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Relative effectiveness of various types and methods of zinc application on rice and maize crops grown in calcareous soil (1983)

Singh, A. P. ; Sakal, R. ; Singh, B. P.

Springer

Plant and soil 73 (1983), S. 315-322

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ISSN: 1573-5036

Keywords: Organic manures ; Residual effects ; Rice ; Yield ; Zinc application ; ZnO suspension

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Summary Application of zinc sulphate mixed with compost/poultry manure proved to be equivalent to the effect of dipping the seedling roots in 4% ZnO suspension with respect to rice yields but Zn-amended organic manures were superior to other treatments with regards to total Zn uptake. A marked residual effect of soil applied treatments was recorded on the succeeding maize crop. Application of poultry manure alone was about one and a half times more effective than compost alone in increasing the rice and maize grain yields. Poultry manure surpassed compost in increasing zinc uptake by the crops and at the same time it built up more available Zn in soil than compost for the following crop. The magnitude of yields and Zn uptake response were magnified when zinc sulphate was applied along with organic manures. Application of 25 kg zinc sulphate/ha alone had the same effect as 50 quintals poultry manure alone or 12.5 kg zinc sulphate applied with 50 quintals compost/ha with respect to crop yields. A significant positive correlation was, recorded in both the crops between Zn concentration in grain or straw and their respective yields.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02184307

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Copolymerization parameters of substituted aniline monomers (1983)

Chatterjee, S. K. ; Singh, B. P. ; Pachauri, L. S.

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 1165-1171

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ISSN: 0360-6376

Keywords: Physics ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The Kelen-Tüdös linear graphical method was used to determine the copolymerization parameters of some halogen-substituted (e.g., Cl, Br, I) aniline monomers. It was found during copolymerization with p-aminobenzoic acid or p-aminophenol that the reactivity of these monomers followed the order of their basic strength. The order of their basic strength. The order of their reactivity, however, was reversed if they copolymerized with sulfanilic acid (SA). This reversal has been interpreted in terms of the resonance stabilization of monomers, the nature of the acidic functional groups present in the comonomer, and the influence of electron-accepting or electron-donating groups present in the comonomers.

Additional Material: 1 Ill.