Low cost soil surface heating system with growth-stimulating and yield-increasing effects in forcing culture of strawberries in elevated beds
2020
Mizukami, K. (Fukuoka Agriculture and Forestry Research Center, Chikushino, Fukuoka (Japan)) | Sato, K. | Oku, K. | Inoue, K.
We developed the soil surface heating system for forcing culture of strawberries in elevated beds. This system consists of an electric heating wire installed in the row spacing covered by an aluminum deposition film with high heat conductance that produces a controlled crown surface temperature of 21℃. The soil surface heating system was compared with the direct crown heating system in terms of the growth and yield of strawberry, installation time of the material, and annual cost. When the soil surface heating system was controlled at 21℃, the crown surface temperature was about 4℃ lower and the medium temperature was 1-2℃ higher than that with the direct crown heating system. The growth-stimulating and yield-increasing effects of the soil surface heating system on the strawberries were similar to those of the direct crown heating system, and the total yield with both systems increased by 15% as compared to that with the system without soil surface heating. The soil surface heating system can reduce installation time by 74% and depreciate installation, electric, and annual costs by 39%, 30%, and 36%, respectively, compared to the direct crown heating system.
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