Lettuce plant growth and tipburn occurrence as affected by airflow using a multi-fan system in a plant factory with artificial light

文献类型： 外文期刊

第一作者： Ahmed, Hesham A.

作者： Ahmed, Hesham A.;Tong Yu-xin;Yang Qi-chang;Ahmed, Hesham A.;Tong Yu-xin;Yang Qi-chang;Ahmed, Hesham A.

作者机构：

关键词： Plant factory; Air velocity; Sensible heat; Leaf boundary layer resistance; Lettuce growth; Tipburn occurrence

期刊名称：JOURNAL OF THERMAL BIOLOGY （ 影响因子：2.902； 五年影响因子：3.102 ）

ISSN： 0306-4565

年卷期： 2020 年 88 卷

页码：

收录情况： SCI

摘要： A multi-fan system (MFS) for single culture beds was developed to improve the airflow in a plant factory with artificial light. The MFS had seven fans which were installed on both the front and back sides of culture beds to generate airflow from two opposite horizontal directions. The fans that push the air into the culture bed were air inlets while those that pull the air out of the culture bed were air outlets. In this study, three airflow patterns were evaluated: T-1, the front and back sides of the culture bed were air inlets; T-2, the front side was an air inlet and the backside was an air outlet; and T-3, both the front and back sides were air outlets. A culture bed with no MFS was used as a control (T-4). Lettuce growth and tipburn occurrence were evaluated and leaf boundary layer resistance (1/g(bv)), sensible heat flux (S-h), and latent heat flux (L-h) of lettuce plants were estimated. The airflow pattern in T-1 improved the air velocity (V-a) by an average of 0.75 m s(-1) and a variation coefficient of 65%. The 1/g(bv), decreased significantly with the increase in V-a, and the lowest value of 54.0 s m(-1) was observed in T-1. The low resistance to heat and moisture transfer enhanced the Sh and Lh of lettuce plants. The average S-h and L-h were 40% and 46% higher in T-1 compared with those in T-4. The fresh and dry weights of lettuce plants in T-1 were 1.13 and 1.06 higher than those in T-4, respectively. No tipburn occurrence was observed in lettuce plants grown under the MFS while five leaves per plant were injured with tipburn in T-4. The results indicated that improving the airflow can improve the growth of indoor cultured lettuce and alleviate the occurrence of tipburn due to the decrease in the 1/g(bv) and the increase in the transpiration rate.

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