Zobrazeno 1 - 10
of 11
pro vyhledávání: '"J. M. Blonquist"'
Publikováno v:
Kansas Agricultural Experiment Station Research Reports. 3
Publikováno v:
Agricultural Water Management. 97:1026-1038
Net radiation (Rn) is a key component of the surface energy balance, but it is expensive and difficult to measure accurately. For these reasons, Rn is often predicted in evapotranspiration (ET) calculations with a model requiring measurements of inco
Publikováno v:
Agricultural and Forest Meteorology. 149:1931-1945
Decreased water uptake closes stomates, which reduces transpiration and increases leaf temperature. The leaf or canopy temperature has long been used to make an empirical estimate of plant water stress. However, with a few supplemental measurements a
Publikováno v:
Agricultural and Forest Meteorology. 149:1709-1721
Net radiation (Rn) is the sum of the radiant energy at the Earth's surface and is a major component of the surface energy balance. However, Rn is difficult to measure accurately, and multiple instruments are available to measure it. Two new instrumen
Publikováno v:
Agricultural Water Management. 84:153-165
Instrumented weather stations are often used for evapotranspiration (ET) determination in order to estimate crop water use for irrigation scheduling. A direct estimate of crop water use by subsurface measurements of soil water content has been limite
Publikováno v:
Vadose Zone Journal. 4:1048-1058
cases salinity. However, it is sometimes the case that a new sensor is promoted and distributed only to be Performancedifferences inthe growingnumber ofelectromagnetic disapproved of years later due to poor measurement (EM) sensors designed to estima
Publikováno v:
Journal of Hydrology. 314:235-245
Time domain reflectometry (TDR) has become a standard method for determining water content in soils. However, the cost of instrumentation and the level of user-ability required often limit its application, especially for agricultural and urban soil w
Publikováno v:
Soil Science Society of America Journal. 69:1684-1690
calculated permittivity values for the sand compare reasonably well with Topp’s equation. The permittivity in the sandy loam to silt loam Of these, transmission line oscillators are particularly soils is overestimated by as much as 104 dimensionles
Publikováno v:
Vadose Zone Journal. 4:1059-1069
to e and e to v) and direct calibrations (i.e., relation of measured property to v) are used in estimating v from Transmission line-type electromagnetic (EM) methods for estimatEM signal measurements (e.g., travel time, impedance, ing soil volumetric
A Physically Derived Water Content/Permittivity Calibration Model for Coarse‐Textured, Layered Soils
Publikováno v:
Soil Science Society of America Journal. 69:1372-1378
to try and ascertain the relative importance of different soil properties for calibration. This approach has good Many empirical formulas relating TDR-measured permittivity (Ka) utilityforfindingsimpleandpracticalequationsthatcan to volumetric water