关键词: 潮土, 潮土, 氮肥, 环境安全, 玉米, 产量

Abstract: To screen out high- quality, low- accumulation Chinese cabbage varieties adapted to lead and cadmium combined contaminated soil, 15 Chinese cabbage varieties were planted in four kinds of lead and cadmium combined contaminated soil, the effects of heavy metals on the growth of various varieties were determined by measuring the plant height and fresh weight of each cabbage; the lead and cadmium content were determined by atomic absorption spectrometry; the vitamin C content was determined by 2,6- dichlorophenol indophenol titration method; the nitrate content was determined by salicylic acid method and the soluble protein content was determined by Coomassie Brilliant Blue G- 250 method. Results of the pot experiments revealed that with the increase of lead and cadmium concentration, the plant height and edible fresh weight of Chinese cabbage increased first and then decreased. And the effects of heavy metal lead and cadmium on different Chinese cabbage varieties were different. With the aggravation of combined lead and cadmium stress, the content of lead and cadmium in the edible parts of the 15 varieties increased. Under mild pollution treatment, there was no significant difference in Cd content among the varieties, the lowest Pb content was found in‘Yihekuaicai1269’, followed by that of‘Cuinenpiaoerbai’, which was 0.05 and 0.06 mg/kg, respectively. However, the nitrate content of‘Yihekuaicai1269’exceeded the standard, while that of ‘Cuinenpiaoerbai’ was relatively low. Under moderate pollution treatment, only Pb and Cd of ‘Yihekuaicai1269’did not exceed the standard, but its nitrate content exceeded the standard. Under severe pollution treatment, there was no cabbage variety that met the requirements. Under the mild pollution treatment, the determination of vitamin C content and soluble protein content of cabbage found that the Vc content of‘Cuinenpiaoerbai’was the second, and the soluble protein content was the third, so it was a relatively high quality Chinese cabbage variety. ‘Cuinenpiaoerbai’is a low- accumulation, high- quality Chinese cabbage variety that is suitable for planting in light lead-cadmium combined contaminated soil.