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  • 1965-1969  (6)
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Materialart
Erscheinungszeitraum
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  • 1
    Digitale Medien
    Digitale Medien
    Behaviour of photosynthetic products associated with growth and grain production in the rice plant (1967)
    Springer
    Plant and soil 26 (1967), S. 333-347 
    Details
    ISSN: 1573-5036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary A study of the behaviour of the photosynthetic products assimilated at different growth stages was conducted in the field and in the greenhouse using C14 tracer. In general, the assimilated carbon is translocated to and accumulates in the growing organs. The carbon assimilated at the maximum tiller number stage is distributed mostly to the lower leaves. The carbon assimilated at the booting stage is distributed mostly to the spikelet, certain leaf sheaths and culms. The carbon accumulated in the form of carbohydrates in the leaf sheaths and the culm before flowering is retranslocated to the panicle after flowering. However, because of the consumption by respiration, the efficiency of this type of carbohydrate in grain production is not very high. The carbon assimilated after flowering accumulated mostly and efficiently in the brown rice. The release of the assimilated carbon as CO2 is most intense immediately after assimilation. Thirty-five to 60 per cent of the assimilated carbon is consumed through respiration under the conditions of this experiment. As the carbon, which is in the form of sugars, rapidly changes to other forms, and also is consumed by respiration, the consumption declines rapidly. The retention percentage of assimilated carbon decreases as mutual shading increases. The large proportion of carbon released through respiration indicates the importance of studies on the significance of respiration in relation to growth.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01880183
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  • 2
    Digitale Medien
    Digitale Medien
    Low-light-induced death of lower leaves of rice and its effect on grain yield (1966)
    Springer
    Plant and soil 25 (1966), S. 17-31 
    Details
    ISSN: 1573-5036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary and conclusion One of the common causes of the death of the lower leaves in the tropics is a deficiency in light energy. The death of leaves from light deficiency results from the weakening of the leaves as a result of a decrease in their photosynthetic capacity, poor retention of nutrients, and decomposition of proteins which results in ammonia accumulation. Rice yields decrease under mutually shaded conditions. The removal of the lower leaves is less harmful than shading them. This indicates that their death under mutually shaded conditions may be advantageous. It is obvious, however, that the use of genetic materials or cultural practices which would allow the lower leaves to function normally until the plant approaches maturity would be highly desirable. Such materials and procedures would clearly involve reduced leafiness and the harmful effects of mutual shading.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01347958
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  • 3
    Digitale Medien
    Digitale Medien
    Effect of mutual shading on dry-matter production in the tropical rice plant (1966)
    Springer
    Plant and soil 24 (1966), S. 128-144 
    Details
    ISSN: 1573-5036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01373079
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  • 4
    Digitale Medien
    Digitale Medien
    Mutual shading as a factor limiting the yield response of rice to application of nitrogen, phosphorus and potassium fertilizers (1966)
    Springer
    Plant and soil 25 (1966), S. 201-210 
    Details
    ISSN: 1573-5036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary The differences in fertilizer responses between rice plants grown under pot and field conditions were discussed. Under pot conditions, the rice plant responded more strongly to nitrogen applications at high phosphorus and high potassium levels than at low levels of these elements. This suggests that the balance of nitrogen, phosphorus, and potassium is an important factor in fertilizer application. Under field population conditions, however, mutual shading among plants limits grain yield. A big leaf area above a certain limit is associated with decreased grain yield. The response to nitrogen may be negative, and may not be changed even with the application of potassium and phosphorus.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01347819
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  • 5
    Digitale Medien
    Digitale Medien
    Copolymerization of tetraoxane with styrene catalyzed by BF3·O(C2H5)2 (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 1937-1949 
    Details
    ISSN: 0449-296X
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The copolymerization of tetraoxane with styrene catalyzed by BF3·O(C2H5)2 was studied at 30°C. to determine whether a cyclic monomer can copolymerize with a vinyl monomer. The formation of the copolymer was confirmed by elementary analysis of both benzene-soluble and benzene-insoluble fractions of the polymer obtained. It was found by gas chromatography that a fairly large amount of 4-phenyl-1,3-dioxane and a small amount of trioxane were formed in the present system, in addition to polymers. Roughly a third of the total amount of the monomers reacted was consumed in the formation of methanol-insoluble polymer, a third for 4-phenyl-1,3-dioxane, and another third for trioxane and unknown products which could not be indentified. The formation of these cyclic compounds during the copolymerization may be explained in terms of a back-biting (or intramolecular transacetalization) reaction. The cationic reactivity of tetraoxane was found to be similar to that of styrene on the basis of both the consumption rate of each monomer in the copolymerizing system and the composition of the methanol-insoluble polymer obtained.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1967.150050811
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  • 6
    Digitale Medien
    Digitale Medien
    Copolymerization of trioxane with styrene catalyzed by BF3·O(C2H5)2 (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 1927-1936 
    Details
    ISSN: 0449-296X
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: It was determined whether trioxane, a cyclic formal, can copolymerize with styrene, a vinyl monomer, in the presence of BF3·O(C2H5)2 catalyst at 30°C. The methanol-in-soluble fraction after extraction with benzene was found to contain the copolymer of styrene and trioxane, thus demonstrating that trioxane can copolymerize with styrene In this case the amount of the methanol-insoluble polymer was less than that of the total monomer consumed, as determined by gas chromatography. This was found to be caused partly by the formation of the cyclic oligomer, 4-phenyl-1,3-dioxane. The relative reactivity of styrene was qualitatively found to be larger than that of trioxane, not only from the rate of monomer consumption but also from the composition of the methanol-insoluble polymer obtained. In a nonpolar solvent the reactivity of trioxane increased, and the difference in reactivity between the two monomers decreased. Indeed, an apparent monomer reactivity ratio might be obtained from the relationship between the monomer composition and the monomer consumption rate or the composition of the methanol-insoluble polymer, but it did not have a quantitative meaning because of the complexity of the copolymerization reaction.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1967.150050810
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