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Effect of Zero Drainage Using Drainage Zero Sensor on Root Zone Environment, Growth and Yield in Tomato Rockwool Culture  

Hwang, Yeon-Hyeon (Gyeongnam Agriculture Research & Extension Services)
An, Chul-Geon (Gyeongnam Agriculture Research & Extension Services)
Chang, Young-Ho (Gyeongnam Agriculture Research & Extension Services)
Yoon, Hae-Suk (Gyeongnam Agriculture Research & Extension Services)
An, Jae-Uk (Gyeongnam Agriculture Research & Extension Services)
Shon, Gil-Man (Gyeongnam Agriculture Research & Extension Services)
Rho, Chi-Woong (Gyeongnam Agriculture Research & Extension Services)
Jeong, Byoung-Ryong (Depatment of Horticulture, Division of Applied Life Science, Graduate School of Gyeongsang National University)
Publication Information
Journal of Bio-Environment Control / v.21, no.4, 2012 , pp. 398-403 More about this Journal
Abstract
This study was carried out to investigate the effect of irrigation method adopted for reducing nutrient solution drainage on the root zone environment, growth and yield of a tomato crop grown in a rockwool medium. The irrigation control methods used were large quantity irrigation at a long interval controlled by only an integrated solar radiation sensor (standard), medium quantity irrigation at a medium interval (zero drainage 1), and small quantity irrigation at a short interval (zero drainage 2) controlled by both an integrated solar radiation sensor and a zero drainage sensor. The amount of the nutrient solution supplied and the drain percentage per plant of the standard, zero drainage 1, and zero drainage 2 were 1.4, 0.9 and 0.8 L, and 23.8, 8.6 and 3.7%, respectively. The average, minimum, and maximum water contents and EC of the standard, zero drainage 1, and zero drainage 2 were 64.5~88% and $1.5{\sim}3.5dS{\cdot}m^{-2}$, 40.3~76.0% and $2.5{\sim}4.0dS{\cdot}m^{-2}$, and 56.3~69.0% and $2.7{\sim}3.7dS{\cdot}m^{-2}$, respectively. There was no difference in leaf width, number of leaves, and stem diameter among the treatments. However, plant height and leaf length decreased in the zero drainage 1 and 2 treatments as compared to the standard. The fruit marketable yield per 10a in the zero drainage 1 and 2 treatments was about 93 and 88%, respectively, of that in the standard treatment.
Keywords
EC; drainage percentage; water content;
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