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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

فعّال (مزود البيانات قام بتقديم البيانات الوصفية السنة الماضية)
Journal Article

مقال مجلة

Assessing the reliability of permanganate-oxidizable carbon as an index of soil labile carbon  [2004]

Tirol-Padre, A.; Ladha, J.K.;

استعراض النص الكامل

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Soil C oxidized by neutral KMnO4, or permanganate-oxidizable C (POC), has been used as an index of labile C by several workers, although the nature of organic C (OC) oxidized has not been well elucidated. This study aimed to determine the reactivity of diverse organic compounds found in the soil with KMnO4 to judge the reliability of POC as an index of labile C. Sugars, amino acids, and other organic acids reacted slowly with 33 mM KMnO4 (2-45% C oxidized in 1 h), while compounds containing glycol groups (e.g., ascorbic acid and pyrogallol) were oxidized quickly by KMnO4 (25% C oxidized in 1 min). Permanganate did not oxidize cellulose, which is decomposed by soil microbial enzymes. The POC of organic manures and plant residues was positively correlated with lignin content. The rates of oxidation of SOM with KMnO4 varied among different rice (Oryza sativa L.) soils and were highly correlated with total soil C. The clay + silt/OC ratio negatively affected POC rendering physical protection for oxidizable C groups. In the soil, KMnO4 more rapidly oxidized less readily available organic compounds than the water-soluble carbohydrates, indicating that it did not discriminate the nonlabile from labile C. Soil POC was better correlated with total C (P < 0.01) than with water-soluble C (WSC) (P < 0.05) and was not correlated with microbial biomass C (MBC). Carbon oxidized by KMnO4 is not a reliable measure of labile C and should be referred to as POC when used as a
parameter for characterizing soil C.
المجلة
Soil Science Society of America journal
الرقم التسلسلي المعياري الدولي (ردمد) : 0361-5995

معلومات ببليوغرافية

اللغة:
English
النوع:
Journal Article
في أجريس منذ:
2013
المجلد:
68
الإصدار:
3
صفحة البداية:
969
صفحة النهاية:
978
جميع العناوين:
"Assessing the reliability of permanganate-oxidizable carbon as an index of soil labile carbon"@eng
مسائل أخرى:
"Includes references"
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معلومات ببليوغرافية

اللغة:
English
النوع:
Journal Article
في أجريس منذ:
2013
المجلد:
68
الإصدار:
3
صفحة البداية:
969
صفحة النهاية:
978
جميع العناوين:
"Assessing the reliability of permanganate-oxidizable carbon as an index of soil labile carbon"@eng
مسائل أخرى:
"Includes references"