Effects of trifluralin and chlorpropham application on wild oat (Avena fatua) seedling emergence and survival under various tillage regimes
2009
Asai, M., National Agricultural Research Center, Tsukuba, Ibaraki (Japan) | Yogo, Y.
A factorial experiment was conducted to evaluate the effect of different patterns of tillage and pre-emergence herbicides on wild oat emergence and survival under outdoor conditions. Seedlings were raised in concrete pots. The experiment simulated natural scarification and typical cropping patterns of winter cereals to produce various wild oat seedling recruitment pattern and emergence depths. Effects of trifluralin and chlorpropham application on numbers of emerging and surviving plants were analyzed with the generalized linear model. The wild oat emergence flush occurred in mid-October in the summer-no-till treatment, and in late November and February in the summer-till treatment. No wild oat plants emerging before early November survived, due to pre-planting treatments. Tillage patterns and herbicide application had significantly interactive effects on wild oat. Trifluralin suppressed wild oat in summer-tilled condition more than under no-till conditions, whereas chlorpropham suppressed plants under no-till conditions. Our results indicate that summer no-till enhances early wild oat emergence and reduce later emergence after winter cereal seeding. Chlorpropham mainly suppressed wild oat plants germinating near the soil surface. Thus, co-application of trifluralin and chlorpropham is expected to enhance wild oat control.
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