| 摘要 |
The humidifier consists of blocks of polyurethane foam of around 2 ml. volume, which are buried in the sown land in quantity and disposition depending on the characteristics of the species cultivated. They retain irriqation water and small amounts of air inside the cells, keeping the soil aerated and with moisture content optimum for qrowth. They can be made from industrial polyurethane foam scrap.
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