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以水耕法试验表明,不结球白菜营养液的氮素浓度因不同品种及生育期而异。苗期,早熟耐热的“矮杂一号”,最适的氮素浓度为8me/1,而中熟耐寒的“矮杂二号”则为8—12me/1。生长盛期,两品种均以12me/1为最适。营养元素吸收比例也随生育期的不同而变化:苗期的N:P:K为8:3.5:5.8;生长期为12:4:6.6。植株对硝态氮的吸收浓度(n/w)随溶液中硝态氮浓度的增加而增加。单株日平均耗水量:苗期为30—35ml;生长期为110—120ml;当单株重达200克左右时最大值可达190ml。
Hydrological test showed that the non-heading cabbage nutrient solution nitrogen concentration varies with different varieties and growth period. Seedling, precocious heat “dwarf hybrid”, the optimum nitrogen concentration of 8me / 1, while the maturing cold “dwarf miscellaneous” is 8-12me / 1. Growing period, both varieties are 12me / 1 for the most appropriate. The nutrient absorption rate also varies with the growth period: N: P: K in seedling stage is 8: 3.5: 5.8; the growth stage is 12: 4: 6.6. The concentration of nitrate nitrogen (n / w) increased with the increase of nitrate concentration in solution. The average daily water consumption per plant: seedling 30-35ml; growing period of 110-120ml; when the weight of about 200 grams when the maximum up to 190ml.