经过分析我国北方各地的水质，指出了北方地区配制营养液用水中的超标元素及其浓度，并比较了营养液、基质和土壤对ＰＨ变化的缓冲能力的大小。在此基础上，探讨了在北方硬水地区配制营养液应采取的措施及适宜的无土栽培系统，供无土栽培生产者参考 After analyzing the water quality of the northern part of our country, we pointed out the excessive elements and concentrations of the nutrient solution in the northern area, and compared the buffer capacity of nutrient solution, matrix and soil to the PH change. On this basis, the measures to be taken to prepare nutrient solution in hard water areas of North China and suitable soilless cultivation systems were discussed for reference to soilless culture producers