| 摘要 |
PURPOSE:To reduce the difference of temperature as much as possible by arranging a humidity-keeping material capable of absorbing and holding a nutritive solution in a hollow bed where plant bodies are passed through the upper plane thereof and held thereby. CONSTITUTION:When a nutritive solution is fed under pressure from a nutritive solution feeder 40 to a spraying pipe 120, the nutritive solution is sprayed to the inner space 130 of a bed (A). Although the nutritive solution feeder 40 is periodically operated, the humidity in the space 130 in an idle time is lower in comparison with that in an operation time. A humidity-keeping material 50 is used for the purpose of making up for the shortage of nutrients and the nutritive solution absorbed in the humidity- keeping material itself keeps the humidity in the space 130 in an idle time of the nutritive solution feeder 40 to a correct level. On the other hand, supporting blocks 82 function as an auxiliary unit for absorption of nutrients. That is to say, a young seedling of a plant can not absorb water or nutrients in the air in general and the supporting blocks 82 help nutrient absorption of the plants 90 by the nutritive solution absorbed and held therein. Part of the sprayed nutritive solution passes through vent holes 22 formed in a panel 20 and reaches the neighborhood of the leaves of the plants 90 also, thus supplying the nutrients and water to the leaves. |
