College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
J Zhejiang Univ Sci B. 2017;18(10):897-905. doi: 10.1631/jzus.B1600272.
Cadmium (Cd) contamination in soil is an increasingly serious problem. Management of plant nutrients has been proposed as a potentially promising strategy for minimizing Cd accumulation in crops grown in contaminated soil. This study investigated the effects of split applications of nitrogen (N) fertilizers on the Cd concentration in Chinese cabbage (Brassica chinensis L.) plants grown in Cd-contaminated soil. Compared with single applications, split applications of ammonium or urea resulted in significantly lower Cd concentrations, and higher biomass production and antioxidant-associated nutritional quality in the edible plant parts. However, when nitrate was used as the N fertilizer, there were no significant differences between the split and single applications for the same parameters. We conclude that a split application could be more beneficial than a single application method when ammonium or urea is used as the N fertilizer for vegetable cultivation in Cd-contaminated soil.
土壤中的镉（Cd）污染是一个日益严重的问题。管理植物养分被认为是一种有希望的策略，可以最大限度地减少在受污染土壤中生长的作物对镉的积累。本研究调查了在镉污染土壤中种植的白菜（ Brassica chinensis L. ）植株中氮（N）肥分次施用对镉浓度的影响。与单次施用相比，铵态氮或尿素的分次施用显著降低了 Cd 浓度，同时增加了可食用植物部分的生物量和与抗氧化剂相关的营养品质。然而，当硝酸盐用作 N 肥料时，对于相同参数，分次施用和单次施用之间没有显著差异。我们得出结论，当铵态氮或尿素用作 N 肥料时，与单次施用相比，分次施用更有利于在镉污染土壤中种植蔬菜。
