氮素水平对娃娃菜栽培基质微生物数量、酶活性及养分含量的影响

方案选用尿素26 g/株、硫酸钾38 g/株、普通过磷酸钙34 g/株，有利于提高基质土壤酶活性、基质和植株中养分含量，促进植株养分向地上部运输。

关键词：娃娃菜;氮素水平;基质微生物;土壤酶;养分含量

中图分类号：S634.3;Q81     文献标志码：A     文章编号：1001-1463（2019）09-0063-10

doi：10.3969/j.issn.1001-1463.2019.09.015

Abstract：The pot experiment was conducted to study effects of different nitrogen levels on microbial quantity，enzyme activity and nutrient content in mini Chinese cabbage （Brassica pekinensis） cultivated with substrate. The results showed that with the same application of phosphorus and potassium fertilizer， with the advance of growth period， the quantity of ammoniated bacteria in the substrate of a. ambrosia cultivation decreased with the addition of urea treatment at 26 g/plant. The number of nitrifying bacteria， nitrite bacteria and denitrifying bacteria increased， and the influence of nitrogen level on the quantification of these microorganisms was not significant. Catalase activity was significantly higher under nitrogen application than that under no nitrogen application. After topdressing at lotus stage， matrix cellulase and urease had higher activity under urea application of 8 g/plant， while catalase and sucrase reached their maximum values under urea application of 36 g/plant and 16 g/plant， respectively. With the increase of nitrogen application rate， the total and available potassium contents increased first and then decreased， and reached the maximum under the treatment of urea 26 g/plant. The contents of total nitrogen， total phosphorus and total potassium in the shoot were higher than those in the underground， and reached the maximum under the treatment of 26 g/plant urea per plant. The contents of total nitrogen and total potassium were significantly higher than those under the treatment of no nitrogen application. In summary， under the condition of pot culture with substrate， the fertilization schemes of Mini Chinese cabbage include 26 g/plant urea per plant， 38 g/plant potassium sulfate per plant and 34 g/plant common superphosphate per plant， which are beneficial to improving soil enzyme activity， nutrient content in matrix and plant， and promoting nutrient transport from plant to shoot.