Sprinkler and Corn Canopy Effects on Water Application Characteristics
Publication: Journal of Irrigation and Drainage Engineering
Volume 127, Issue 5
Abstract
Water application characteristics of a very low pressure spray sprinkler (40 kPa), 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 conditions. Average field application rates varied from 42 to 156 mm/h and maximum 5-min application rates varied from 54 to 226 mm/h. Both were inversely related to sprinkler nozzle pressure in a manner that can be described by a logarithmic relationship. Maximum 5-min and 10-min application rates were, respectively, about 20 and 10% higher than average rates for the irrigation events. The 100, 170, and 345 kPa sprinklers produced application uniformity coefficients of 95% for single events and up to 99% for sequential events. About 70% of applied irrigation water reached the soil surface within a 200-mm diameter area at the base of corn plants. Maximum water application rates at the base of corn plants were amplified from three to four times when compared with above-canopy rates.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 127 • Issue 5 • October 2001
Pages: 272 - 276
History
Received: Aug 31, 2000
Published online: Oct 1, 2001
Published in print: Oct 2001
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