【作者】 艾绍英； 王美丽； 姚建武； 黄小红； 蔡永发；

【Author】 Ai Shao-ying Wang Mei-li Yao Jian-wu Huang Xiao-hong Cai Yong-fa (Soil and Fertilizer Institute, GAAS. Guangzhou 510640. China)

【机构】 广东省农业科学院土壤肥料研究所；

【摘要】 采用水培试验,研究(?)适宜于不同氮素供应条件下生长的9个菜心品种吸收矿质养分以及与硝酸盐累积的关系。结果表明,(?)营养液中只含硝态氮源时,菜心对钾、钙和氯的相对吸收量与硝酸盐累积量呈负相关关系;当营养液(?)硝铵态氮的比例为7:3时,对磷、钾、钙、镁、硫、氯、钼的相对吸收量均与硝酸盐累积呈负相关关系。进一步的分析表明,在这种氮素营养条件下,磷主要是通过改变它与全氮的吸收比例而影响硝酸盐(?)累积,而其它元素则主要是改变了它们与硝态氮的吸收比例而影响了硝酸盐的累积。说明根据不同氮(?)营养条件下矿质养分吸收与硝酸盐累积的关系,针对性地采取营养调节措施,以达到降低硝酸盐的目(?)是可行的。更多还原

【Abstract】 Solution culture experiment was conducted for studying the relation of mineral nutrients absorption and nitrate accumulation in flowering Chinese cabbage when different type of nitrogen supplied. It was indicated that the absorption of K, Ca and CL are the main influence factors to nitrate accumulation when only NO.-T-N was supplied in the nutrient solution. When the ratio of NO3--N to NH4+-N is 7:3 in the nutrient solution, the absorption of P, K, Ca, Mg, S, Cl, Mo all influence nitrate accumulation of flowering Chinese cabbage, which changes of the ratios of K, Ca, Mg, S, Cl, Mo to NO3--N and P to total N were the main reason in this nitrogen nutrition condition. It was possible to reduce nitrate content by nutrition regulation measure according to the relations of nutrients absorption and nitrate accumulation in the different nitrogen form supplied.更多还原