| 摘要 |
<p>In a tubular system for hydroponic culture,the improvement consisting in that the channel structure comprises a central core of a comparatively stiff plastics material and the sidewalls are made of a comparatively pliable plastics material, the upper edges of the sidewalls being capable of being at least partially juxtaposed. A further important improvement consists in that the surface of the bottom wall of the central core is lined with a fibrous material which offers a grasp for the seedling roots.</p> |
