米ぬか混和・太陽熱併用処理によるネコブセンチュウ防除および土壌微生物相に与える影響
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本研究では，露地における米ぬか混和・太陽熱併用処理のネコブセンチュウに対する効果を検討した．その結果，植物体の成長および収量が良く，最もネコブセンチュウに対する防除効果が高い処理法は，1重被覆・米ぬか混和併用処理であった．太陽熱処理単独，米ぬか混和・太陽熱併用処理の土壌微生物に及ぼす影響を調査した結果では，両処理とも糸状菌数の低下が認められたが，後者では緩和された．また線虫密度に関しても，前者ではネコブセンチュウだけでなく，自活性線虫に対しても影響が強いが，後者ではやや緩和された．以上のことからオクラのネコブセンチュウ防除において最も有効な処理法は1重被覆・米ぬか混和処理であると考えられた．In this study the effect of use of rice bran together with solar heat treatment in the fields on southern root-knot nematode that is one of the important parasite on okra is examined. As a result, the treatment having most effectiveness on controlling the nematode and on the plant growth and on the yield was the combination of the single covering and rice bran mixture method. The effect of single treatment with solar heat and using rice bran and solar heat in combination on the micro flora in soil showed that fungi decreased in number on both treatments but the effect was relieved by the combinational treatment. As for the nematode density, the single solar heating had a strong influence on free-living nematodes as well as on southern root-knot nematode but it was alleviated by the combination. From the results mentioned above, it is conceivable that the best control method of southern root-knot nematode infested on okra is combination method of single covering and rice bran treatments.
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