本研究採用阿公店水庫淤泥與稻殼，其中將稻殼作為可燒失材，以不同比例與水庫淤泥混合後，經由轉動造粒技術製作雙層、多孔、保水且具有足夠強度之顆粒介質。同時，量測顆粒介質之充氣孔隙度、容器容水量、總體密度、點壓強度及筒壓強度等，以期能符合理想栽培介質之物理條件，並探討殼層比例、心材比例和燒結溫度對顆粒介質物理性質之影響，且與市售之發泡煉石及珍珠石比較彼此物理性質之優劣。
理想栽培介質之物理性質為充氣孔隙度10%~50%；容器容水量20%~60%；總體密度0.3 g/cm3~0.75 g/cm3。而本研究所燒製之顆粒介質，其充氣孔隙度介於37%~41%；容器容水量介於3%~28%；總體密度介於0.4 g/cm3~0.9 g/cm3。本研究之27種顆粒介質中，以S05-C01-T900與S05-C01-T1000最符合理想栽培介質之物理性質，且其強度及保水力皆遠高於發泡煉石及珍珠石。

Reservoir sludge and rice husk, which can be burned at higher temperatures, are utilized to manufacture various porous spherical media with dual layers. By using different shell ratio, core ratio and furnace temperature in manufacturing, spherical media with high water holding capacity and sufficient strength were produced. The physical properties of the spherical media with dual layers were measured to verify if they can be regarded as ideal growing media. Also, the effects of shell ratio, core ratio and furnace temperature on the physical properties of spherical media are evaluated and compares to those of LECA and perlite.
The physical properties of ideal growing media are: the air-filled porosity is 10% to 50%, the container capacity is 20% to 60%, and the bulk density is 0.3 g/cm3 to 0.75 g/cm3. Based on the experimental results conducted here, it is found that the physical properties of the spherical media manufactured in this study are: the air-filled porosity is 37% to 41% , the container capacity is 3% to 28% , and the bulk density is 0.4 g/cm3 to 0.9 g/cm3. Hence, two of the twenty-seven spherical media produced in this study, S05-C01-T900 and S05-C01-T1000, whose container capacity and strength are higher than LEAC and perlite, can be regarded as ideal growing media because of their promising physical properties.

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