Zobrazeno 1 - 10
of 34
pro vyhledávání: '"Darrell W. DeBoer"'
Autor:
Dwayne Beck, Darrell W. DeBoer
Publikováno v:
Journal of Irrigation and Drainage Engineering. 132:47-54
The 340,000 ha Lake Dakota Plain area in north-central South Dakota has the topographical and soil characteristics required for the use of combination subsurface drainage and irrigation systems. Corn yield data from a research site and a county-wide
Autor:
Darrell W. DeBoer
Publikováno v:
Journal of Irrigation and Drainage Engineering. 128:137-146
A laboratory investigation was conducted to measure wetted radii and drop sizes and to estimate the energy characteristics of a rotating spray-plate sprinkler. Maximum wetted radii were positively related to increasing sprinkler elevation above an ir
Publikováno v:
Journal of Irrigation and Drainage Engineering. 127:272-276
Water application characteristics of a very low pressure spray sprinkler (40kPa), a low pressure spray sprinkler (100 kPa), a medium pressure impact sprinkler (170 kPa), and a high pressure impact sprinkler (345 kPa) were evaluated under field condit
Autor:
Darrell W. DeBoer, S. T. Chu
Publikováno v:
Journal of Irrigation and Drainage Engineering. 127:234-239
Previous simulation studies dealing with surface runoff use mathematical models based on a single soil infiltration relationship to estimate the influence of irrigation application depths and rates on surface runoff depths. Soil infiltration is influ
Autor:
Darrell W. DeBoer, Peter F. Ffolliott, James T. Fisher, Timothy E. Fulbright, Menachem Sachs, Jeffrey O. Dawson
Publikováno v:
Journal of Arid Environments. 39:155-163
The International Arid Lands Consortium was established in 1990 to promote research, education, and training for the development, management, restoration, and reclamation of arid and semi-arid lands throughout the world. One activity of the Consorium
Autor:
Dwayne Beck, Darrell W. DeBoer
Publikováno v:
Soil and Tillage Research. 23:111-123
Surface runoff can be a problem when water application rates of continuously moving sprinkler irrigation machines exceed the infiltration capability of soil. The problem is aggravated with reduced sprinkler pressure operating conditions. Field studie
Autor:
Shu Tung Chu, Darrell W. DeBoer
Publikováno v:
Transactions of the ASAE. 19:0478-0481
BI-LEVEL drainage refers to a subsurface drainage system where drains are at two different depths on an alternating basis. DeBoer and Chu (1972) developed a theoretical formula to describe the fall of a water table under such a drainage condition. Th
Publikováno v:
Energy in Agriculture. 2:51-59
Engineers from Minnesota, North Dakota and South Dakota were involved in irrigation pumping plant efficiency tests during 1978, 1979 and 1980. Performance characteristics were determined for 249 electric powered plants. The average operational effici
Publikováno v:
Applied Engineering in Agriculture. 3:174-177
A chemical tracer was used to measure drift patterns downwind from a lateral with low pressure sprinklers mounted at a 4 m height. The larger droplets from irrigation sprinklers are suggested for causing the relatively short downwind drift zone. Howe
Autor:
Robert A. Kohl, Darrell W. DeBoer
Publikováno v:
Transactions of the ASAE. 27:1836-1840
DROPLET distributions are presented for a 360 deg spray nozzle with nozzle sizes ranging from 4.8 to 9.5 mm and pressure ranging from 50 to 200 kPa. Smooth and serrated spray plates were also used. The geometry of the spray plate surface is the domin