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  • 1
    Electronic Resource
    Electronic Resource
    The effect of different irrigation treatments on yield and quality of Verna lemon (1989)
    Springer
    Plant and soil 120 (1989), S. 299-302 
    Details
    ISSN: 1573-5036
    Keywords: fruit quality ; irrigation ; leaf water potential ; lemon ; soil water potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Verna lemon trees were irrigated by six different treatments: five flood and one drip. Soil and plant water status, yields and fruit quality were measured. The drip-irrigated treatment gave higher yield and fruit size. The levels of soluble solids, acidity and sugars in the lemon juice decreased in the treatments that used most water. This is explained by a dilution effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02377080
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Seasonal variations on water relations ofAmygdalus communis L. under drip irrigated and non irrigated conditions (1988)
    Springer
    Plant and soil 106 (1988), S. 215-220 
    Details
    ISSN: 1573-5036
    Keywords: almond ; daily courses ; leaf conductance ; leaf water potential ; hysteresis ; water stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Almond plants (Amygdalus communis L.) of the Garrigues variety were grown in the field drip irrigated and rainfed. Leaf water potential (Ψ) and leaf conductance (g1) were determined throughout one growing season. Pre-dawn measurement for Ψ in the irrigated treatment was consistent through the growing season, whereas in the rainfed treatment it decreased gradually. Ψ values at midday (Ψ minimum) was closely dependent on atmospheric evaporative demand, and their recovery was quicker in the wet treatment than in the dry. The g1 values were higher in the wet than dry treatments, decreasing in both cases by leaf ageing. Maximum values for g1 were reached when evaporative demand was highest in the day. The relationship between Ψ and g1 revealed a decrease in the hysteresis throughout the growing season, being most marked in the dry treatment. The results highlight the close dependence of Ψ and g1 on evaporative demand, leaf ageing and irrigtion treatment during the growing season.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02371216
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Stomatal response to leaf water potential in almond trees under drip irrigated and non irrigated conditions (1988)
    Springer
    Plant and soil 112 (1988), S. 151-153 
    Details
    ISSN: 1573-5036
    Keywords: almond ; leaf conductance ; leaf water potential ; water stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Almond plants (Amygdalus communis L. cv. Garrigues) were grown in the field under drip irrigated and non irrigated conditions. Leaf water potential (Ψ) and leaf conductance (g1) were determined at three different times of the growing season (spring, summer and autumn). The relationships between Ψ and g1 in both treatments showed a continuous decrease of g1 as Ψ decreased in spring and summer. Data from the autumn presented a threshold value of Ψ (approx. −2.7 MPa in dry treatment, and approx. −1.4 MPa in wet treatment) below which leaf conductance remained constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181765
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  • 4
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    Tidal estimation in the Atlantic and Indian Oceans, 3 deg x 3 deg solution (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An estimation technique was developed to extrapolate tidal amplitudes and phases over entire ocean basins using existing gauge data and the altimetric measurements provided by satellite oceanography. The technique was previously tested. Some results obtained by using a 3 deg by 3 deg grid are presented. The functions used in the interpolation are the eigenfunctions of the velocity (Proudman functions) which are computed numerically from a knowledge of the basin's bottom topography, the horizontal plan form and the necessary boundary conditions. These functions are characteristic of the particular basin. The gravitational normal modes of the basin are computed as part of the investigation; they are used to obtain the theoretical forced solutions for the tidal constituents. The latter can provide the simulated data for the testing of the method and serve as a guide in choosing the most energetic functions for the interpolation.
    Keywords: OCEANOGRAPHY
    Type: NASA-TM-87812 , REPT-87B0163 , NAS 1.15:87812
    Format: application/pdf
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  • 5
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    A method of calculating the total flow from a given sea surface topography (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Using a simple dynamical model of a wind-driven ocean circulation of the Stommel type, and an analytical basis developed to objectively analyze the sea surface height residuals from an altimeter and, in the process, to determine the total flow instead of just the near surface geostrophic component associated with the given sea surface topography. The method is based on first deriving the solution to the forced problem for a given wind stress required to develop a hypothetical true or perfect data field and to establishing the basis for the objective analysis. The stream function and the surface height field for the forced problem are developed in terms of certain characteristic functions with the same expansion coefficients for both fields. These characteristic functions are simply the solutions for a homogeneous elliptic equation for the stream function and the solutions of an inhomogeneous balance equation for the height field. For the objective analysis, using a sample of randomly selected height values from the true data field, the height field characteristic functions are used to fit the given topography in a least squares sense. The resulting expansion coefficients then permit the synthesis of the total flow field via the stream function characteristic modes and the solution is perfectly well behaved even along the equator. The method of solution is easily adaptable to realistic ocean basis by straight forward numerical methods. The analytical basis of the theory and the results for an ideal rectangular basin on a beta plane are described.
    Keywords: OCEANOGRAPHY
    Type: NASA-TM-87799 , REPT-87B0128 , NAS 1.15:87799
    Format: application/pdf
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  • 6
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    Objective analysis of tidal fields in the Atlantic and Indian Oceans (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An objective analysis technique has been developed to extrapolate tidal amplitudes and phases over entire ocean basins using existing gauge data and the altimetric measurements which are now beginning to be provided by satellite oceanography. The technique was previously tested in the Lake Superior basin. The method has now been developed and applied in the Atlantic-Indian ocean basins using a 6 deg x 6 deg grid to test its essential features. The functions used in the interpolation are the eigenfunctions of the velocity potential (Proudman functions) which are computed numerically from a knowledge of the basin's bottom topography, the horizontal plan form and the necessary boundary conditions. These functions are characteristic of the particular basin. The gravitational normal modes of the basin are computed as part of the investigation, they are used to obtain the theoretical forced solutions for the tidal constituents, the latter provide the simulated data for the testing of the method and serve as a guide in choosing the most energetic modes for the objective analysis. The results of the objective analysis of the M2 and K1 tidal constituents indicate the possibility of recovering the tidal signal with a degree of accuracy well within the error bounds of present day satellite techniques.
    Keywords: OCEANOGRAPHY
    Type: NASA-TM-87773 , NAS 1.15:87773 , REPT-86B0195
    Format: application/pdf
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  • 7
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    Tidal estimation in the Pacific with application to SEASAT altimetry (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The techniques for computing the eigenfunctions of the velocity potential (Proudman functions) set out in Sanchez, et al. (1986) in relation to the Atlantic-Indian Oceans are here applied to the Pacific Ocean, using a 6x6 degree grid of 510 points (455 points for the associated stream functions). Normal modes are computed from the first Proudman functions and have natural periods from 43.9h downward. Tidal syntheses are derived from these modes by direct application of the (frictionless) dynamic equations and by least-squares fitting of Proudman functions to the dynamically interpolated tide-gauge data of Schwiderski (1983). The modes contributing the most energy to the principal harmonic tidal constituents are different in the two computations: their natural periods are typically in the range of 9 to 16h for semidiurnal, and 14 to 43h for diurnal tides. The rms of fit for the Proudman functions is, in all cases, better than the corresponding value for the same number of spherical harmonics.
    Keywords: OCEANOGRAPHY
    Type: NASA-TM-100694 , REPT-88B0061 , NAS 1.15:100694
    Format: application/pdf
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