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  • FLUID MECHANICS AND HEAT TRANSFER  (2)
  • Potassium  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Influence of different fertilizers on nett gain or loss of soil nitrogen in long-term manure and fertilizer applications (1980)
    Springer
    Plant and soil 57 (1980), S. 159-165 
    Details
    ISSN: 1573-5036
    Keywords: Crop rotations ; Fertilizers ; Lime ; Manures ; Nitrogen ; Nutrient ; Phosphorus ; Potassium ; Removal ; Weedicide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The nett gain or loss of total soil nitrogen was worked out from a long-term manure and fertilizer experiment conducted for seven years and still continuing at Ranchi Agricultural College, Kanke, Ranchi India. The total nitrogen in soil showed a deficit balance where lower and unbalanced doses of fertilizers were applied. Increasing levels of fertilizer combinations with lime removed the highest amount of nitrogen in intensive cropping. The nett loss was highest (95 kg/ha) in case of control, at 100% NPK the nett gain was 37 kg N per ha, and at 150% NPK 72 kg N per ha which was the highest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02211675
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Balance sheet of soil phosphorus and potassium as influenced by intensive cropping and fertilizer use (1981)
    Springer
    Plant and soil 60 (1981), S. 187-193 
    Details
    ISSN: 1573-5036
    Keywords: Fertilizer ; Intensive cropping ; Lime ; Multiple cropping ; Manure ; Nutrient removal ; Nitrogen ; Phosphorus ; Potassium ; Weedicide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The balance sheet of phosphorus and potassium were worked out from a long term manure and fertilizer experiment conducted for eight years and is still continuing at Ranchi Agricultural College, Kanke, Ranchi, India. Increasing levels of fertilizer combination with organic manure and lime give the highest yield as well as removed the highest amount of phosphorus and potassium from the soil and gave the positive gain of soil phosphorus and potassium in intensive cropping. The highest gains of 59.0 and 278.0 kg/ha of phosphorus and potassium respectively were recorded in 150% NPK application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374103
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Prediction of jet mean flow structure in support of HSCT noise suppression concepts (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The paper describes the application of techniques based on computational fluid dynamics to the simulation of jet flowfields. A solution code for the Reynolds-averaged Navier-Stokes equations is supplemented by conventional two-equation turbulence models based on the Boussinesq approximation. The axisymmetric SCIPVIS code is enhanced with the PARCH and CRAFT codes to examine plug-jet flowfields and imperfectly expanded axisymmetric free round jets. The sensitivity of shock/boundary layer interactions is observed in simulations of the plug case, and the adaptive gridding in the disk region and turbulence levels generated at the triple point are identified as areas in the Mach case that require improvement. Jet-wave structure in the region beyond the first several shock cells can be predicted, and turbulence modeling can be undertaken with respect to improving compressibility, length scale, vorticity, and energy budget. The mean flow structure of imperfectly expanded jets can be studied to develop related noise suppression concepts for the High-Speed Civilian Transport (HSCT).
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 91-2253
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Implicit/explicit analysis of interactive phenomena in: supersonic, chemically-reacting, mixing and boundary layer problems (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An efficient implicit/explicit procedure for solving the parabolized Navier-Stokes (PNS) equations to analyze supersonic, viscous, chemically-reacting flows is presented. The approach combines a fully-implicit algorithm for solving the parabolic mixing/boundary layer equations with an explicit algorithm for determining the hyperbolic pressure field. The unified model, SPLITP, contains provisions for treating bounding/embedded subsonic regions using a pressure-splitting procedure which suppresses elliptic (upstream influence) effects without recourse to sublayer approximations. Several two-equation turbulence models with compressibility and curvature-correction terms are incorporated into SPLITP. Applications to a variety of flow problems are presented which include: ducted supersonic mixing and combustion flowfields, free jets and plumes, and, curved boundary layers and wall jets.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 85-1717
    Format: text
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    NASA TECHNICAL REPORTS
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