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Evaluation of herbicide systems in minimum tillage and conventional tillage peanuts arachis hypogaea



Evaluation of herbicide systems in minimum tillage and conventional tillage peanuts arachis hypogaea



Weed Science 38(3): 243-248



Field experiments were conducted from 1985 to 1987 to evaluate herbicide systems for minimum-tillage and conventional-tillage peanut production. While acceptable weed control could be achieved in both tillage systems, minimum-tillage systems generally had to be more herbicide intensive. Preemergence or preplant-incorporated within-the-row applications of either ethalfluralin and pendimethalin plus postemergence applications of paraquat and sethoxydim provided Texas panicum [Panicum texanum] control equivalent to preplant-incorporated applications of ethalfluralin or pendimethalin. Early-postemergence paraquat applications improved Florida beggarweed [Desmodium tortuosum] and pitted morningglory [Ipomoea lacunosa] control in conventional-tillage systems at least 15% compared to the same systems without paraquat. Control of bristly starbur [Acanthospermum hispidum] and sicklepod [Cassia obtusifolia L.] in conventional-tillage systems did not increase with paraquat application. Broadleaf weed control did not differ between tillage systems, except pitted morningglory control was lower in the minimum-tillage system. Conventional-tillage peanuts produced yields 800 to 1900 kg/ha higher, depending on herbicide system, and also provided greater net returns than minimum-tillage peanuts. The greater yield and net returns in conventional- versus minimum-tillage systems were not attributed to weed control or disease problems.

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