|Author:||Ayars, J. E.|
|Book Group Author:||NA|
A replicated field trial was conducted on the west side of the San Joaquin Valley, California, USA, to determine the crop coefficient and water requirements of irrigated garlic. Irrigation systems used included simulated furrow irrigation, subsurface drip irrigation, and surface drip irrigation. Irrigation levels were set at 50, 75, 100, and 125% of crop evapotranspiration (ETC) measured with a weighing lysimeter. Field plots consisted of four beds 80 m long and a 1 m wide, with the two inside beds used for experimental purposes and the outside beds as buffers. Irrigation scheduling was controlled by the crop lysimeter using ETC threshold values: 1 mm for the subsurface drip irrigation, 2 mm for the surface drip irrigation, and a weekly irrigation equal to the accumulated ETC for the simulated furrow irrigation treatment. The crop water use at 100% ETC for the interval 1 March to 21 May 2006 was 426 mm, including 108 mm of rainfall. The irrigation schedule was modified to reflect the rainfall contribution during the experimental period. An asymptote was used to relate yield to the applied water and the total water use. Maximum yield occurred at 100% ETC, and irrigation in excess of 100% ETC did not provide any additional yield. Statistically, there was very little difference in the yield parameters and quality parameters when compared across irrigation system types. Statistical differences occurred between the irrigation levels. Peak crop coefficient values were estimated in the range of 1.3 to 1.4. The KC was linearly related to the day of the year. This represents the development segment of the crop coefficient curve as described in FAO Irrigation and Drainage Paper 56.
|Pages:||1683 - 1688|
|Journal:||Transactions of the ASABE|
crop yield, evapotranspiration, furrow irrigation, garlic,irrigation scheduling, plant water relations, subsurface irrigation,trickle irrigation, water requirements, water use efficiency,California, USA, Allium sativum, Allium, Alliaceae, Liliaceae, Liliales,monocotyledons, angiosperms, Spermatophyta, plants, eukaryotes, PacificStates of USA, Western States of USA, USA, North America, America,Developed Countries, OECD Countries, United States of America,Horticultural Crops (FF003) (New March 2000), Plant Water Relations(FF062), Plant Production (FF100), Soil Water Management (Irrigation andDrainage) (JJ800) (Revised June 2002) [formerly Soil Water Management]