<i>Water and Olsen-P distribution as affected by phosphate fertilizer types and emitter discharge rates from a point source</i>

2021 ◽  
Author(s):  
Zhen Wang ◽  
Yanhong Guo ◽  
Jiusheng Li
Keyword(s):  
Point Source ◽  
Phosphate Fertilizer ◽  
Olsen P ◽  
Discharge Rates ◽  
P Distribution ◽  
Emitter Discharge

scholarly journals Experimental and Numerical Analysis of Drip Tape Layout for Irrigation of Sugarcane in Latosol

2015 ◽  
Vol 9 (1) ◽  
pp. 265-271 ◽  
Author(s):  
Kai Huang ◽  
Desuo Cai ◽  
Jinchuang Jinchuang ◽  
Wei Pan
Keyword(s):  
Point Source ◽  
Soil Water ◽  
Drip Irrigation ◽  
Water Movement ◽  
Discharge Rate ◽  
Single Point ◽  
Critical Parameters ◽  
Irrigation Uniformity ◽  
Emitter Discharge ◽  
Soil Water Movement

A laboratory soil column experiment was first conducted to analyze water movement in latosol of sugarcane field under drip irrigation from single-point source at different emitter discharge rates. Next, a mathematical model of soil water movement under drip irrigation from single-point source was built using Hydrus-3D, which could accurately simulate the shape of the wetted soil volume and the distribution of volumetric water content in the experiment. Further, a Hydrus- 3D model of soil water movement under drip irrigation from double-point source was built and then used to analyze the effects of critical parameters on irrigation uniformity. Results showed that emitter spacing affected irrigation uniformity greatly, but emitter discharge rate did not. According to the irrigation uniformity, project cost and operational management patterns, appropriate drip tape parameters for irrigation of sugarcane in latosol were determined: emitter discharge rate 1.38 L/h, emitter spacing 30 cm, and single-emitter irrigation volume 9.0 L.

Temperature Effects on Emitter Discharge Rates

1976 ◽  
Vol 19 (4) ◽  
pp. 0690-0692 ◽  
Author(s):  
Peter Parchomchuk
Keyword(s):  
Temperature Effects ◽  
Discharge Rates ◽  
Emitter Discharge

XRMF applications of a monolithic, polycapillary, focusing x-ray optic

1996 ◽  
Vol 54 ◽  
pp. 240-241
Author(s):  
D. A. Carpenter ◽  
Ning Gao ◽  
G. J. Havrilla
Keyword(s):  
Trace Elements ◽  
Point Source ◽  
Focal Spot ◽  
Fluorescence Analysis ◽  
X Rays ◽  
Focal Distance ◽  
Spot Diameter ◽  
X Ray ◽  
Focal Spot Diameter

A monolithic, polycapillary, x-ray optic was adapted to a laboratory-based x-ray microprobe to evaluate the potential of the optic for x-ray micro fluorescence analysis. The polycapillary was capable of collecting x-rays over a 6 degree angle from a point source and focusing them to a spot approximately 40 µm diameter. The high intensities expected from this capillary should be useful for determining and mapping minor to trace elements in materials. Fig. 1 shows a sketch of the capillary with important dimensions.The microprobe had previously been used with straight and with tapered monocapillaries. Alignment of the monocapillaries with the focal spot was accomplished by electromagnetically scanning the focal spot over the beveled anode. With the polycapillary it was also necessary to manually adjust the distance between the focal spot and the polycapillary.The focal distance and focal spot diameter of the polycapillary were determined from a series of edge scans.

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