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  • 1
    Electronic Resource
    Electronic Resource
    Effect of gypsum, pressmud, fulvic acid and zinc sources on yield and zinc uptake by rice crop in a saline-sodic soil (1980)
    Springer
    Plant and soil 55 (1980), S. 17-24 
    Details
    ISSN: 1573-5036
    Keywords: Amendments ; Fulvic acid ; Gypsum ; Pressmud ; Saline-sodic soils ; Zinc diffusion ; Zinc uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The application of fulvic acid to a saline-sodic soil augmented the solubility of zinc by thousands fold. Zinc fulvate when applied at levels equivalent to that of zinc sulphate was more effective in enhancing diffusion of zinc in the soil. Application of gypsum, zinc sulphate and fulvic acid significantly increased dry matter yield and uptake of zinc by rice crop in a saline-sodic soil. Application of gypsum with pressmud or with fulvic acid and zinc sulphate resulted in significantly higher yield and zinc uptake than in other treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02149704
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  • 2
    Electronic Resource
    Electronic Resource
    Properties of poultry litter humic acid fractions and their metal-complexes (1981)
    Springer
    Plant and soil 63 (1981), S. 439-448 
    Details
    ISSN: 1573-5036
    Keywords: Coordinate-covalent bond ; Elemental composition ; Electrovalent bond ; Humic acid ; IR spectra ; Metal complexes ; Poultry litter ; PLHA ; UV spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Molecularly homogenous fractions of humic acid extracted from poultry litter were characterized by elemental and functional group analysis, molecular weight determination, U.V. and infrared spectroscopy. The divalent and trivalent metal complexes prepared from different fractions of humic acid were characterized by infrared spectroscopy. The molecular weight of molecularly homogenous fractions of poultry litter humic acid ranged from 2545 to 40219. High amounts of functional groups in low molecular weight of humic acid fraction has been indicated by infrared spectra and by chemical analysis. The presence of chromophores C=C and C=O and auxochromes C−OH, C−NH were indicated by infrared and U.V. spectra of these humic acid fractions. Stable complex formation of Fe3+, Cu2+, and Zn2+ with −OH, −NH2 and −COOH ligands of humic acid fractions involved electrovalent and coordinate-covalent bonds. Intensity of absorption bands of molecularly homogenous fractions of humic acid in I.R. spectra is differing depending upon the functional groups content of humic acid fractions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370043
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