Integrated weed control of herbicide-resistant water foxtail (Alopecurus aequalis) in winter wheat in a crop rotation system using the shallow tillage seeding technique
2015
Ono, Y. (Fukuoka Agriculture and Forestry Research Center, Chikushino, Fukuoka (Japan)) | Odan, H. | Sato, H. | Odahara, K. | Hirata, T.
To control the density of herbicide-resistant water foxtail, which has recently become more prevalent in the wheat fields of Northern Kyushu, we examined an integrated weed control system that combined the use of herbicides with various culture techniques such as summer crop, seeding method, and seeding time. We examined the effectiveness of this system during crop rotation of paddy rice, wheat, and soybean. In the wheat field after the harvest of paddy rice, a decrease was observed in the water foxtail population by using a combination of the “twice shallow tillage seeding technique” and late seeding. The “twice shallow tillage seeding technique” involved three processes: first shallow tilling to a depth of 0-5 cm, control of emerging water foxtail by using non-selective herbicides before seeding, and second shallow tilling to the same depth with seeding. In the wheat field after the harvest of soybean, the number of buried water foxtail seeds at the time of wheat seeding was reduced as compared to that in the wheat field after the harvest of paddy rice. Furthermore, the water foxtail population was reduced with the “once shallow tillage seeding technique” after using non-selective herbicides. The “once shallow tillage seeding technique” involved tilling only once to a sufficiently shallow depth in order to simultaneously destroy the soybean ridges during wheat seeding. Therefore, in a farm with herbicide-resistant water foxtail, it is possible to reduce the density of water foxtail by using these prevention techniques for several years while applying herbicides that are effective against herbicide-resistant water foxtail. In addition, prevention of herbicide-resistant water foxtail in a barley field is possible by using the same technique.
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