摘要
在设施菜地条件下,研究了不同有机肥的施入量(0￣60t·hm-2)在黄瓜生长期对土壤-植物系统NO3--N迁移累积的影响。结果表明,黄瓜生长期土壤-植物系统NO3--N的迁移累积规律受黄瓜生长期和有机肥施用水平的影响。盛果期,0￣40cm土壤各个土层的硝酸盐含量以及黄瓜叶片和黄瓜的硝酸盐含量均高于黄瓜生长的前期和后期;对于不同的施肥水平,当施肥量为60t·hm-2时,0￣40cm各个土层的土壤硝态氮含量均高于其他处理,且黄瓜的硝酸盐含量在黄瓜生长旺盛期超过国家安全食品标准(410mg·kg-1),当施肥量低于20t·hm-2时,0￣40cm土壤各个土层未出现硝态氮显著累积现象,且在黄瓜生长的各个时期,黄瓜的硝酸盐含量均未超标;适宜的有机肥施用量不会造成硝酸盐在土壤和植物体内的过量累积。
A field experiment with cucumber plant was conducted under protected cultivation condition to study the effects of different application rates （0-60 t·hm^-2）of organic manure on the accumulation characteristics of nitrate （NO3^--N）in soil-cucumber system. The results showed that the accumulation characteristics of NO3^--N in soil and cucumber plant were affected by the growth stage of cucumber and the application rate of organic manure. At vigorous fruiting stage, the NO3^--N content in 0-40 cm soil layer was higher than that at earlier and later growth stages, and in cucumber plant comprising lamina and cucumber the NO3^--N content was also higher than that at earlier and later growth stages. When the application rate of organic manure was 60 t·hm^-2 at vigorous fruiting stage, the NO3^--N content in 0-40 cm soil layer was the highest, and the NO3^--N content in the lamina of cucumber was the highest. Cucumber at its vigorous growth stage with 60 t·hm^-2 application rate of organic manure was surpassed the standard of China foodstuff security （410 mg·kg^-1 ）. When the application rate of organic manure was less than 20 t·hm^-2, no significant NO3^--N accumulation was observed in soil, and so did the lamina of cucumber, and the NO3^--N content in cucumber at its various growth stages was not surpassed the standard of China foodstuff security （410 mg·kg^-1）. It was suggested that appropriate application rate of organic manure could not result in an over-accumulation of NO3^--N in soil-cucumber system.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2008年第5期1831-1835,共5页
Journal of Agro-Environment Science
基金
国家科技支撑计划项目(2006BAD17B07)
中国科学院知识创新工程重要方向项目(KSCXZ-YW-N-037)
关键词
设施菜地
有机肥
硝酸盐
protected cultivation
organic manure
nitrate
