Abstract：Abstract：To elucidate the impact of zinc oxide nanoparticles（ZnONPs）on the growth and quality of
green garlic，‘Pizhoubaisuan’，the predominant cultivar of green garlic in Xuzhou，was utilized as the test material．ZnONPs were applied to the foliar surface of green garlic at concentrations of the treatments were as follows：50 mg · kg-1（S1），100 mg · kg-1（S2），200 mg · kg-1（S3），and 500 mg · kg-1（S4），with deionized water sprayed as the control（CK）．The results demonstrated that foliar application of zinc oxide nanoparticles facilitated the growth and enhanced the quality of green garlic．The plant height，leaf width，pseudostem length，and pseudostem thickness exhibited increases of 7% to 16%，6% to 19%，1% to 24%，and -2% to 12%，respectively，in the S1 to S4 treatments relative to CK．The fresh and dry weight of the leaf and stem increased by 1% to 12%，4% to 11% and 5% to 16%，4% to 10%，respectively．Additionally，the yield increased by 3% to 11%，respectively．The concentrations of chlorophyll a，chlorophyll b，chlorophyll a+b，and carotenoids exhibited notable increases，ranging from 32% to 74%，39% to 111%，33% to 76%， and 6% to 18%，respectively．The concentrations of VC，soluble protein，soluble sugar，free amino acid，allicin，and nitrate reductase activity were found to be elevated by 8% to 22%，19% to 31%，15% to 43%，8% to 17%，18% to 39%，and 9% to 65%，respectively．The concentrations of N，P，K，Fe，Ca，and Zn were found to have increased signifi cantly，by 9% to 21%，3% to 11%，28% to 39%，3% to 23%，9% to 23%，and 41% to 121%，respectively．The combined evaluation values of the CK，S1，S2，S3，and S4 treatments were 0.18，0.50，0.67，0.77，and 0.53，respectively．The results demonstrated that the foliar spraying of 200 mg · kg-1 ZnO nanoparticles（S3）was the optimal treatment，exhibiting the best growth and quality of green garlic．
