikugo Branch Present address: Fukuoka Prefecture Tagawa Center for the Dissemination of Improved Agricultural Methods
  • Odan Hideki
    National Agricultural Research Center for Kyushu Okinawa Region, National Agriculture and Bio-oriented Research Organization (NARO)

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Other Title
  • 水稲後作コムギにおける除草剤抵抗性スズメノテッポウの発生を低減できる浅耕播種技術を核とした総合防除
  • スイトウ アトサク コムギ ニ オケル ジョソウザイ テイコウセイ スズメノテッポウ ノ ハッセイ オ テイゲン デキル センコウハシュ ギジュツ オ カク ト シタ ソウゴウ ボウジョ

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Abstract

To control the density of herbicide-resistant water foxtail (Alopecurus aequalis), which has become more prevalent in the wheat fields of northern Kyushu, we employed a “twice shallow tillage seeding technique” as an integrated weed control system. From 2009 to 2012, we conducted field experiments in Oki, Mizuma District, Fukuoka Prefecture, to determine the effects of this technique and late seeding regarding the control of water foxtail and the enhancement of winter wheat growth. The “twice shallow tillage seeding technique” involves two rounds of shallow tillage to a depth of 0 to 5 cm, the first after the harvest of paddy rice without seeding and the second with seeding. This technique promoted the germination of water foxtail seeds buried from 0 to 5 cm and allowed for the control of emerged water foxtail using foliar applied herbicides before wheat seeding. The rates of water foxtail emergence before wheat seeding were over 170% those of the conventional seeding method at the end of November and mid-December. Compared with the levels prior to shallow tillage after the harvest of paddy rice, the number of water foxtail seeds buried from 0 to 5 cm decreased to approximately 40% by the end of November and to approximately 10% by mid-December. The number of water foxtail plants in March was reduced to 11% of that under the conventional seeding method using the “twice shallow tillage seeding technique” in conjunction with late seeding, while the number was reduced to 36% of the control using the experimental technique in conjunction with conventional seeding time. The yield of wheat under the experimental technique was equivalent to that under the conventional seeding method, and the yield under late seeding could be made equivalent to that under the conventional seeding by increasing the seeding rate. The density of herbicide-resistant water foxtail can be reduced with the combination of the “twice shallow tillage seeding technique” and late seeding while maintaining expected wheat yield levels.

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