Water requirements of subsurface drip-irrigated faba bean in California |
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Authors: | Email author" target="_blank">David?R?BrylaEmail author Gary?S?Ba?uelos Jeff?P?Mitchell |
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Institution: | (1) Water Management Research Laboratory, USDA-ARS, 9611 S. Riverbend Ave., Parlier, CA, 93648, USA;(2) Kearney Agricultural Center, University of California, 9240 S. Riverbend Ave., Parlier, CA, 93649, USA |
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Abstract: | A 3-year study was done in central California to determine the water requirements for growing faba bean (Vicia faba L.) as a winter cover crop using subsurface drip irrigation (SDI). Water was applied at 0, 50, and 100% of the estimated crop evapotranspiration (ETc) the first 2 years and 50, 100, and 150% ETc the third year, with drip laterals installed 0.30, 0.45, or 0.60 m deep. Rainfall was above normal the first year (>330 mm) and irrigation had no effect on crop production. Irrigation improved production and water-use efficiency the following years, however. Production was higher when drip laterals were located at 0.30 or 0.45 m than at 0.60 m depth, even though roots tended to be concentrated near the laterals (later in the season) regardless of depth. Overall, well-irrigated faba bean required 231-297 mm of water to produce 3.0-4.4 t haу of dry vegetative biomass. |
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