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  • Articles  (8)
  • 1990-1994  (2)
  • 1975-1979  (6)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (6)
  • Technology  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Rapid microdetermination of silicon in rice plant (1975)
    Springer
    Plant and soil 42 (1975), S. 491-494 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A direct method of estimation of silica in rice plant tissues is reported. This involves the digestion of finely ground plant samples with concentrated nitric acid in corning-glass conical flasks followed by dissolution in Na2CO3 in stainless-steel beakers; the plant silica is thereby converted into molybdenum reactive form which is estimated colorimetrically. This method represents an improvement over the time consuming fusion procedure followed ordinarily and also dispenses with use of platinumware. re]19740501
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010025
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of silica-supplying power of soils for growing rice (1977)
    Springer
    Plant and soil 47 (1977), S. 487-494 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Laboratory incubation and pot culture experiments conducted with five laterite, two red, two alluvial and one calcareous black, rice-growing soils showed that the power of extraction of silica both from dry and wet soils was in the descending order 0.2 N HCl, 0.025 M citric acid, N NaOAc at pH 4 and distilled water. Flooding increased the silica extracted by these four extractants which reached a peak in 20 days after which there was either no change or a slight decrease during the next forty days. The silica content and uptake in the crop was low in all except the black soil. The silica content of the dry-season crop was higher than that of the wet-season crop possibly because of more favourable climatic conditions prevailing during dry season which enhanced absorption. Correlation studies between silica extracted by different solutions both in dry and flooded soils and content and uptake of silica by the rice plant indicated that 0.025 M citric acid was the best extractant which could be used in the evaluation of the silicon supplying power of rice soils. re]19761012
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011505
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  • 3
    Electronic Resource
    Electronic Resource
    Heterosis in rice hybrids (1990)
    Springer
    Euphytica 49 (1990), S. 243-247 
    Details
    ISSN: 1573-5060
    Keywords: hybrid rice ; cytoplasmic genetic male sterile line ; fertility restorer ; heterosis ; heterobeltiosis ; standard heterosis ; stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary One hundred and thirtysix hybrids were developed utilizing four cytoplasmic genetic male sterile lines (V 20A, Zhen Shan 97A, IR 46829A and IR 46830A) and 34 effective restorers. Heterosis, heterobeltiosis and standard heterosis were found to be significant for grain yield and other yield attributing characters in most of the hybrids. The heterosis for grain yield was mainly due to the significant heterosis for the number of spikelets per panicle, test weight and total dry matter accumulation. Interestingly, it was found that most of the higher yielding hybrids were accompanied by significant negative heterosis for harvest index. Hybrids shorter than the shortest parent and earlier than the earliest parent were not observed; hybrids with intermediate to tall plant height having nonlodging habit could be developed. Eighteen hybrids gave more than 20% grain yield than the standard checks. These were evaluated for their stable and consistent yield performance over four seasons. The results on analysis for stability parameters indicated that the hybrids V 20A × Himdhan and Zhen Shan 97A × Mahsuri were stable over environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00036295
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  • 4
    Electronic Resource
    Electronic Resource
    Phosphorus transformations from rock phosphates in acid soils and measures for increasing their efficiency for growing rice (Oryza sativa L.) (1978)
    Springer
    Plant and soil 49 (1978), S. 449-459 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Laboratory incubation experiments showed that addition of rock phosphate to P-deficient acid red and laterite soils resulted in an increase in Al−P or/and Fe−P, with a consequent decrease in Ca−P during 15 days, of moist aerobic incubation. The transformations of P from Gafsa, Jordan, North Carolina and Florida rock phosphates were more than those from Tennessee, Missouri and Udaipur. Studies with North Carolina, Gafsa, and Udaipur rock phosphates showed that application of the former two to moist aerobic P-deficient acid soils 2 weeks prior to flooding and transplanting rice gave higher content of Al−P, Fe−P and Bray-P, compared to when these were applied at flooding. The grain yields obtained with the former two treatments were also at par with that obtained with the addition of superphosphate at comparable rate (100 ppm) of P application, compared to when the, rock phosphates were applied at flooding, where the grain yields were lower than the superphosphate treatment, indicating that some of these rock phosphates could be made as efficient as superphosphate for growing rice on acid soils by their application to moist aerobic soil, 2–3 weeks prior to flooding and transplanting rice and thus conserve some amount of sulphur required for the manufacture of water soluble phosphates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02183273
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  • 5
    Electronic Resource
    Electronic Resource
    Efficiency of HCl- and H2SO4- acidulated rock phosphates for rice (Oryza Sativa L.) on acid soils (1978)
    Springer
