硅肥与硒肥施用对水稻吸收积累Cd的影响规律研究

Influence Rule of Single Fertilization of Si or Se on Uptake and Accumulation of Ca by Rice

采用盆栽试验,研究了铅锌冶炼污染区土壤中基施硅肥和硒肥,对栽种的水稻不同生育期各器官内Cd含量的影响。研究结果表明:施硅肥和硒肥能抑制水稻对Cd的吸收,同时也能抑制根系吸收的Cd向茎叶转移。早稻金优974和晚稻金优297施加硅肥后糙米中Cd含量低于国家标准,稻米中的Cd得到理想控制,硅肥可以作为土壤改良剂控制稻米Cd污染;但基施硒肥的控制效果欠佳。

Effect of single fertilization of Si or Se on Cd content in various organs of rice of different growth stages was analysed by pot experiment with soils collected from Pb and Zn smelting pollution area.The results showed that：Si and Se fertilizer could suppress the absorption of Cd in rice,and also could suppress Cd transferring from the roots to stems and leaves.After using silicon fertilizer,the Cd content in early rice Jinyou 974 and late rice Jinyou 297 were below the national standard.So Si fertilizer could be used as soil conditioner for controlling Cd pollution of rice.But Se fertilizer was ineffective to reduce the Cd pollution.