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Table 1

Physical characteristics and nutrient contents of the three types of GM

Growing media typeGM IGM IIGM III
ZinCoblend-SIEagle Lake rooftop media blendSOPRAFLOR I
Composition High-quality recycled materials and minerals, enhanced with high-quality compost Peat moss, fir bark fines, compost, sand, pumice and perlite Pumice, sand, vegetable compost, perlite, and blond peat mixed with highly porous mineral aggregate 
Average particle size D50 (mm) 3.75 0.85 1.75 
Dry density (g/cm30.84 0.99 0.75 
Field capacity (%) 38.28% 48.70% 41.92% 
TNa (mg/kg) 239.40 819.00 259.80 
TPb (mg/kg) 130.80 96.80 190.60 
Growing media typeGM IGM IIGM III
ZinCoblend-SIEagle Lake rooftop media blendSOPRAFLOR I
Composition High-quality recycled materials and minerals, enhanced with high-quality compost Peat moss, fir bark fines, compost, sand, pumice and perlite Pumice, sand, vegetable compost, perlite, and blond peat mixed with highly porous mineral aggregate 
Average particle size D50 (mm) 3.75 0.85 1.75 
Dry density (g/cm30.84 0.99 0.75 
Field capacity (%) 38.28% 48.70% 41.92% 
TNa (mg/kg) 239.40 819.00 259.80 
TPb (mg/kg) 130.80 96.80 190.60 

aTN: total nitrogen.

bTP: total phosphorus.

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