    Plant and soil 50 (1978), S. 575-584 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Rock phosphates from Udaipur (India), North Carolina, Florida, Tennessee and Missouri (USA) were acidulated with HCl or H2SO4, to the extent of 25, 50, 75 or 100 per cent of the requirement for complete conversion into single superphosphate. Partial acidulation resulted in the formation of a mixture of water- and citrate-soluble and -insoluble phosphates, the proportion of the first two increasing with increasing degree of acidulation, at the expense of the insoluble phosphate. For a given degree of acidulation, the P compounds formed with HCl or H2SO4 were of comparable composition, except that the HCl-acidulated products were hygroscopic. Pot experiments with acid P-deficient soils showed that the behaviour of the HCl- or H2SO4- acidulated products in respect of P availability in soil, grain yield response and P uptake by rice was more or less similar. Partially acidulated rock phosphate to the extent of 50 per cent with either of the acids was found to be suitable for growing rice under flooded soil conditions. There is thus scope for the use of HCl- acidulated rock phosphate as a substitute for the H2SO4- acidulated product, for growing rice in acid soils. The scope for use of lower degree HCl-acidulated product in an upland crop — rice rotation in acid soils is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02107210
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  • 6
    Electronic Resource
    Electronic Resource
    Efficiency of HCl- and H2SO4- acidulated rock phosphates for rice (Oryza Sativa L.) on acid soils (1978)
    Springer
    Plant and soil 50 (1978), S. 575-584 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Rock phosphates from Udaipur (India), North Carolina, Florida, Tennessee and Missouri (USA) were acidulated with HCl or H2SO4, to the extent of 25, 50, 75 or 100 per cent of the requirement for complete conversion into single superphosphate. Partial acidulation resulted in the formation of a mixture of water- and citrate-soluble and -insoluble phosphates, the proportion of the first two increasing with increasing degree of acidulation, at the expense of the insoluble phosphate. For a given degree of acidulation, the P compounds formed with HCl or H2SO4 were of comparable composition, except that the HCl-acidulated products were hygroscopic. Pot experiments with acid P-deficient soils showed that the behaviour of the HCl- or H2SO4- acidulated products in respect of P availability in soil, grain yield response and P uptake by rice was more or less similar. Partially acidulated rock phosphate to the extent of 50 per cent with either of the acids was found to be suitable for growing rice under flooded soil conditions. There is thus scope for the use of HCl- acidulated rock phosphate as a substitute for the H2SO4- acidulated product, for growing rice in acid soils. The scope for use of lower degree HCl-acidulated product in an upland crop — rice rotation in acid soils is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02107210
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Optimum design of stiffened cylindrical panels with constraint on the frequency in the presence of initial stresses (1976)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 10 (1976), S. 283-299 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper presents the optimum design of stiffened cylindrical panels with weight as the objective function and constraints on the frequencies in the presence of initial stresses, using unconstrained minimization techniques of non-linear mathematical programming problem. The interaction between the buckling constraints and the frequency constraints in the presence of initial stresses are included in the formulation. Loss of load carrying capacity due to imperfection and due to suddenly applied loads are included in the buckling analyses. Results for cylindrical shell are obtained by setting the panel angle to 360 degrees. The relationship between the weight of the cylinder and the panel (a segment of the cylinder) is examined.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620100205
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  • 8
    Electronic Resource
    Electronic Resource
    Singularity in structural optimization (1993)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 36 (1993), S. 931-944 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Singularity conditions that arise during structural optimization can seriously degrade the performance of the optimizer. The singularities are intrinsic to the formulation of the structural optimization problem and are not associated with the method of analysis. Certain conditions that give rise to singularities in linear elastic structures have been identified in earlier papers, along with a proposition to alleviate the consequences of their presence.1-3 These singularities were global in nature, encompassing the entire structure. Further examination revealed more complex sets of conditions in which singularities occur. Some of these singularities are local in nature, being associated with only a segment of the structure. Moreover, the likelihood that one of these local singularities may arise during an optimization procedure can be much greater than that of the global singularity identified earlier. This paper provides examples of these additional forms of singularities. It gives a framework in which these singularities can be recognized. In particular, the singularities can be identified by examination of the stress-displacement relations along with the compatibility conditions and/or the displacement-stress relations derived in the integrated force method of structural analysis. Methods for the elimination of the effects of these singularities are suggested and numerical illustrations are given.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620360604
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