Fractionation and Characterization of Humic Substance Fractions with Different Molecular Weights, Obtained from Animal Wastes

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概要

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• The humic substances contained in an animal organic waste were extracted and the total extract separated into three humic fractions with different molecular weights(low, F_1<10^3; medium, F_2, with molecular weights ranging from 10^3 to 10^4; and high, F_3>10^4). The C content was highest in F_2, the same fraction also showing the lowest N content. The molecular weight of the humic fractions influenced the electrical conductivity, the highest molecular weight resulting in the lowest degree of electrical conductivity. Membrane-controlled ultrafiltration (the method used to separate the various fractions from the whole extract) was also suitable for purifying such enzymes as phosphatase and β-glucosidase: the total activity obtained from the three fractions was considerably greater than that determined in the whole extract. Pyrolysis-gas chromatograhpy (Py-GC) applied to the whole extract and humic fractions showed that in the F_3 fraction (highest molecular weight) benzene was the major fragment while furfural was the major fragment of F_1 (lowest molecular weight). For this reason, the humification index benzene/toluene indicates that the fraction with the highest molecular weight was the most humified while the furfural/pyrrole ratio indicates that the fraction with the lowest molecular weight was the most degradable. The whole extract and the fraction F_1 had a negative effect on seed germination when the concentration was equivalent to 100 mg kg^<-1> of C, while the germination index was higher than that of the control when only 10 mg kg^<-1> were used. The F_2 fraction had a positive effect on germination regardless of the concentration used. When 10 mg kg^<-1> of C of the humic substances studied were added to the nutrient solution for growth experiments with maize plants, F_3 led to increases in root weight and F_2 led to increases in shoot weight. An inhibitor effect was observed for fraction F_1.

• 社団法人日本土壌肥料学会の論文

著者

• Garcia C

  Departamento De Qufmica Y Andlisis Agrfcola E.t.s.i. Agr6nomos U.p.m. Ciudad Universitaria

• Hernandez T

  Department Of Soil And Water Conservation And Organic Waste Management

• Herna´ndez T

  Centro De Edafologi´a Y Biologi´a Aplicada Del Segura Murcia Esp

• Garcia Carlos

  Department Of Soil And Water Conservation And Waste Management Centro De Edafologia Y Biologia Aplic

• Garcia Carlos

  Department Of Pharmacology Instituto Nacional De Pediatria

• Hernandez Teresa

  Department of Soil and Water Conservation and Organic Waste Management

• Ceccanti Brunello

  Istituto per la Chimica del Terreno, C.N.R.

• Masciandaro Grazia

  Istituto per la Chimica del Terreno, C.N.R.

• Ceccanti Brunello

  Istituto Per La Chimica Del Terreno C.n.r.

• Masciandaro Grazia

  Istituto Per La Chimica Del Terreno C.n.r.

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