JP6906787B2 - 土壌改良剤及び土壌改良方法 - Google Patents
土壌改良剤及び土壌改良方法 Download PDFInfo
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- JP6906787B2 JP6906787B2 JP2017069701A JP2017069701A JP6906787B2 JP 6906787 B2 JP6906787 B2 JP 6906787B2 JP 2017069701 A JP2017069701 A JP 2017069701A JP 2017069701 A JP2017069701 A JP 2017069701A JP 6906787 B2 JP6906787 B2 JP 6906787B2
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Description
<実施例1(低分子キチン)>
土壌は、静岡県焼津市並びに榛原郡吉田町の農業生産法人2社の圃場から採取したものを等重量ずつ混合したもの使用した。混合土壌は風乾後、2ミリ角メッシュの篩にかけ、篩を通過した土壌を用い、最終水分量が最大容水量の60%になるように滅菌水を加え、併せて低分子量キチンが水分調整後の土壌に対し質量換算で0.1%になるよう加え、良く混合した。混合土壌は、乾熱滅菌した200mL容ガラス瓶の8割容量まで添加し、瓶口部をパラフィルムで封をした後、培養機にて温度25℃で保温した。保温開始後、2週間後に土壌を採取し、微生物数を測定した。
実施例1における土壌サンプル作成にて、低分子量キチンを添加せず、その他の手順は実施例1と同様にして処理を実施した。
実施例1における土壌サンプル作成にて、低分子量キチンの代りにキチン (カニ由来) を添加し、その他の手順は実施例1と同様にして処理を実施した。
放線菌の菌数をエッグアルブミン寒天培地、フザリウム菌の菌数をFOG1寒天培地を用いて計数した。培地組成と操作、結果を以下に記す。
(i)エッグアルブミン寒天培地
培地原料:エッグアルブミン 0.25g、グルコース 1.0g、K2HPO4 0.5g、MgSO4・7H2O 0.2g、Fe2(SO4)3 0.01g、寒天 15.0g、蒸留水 1,000mL、pH 6.8
エッグアルブミン寒天培地は、細菌及び放線菌の培地であるが、放線菌コロニーは一般に堅く、表面が粉状を呈するものが多く、且つ寒天中に菌糸を伸展するため、他の細菌群と区別でき、放線菌の計数に一般的に使用されている。
培地原料:K2HPO4 1.0g、KCl 0.5g、MgSO4・7H2O 0.5g、クエン酸水素2アンモニウム 2.0g、H3BO3 0.5g、硝酸エコナゾール 5.0mg、trace element A * 0.2mL、クロラムフェニコール 0.25g、寒天 20g、蒸留水 1,000mL
* trace element A(95mL当り):クエン酸 5.0g、FeSO4 5.0g、ZnSO4・7H2O 1.0g、CuSO4 0.5g、MgSO4・5H2O 50mg、Na2MoO4 50mg
FOG1寒天培地は、フザリウム菌の選択培地である。
土壌10gを滅菌水90mLに入れ、30分間振盪した後、懸濁液を滅菌水で10倍ごとに希釈した。
(i) 放線菌
放線菌数の菌数測定結果を下記表1に示す。
フザリウム菌の菌数の測定結果を下記表2に示す。なお、各処理区とも保管開始時の菌数を100%とし、それと比較した2週間後の菌数割合(残存率)を百分率で示した。また、無処理区の残存率を100%とした、低分子量キチン、キチン処理区の残存率を併せて示した。この結果を下記表2に示す。
(i)低分子量キチン濃度とフザリウム菌低減率との関係
低分子量キチン濃度とフザリウム菌低減率との関係は、(a) キチンが放線菌やフザリウム菌を含む真菌類の栄養源であること、(b) 低分子量キチンのフザリウム菌低減効果は濃度依存的であると判断されること、(c) 微生物は普遍的に指数関数的な増減挙動をとること、の3点より、図1に示されるような指数近似曲線を描くことが出来ると考えられる。
土壌病原菌であるフザリウム菌を短期間で低減することが実用上有益であることから、低分子量キチンの施用効果は、フザリウム菌を半減することが好ましく、1桁以上低減することがより好ましい。当該条件に値する低分子量キチンの土壌への施用濃度の下限は、図1から、好ましくは0.02%(w/w土壌)以上、更に好ましくは0.06%(w/w土壌)以上と算出される。
低分子量キチンは不溶性成分で自体の固体化が可能な物質であり、且つそれ自体がキノコ等の食用にも栽培される真菌の栄養源として使用可能である。上記で考察の通り、低分子量キチンのフザリウム菌低減効果は濃度依存的であると判断されるため、科学的に効果発揮に要する上限濃度は無い。
キチンは窒素を含有する多糖類であり、構造中のアセトアミド基由来の窒素が6.9%程度含まれる。農作物栽培において、窒素の過剰施用は作物の濃度障害を引き起こし、また環境汚染の原因となることが知られている。日本では農地含む土地の地力増進を目的に地力増進法において、土壌窒素分の改善目標が示されている。その内、窒素含有量の上限値が示されて対象地は、水田のみである。その値を下記表3に抜粋して示す。
表3に示す含水土壌中の窒素含有量の上限と、低分子量キチンに由来する窒素量が同一となる低分子量キチン濃度は、0.17%と算出される。このことから低分子量キチンの施用は好ましくは0.17%以下と考えられる。算出例を下記表4に示す。
Claims (4)
- キチンを分解して得られる低分子量キチンを、土壌中の含有量が0.02質量%以上となるように、土壌に添加することを特徴とする土壌中のフザリウム菌低減方法。
- 前記低分子量キチンの数平均分子量が2,000〜50,000である、請求項1記載の土壌中のフザリウム菌低減方法。
- 前記低分子量キチンを土壌に添加することにより、土壌中の放線菌を増加させ、フザリウム菌を減少させる、請求項1又は2記載の土壌中のフザリウム菌低減方法。
- 前記低分子量キチンを、土壌中の含有量が0.06質量%以上0.17質量%以下となるように、土壌に添加する、請求項1〜3のいずれか1項に記載の土壌中のフザリウム菌低減方法。
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