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以‘早熟5号’大白菜(Beassica pekinensis L.)为试材,采用土施和叶面喷施三聚氰胺方式,观察并测定相关指标.结果表明,三聚氰胺在土壤中可发生缓慢降解,90 d后不同浓度处理(40、160和800 mg.kg-1)的土壤中三聚氰胺均有残留,分别残留21.1%、15.8%和43.6%.三聚氰胺处理浓度越高,大白菜吸收的量越大.土施试验,根中最高和最低含量分别为105.7和8.0 mg.kg-1,茎叶中为139.9和7.1 mg.kg-1,根吸收三聚氰胺后,可将其转运到地上部的茎叶中;叶面喷施试验,根中最高和最低含量分别为4.3和0.9 mg.kg-1,茎叶中为8.5和3.2 mg.kg-1.土施40 mg.kg-1三聚氰胺可增产9.8%,土施800mg.kg-1三聚氰胺减产15.9%,土施可增加叶绿素和可溶性糖含量,降低维生素C含量,叶面喷施三聚氰胺对大白菜的生长影响较小.三聚氰胺在土壤中的残留时间长,大白菜可通过根和茎叶吸收三聚氰胺,三聚氰胺可影响大白菜的生长状况.
Using the method of spraying melamine on soil and foliar, Beassica pekinensis L. was used as test material to observe and measure the relevant indexes.The results showed that melamine could degrade slowly in the soil, and after 90 d The melamine residues in soils with different concentrations (40, 160 and 800 mg.kg-1), respectively, remained 21.1%, 15.8% and 43.6%, and the higher the concentrations of melamine in the soil, the more the Chinese cabbage absorbed. In the test, the highest and lowest contents of roots were 105.7 and 8.0 mg.kg-1 respectively, and 139.9 and 7.1 mg.kg-1 in stems and leaves, respectively. After absorbing the melamine, The highest and lowest root contents were 4.3 and 0.9 mg.kg-1 in root and 8.5 and 3.2 mg.kg-1 in stems and leaves, respectively. Melamine fortified with 40 mg.kg-1 soil could increase yield by 9.8% Melamine application 800mg.kg-1 15.9% yield reduction, soil applications can increase the content of chlorophyll and soluble sugar, reduce vitamin C content, melamine sprayed leaves on the growth of Chinese cabbage less melamine in the soil residue for a long time, large Chinese cabbage can absorb melamine through roots and stems and leaves, and melamine can affect the growth of Chinese cabbage.