Phon khong san thi pen porapak chak tosang thualuang thi mi to kan ngok kan charoen toepto lae phonphalit thuakhieo phiu-man lae thuakhieo phiu-dam.
1991
Anan Polthanee | Sakuna Saranan
With the increased importance of incorporated crop residue into the soil multiple cropping systems, this study was conducted to determine the allelopathic potential of soybean residues on mungbean (Vigna radiata) and blackgram (vigna mungo) germination, growth and yield. Laboratory bioassays revealed that hypocotyl and radicle lengths were inhibited by aqueous extracts of soybean straw, generally more inhibitory to radicle than that of hypocotyl. The aqueous extracts had little effect on percent germination. Soybean residues were incorporated into the soil surface at different quantity 0, 30, 50 and 100 gm/pot and were studied in green-house experiment. Mungbean (Vigna radiata) showed totally inhibited germination in the presence of soybean residue at 100 gm/pot but reduced the germination of blackgram (Vigna mungo) only by 25 %. Soybean residue at the quantity of 30 and 50 gm/pot generally little effect on seedling growth but induces germination, for 2-3 days. However, at 100 gm/pot, blackgram was seriously affected by allelochemicals at seedling stage. The highest grain yield was obtained at 50 gm/pot both crop species. Blackgram is generally more tolerant to allelochemical produced from soybean residues than mungbean. The negative effect of soybean residue on crop stand establishment can apparently be overcome by a limited amount of residues that are incorporated into the soil during planting or increasing the seeding rates.
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