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本文采用池栽形式,以露地栽培为对照,对地膜覆盖栽培(以下简称覆膜)大白菜的吸肥特性进行了研究.结果表明:覆膜对大白菜植株养分最大吸收量影响不大,N、P_2O_5、K_2O、CaO、MgO平均比对照增加3.3%,但后期分配于球叶中的较多,5种元素平均增加24.0%,与覆膜大白菜干物质积累过程一致;覆膜大白菜经济系数较高,单位产量养分吸收量明显低于对照区;大白菜不同生育期土壤水解氮含量与植株吸氮强度成反比趋势,其中又以覆膜区较明显.
In this paper, the cell culture and the field cultivation were used as a control to study the absorption characteristics of Chinese cabbage under plastic film mulching cultivation.The results showed that the film had little effect on the maximum nutrient uptake of Chinese cabbage, N , P_2O_5, K_2O, CaO and MgO increased by 3.3% on average compared with the control, but more in the late distribution in the leaf, the average increase of five elements 24.0%, consistent with the dry matter accumulation process of covered Chinese cabbage; The coefficient of nutrient uptake per unit yield was significantly lower than that of the control plot. The content of soil hydrolyzable nitrogen in different growth stages of Chinese cabbage was inversely proportional to the nitrogen absorption intensity of plant, especially in the plastic film zone.