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以油菜为试材,采用田间小区试验方法,研究了单一稀土La,Ce叶面喷施对同一土壤条件下、不同季节(春季和秋季)油菜产量和营养品质的影响,以期为单一轻稀土农用提供理论依据。结果表明:不同季节种植油菜其营养品质存在明显差异,秋季油菜可溶性糖和维生素C含量较高,可滴定酸和硝酸盐含量较低,糖酸比较高,而春季则相反;La,Ce处理促进春秋两季油菜茎叶干、鲜物重增加,增加干鲜比,增幅大小为Ce处理>La处理;La,Ce处理增加油菜茎叶中可溶性糖含量,降低可滴定酸含量,增加糖酸比,其中春秋两季分别以Ce和La处理作用明显;同时降低油菜茎叶中的维生素C和硝酸盐的含量,其中春秋两季分别以La和Ce处理作用明显;La,Ce处理降低油菜茎叶中的重金属Cu,Zn,Cd,Pb,Ni等元素的含量,降幅大小为Ce处理>La处理。
Taking rapeseed as test material and field plot test method, the effects of single rare earth La and Ce foliar application on yield and nutritional quality of rape in different seasons (spring and autumn) under the same soil conditions were studied, Provide a theoretical basis. The results showed that the nutrient quality of rapeseed was significantly different in different seasons. The content of soluble sugar and vitamin C in autumn rape was higher, the contents of titratable acid and nitrate were lower, the ratio of sugar and acid was higher, In spring and autumn, the stems and leaves of the rape were dry, the fresh weight increased, and the ratio of dry to fresh increased, the increasing range was Ce treatment> La treatment. La and Ce treatments increased the content of soluble sugar in stems and leaves of rapeseed, decreased the titratable acid content, , In which the treatments of Ce and La were significant respectively in spring and autumn, while the contents of vitamin C and nitrate in stems and leaves of rapeseed were decreased. The effect of La and Ce treatment was obvious in spring and autumn. In the content of heavy metals such as Cu, Zn, Cd, Pb, Ni and other elements, the decrease of the size of Ce treatment> La treatment.