Study of crop coefficient of asparagus
1993
Suntorn Sutassanamarlee
Consumptive use of different crops is an important data in water management. It will help improve effectiveness of water management. Besides, the crop consumptive use is also important to crop yield. Now Asparagus cultivation is expanded because of the increase in market demand on both domestic and international. This study used the first generation hybrid asparagus (F1 Brock's improve) which produces a better yield compared to other types of Asparagus. 5 months-seedling of asparagus was grown in 4 lysimeters of 1.53 m * 1.57 m * 1.50 m in size. Asparagus was also grown outside the lysimeter in the area of 15 m * 14 m to represent the environment of general cultivation. The Japanese grass was also cultivated in 4 lysimeters of 0.75 m * 0.75 m * 1.00 m in size in a nearby area. The study objective is to determine consumptive use of asparagus and compare to consumptive use of Japanese grass. The data on irrigation water, rainfall, evaporation, drainage water and soil moisture content inlysimeter were collected for calculation of the consumptive use of asparagus and Japanese grass. The study result showed that the average consumptive use of asparagus (4 - 7 months) is 4.88 millimeter per day. The average crop coefficient of asparagus (compared to Japanese grass) (Kc) is equal to 1.55. The average overall pan coefficient (compared to evaporation from class A pan) (Kp) is equal to 1.01. The average crop coefficient of asparagus (compared to potential evapotranspiration by Modified Penman) (Kcp) is equal to 0.99.
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