Effect of application of condensed liquid made from sweetpotato [Ipomoea batatas] shochu distiller waste on emergence of upland weeds

We studied the inhibitory effect of condensed liquid made from sweetpotato shochu distiller waste on the growth of upland weeds. We first seeded soil-filled containers with Digitaria ciliaris (Retz.) Koeler and Amaranthus patulus Bertoloni and then applied a condensed liquid made from sweetpotato sh...

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Veröffentlicht in:Bulletin of the National Agricultural Research Center for Kyushu Okinawa Region (Japan) 2007-03 (48)
Hauptverfasser: Kobayashi, T.(National Agricultural Research Center for Kyushu Okinawa Region, Koshi, Kumamoto (Japan)), Adachi, K, Suzuki, T
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Sprache:jpn
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Zusammenfassung:We studied the inhibitory effect of condensed liquid made from sweetpotato shochu distiller waste on the growth of upland weeds. We first seeded soil-filled containers with Digitaria ciliaris (Retz.) Koeler and Amaranthus patulus Bertoloni and then applied a condensed liquid made from sweetpotato shochu distiller waste to the soil surface in quantities of 0, 80, 160, 400, and 800mL/square m. Emergence of the weeds was significantly inhibited by the 800mL/square m application. It seems that the inhibitory effect on weed emergence was likely to be affected by germination-inhibiting compounds contained in shochu distiller waster. Twenty-eight days after applying this condensed liquid, counts of emerged weeds decreased for the application of 800mL/square m compared with the control. Specifically, the counts of Digitaria ciliaris (Retz.) Koeler were 70% and those of Amaranthus patulus Bertoloni were 44% of the control. Some seedlings of Amaranthus patulus Bertoloni died after emergence, suggesting that the condensed liquid also inhibits growth in some species of weed. After application of the condensed liquid, the number of weed seedlings gradually increased for 28 days. It seems that the inhibition on weed emergence gradually decreased with time. Growth of the weed seedlings increased in proportion to the application dosage of condensed liquid because the condensed liquid also contains nutritional fertilizer elements. The condensed liquid did not control weed emergence as well as chemically synthesized herbicides.
ISSN:1346-9177