Conversion rate is the main indicator of measuring the
utilization efficiency. Nitrogen conversion rate (N mass utilized
by plants to N mass reduced in the hydroponic system) showed an
increase trend with the increase of dilution ratios, from 0.07 to
0.46 mg/mg. The potassium had the same trend with the range
0.02–0.51 mg/mg. In terms of nutrient solution, only 0.22 and
0.27 mg/mg for N and K were obtained