欢迎访问《中国农学通报》，
中国农学通报

中国农学通报 ›› 2019, Vol. 35 ›› Issue (1): 63-68.doi: 10.11924/j.issn.1000-6850.casb18070052

所属专题： 园艺

• 林学 园艺 园林 • 上一篇    下一篇

不同营养液浓度对小白菜生物量及硝酸盐含量的影响

袁 艺, 陶 婧, 汪 骞, 李石开   

  1. 云南省农业科学院园艺作物研究所
  • 收稿日期:2018-07-12 修回日期:2018-10-03 接受日期:2018-10-25 出版日期:2019-01-02 发布日期:2019-01-02
  • 通讯作者: 李石开
  • 基金资助:
    科技惠民专项（农业）“蔬菜安全高效生产与产品追溯技术集成研究及应用”(2016RA004)；云南省应用基础研究计划项目青年项目“不同 供液水平下小白菜生物量、硝酸盐积累及氮肥利用率之间的关系”(2017FD018)。

Nutrient Concentrations Affect the Biomass and Nitrate Content of Brassica campestris L.

  • Received:2018-07-12 Revised:2018-10-03 Accepted:2018-10-25 Online:2019-01-02 Published:2019-01-02

PDF (PC)

331

摘要： [目的]为明确在不影响小白菜生物量情况下,有效降低硝酸盐含量的最佳水肥供应方式,以期为实际生产中采取的经济环保且硝酸盐低残留的施肥方法提供依据。[方法]本研究以小白菜为原料,采用无土栽培,探讨不同浓度营养液对小白菜生物量、吸水量及其体内硝酸盐含量的影响。[结果]结果表明：小白菜定植10 d内,营养液浓度的改变对其生理指标没有显著影响。定植10 d后到收获,当营养液浓度＜2.4 dS/m 时,小白菜的生理指标随着营养液浓度的增加而增加；营养液浓度≥2.4 dS/m 时,营养液浓度的增加对鲜质量没有显著影响。小白菜收获时EC值≥2.4 dS/m时提高营养液浓度会显著增加小白菜体内硝酸盐的积累。小白菜的吸水量和营养液浓度呈正相关,当营养液浓度为2.4 dS/m时,小白菜的水分利用率最高。[结论]因此,在小白菜定植10 d内使用1.2 dS/m浓度的营养液进行栽培,定植10 d后营养液浓度逐渐增加至2.4 dS/m直至栽培结束,能够最大程度提高产量和水分利用率并把硝酸盐含量维持在一个较低水平。

关键词: 盐碱地, 盐碱地, 小麦-玉米, 脱硫石膏, 有机物料

Abstract: To find the best water-manure supply method of reducing nitrate content without affecting biomass of Brassica campestris L., and provide reference for the economic and environmental fertilizing method with low nitrate residue, the effect of different EC value nutrient solutions on the biomass, soakage and nitrate content of B. campestris L. was studied. The results showed that in the 10 days of field setting, the concentration of nutrient solution rarely influenced the physical indexes. After 10 days, the physical indexes increased with the increase of nutrient solution concentration below 2.4 dS/m, and it had no significant effect on fresh weight when the concentration was higher than or equal to 2.4 dS/m. The nitrate content obviously increased in harvest time when EC value was more than or equal to 2.4 dS/m. The water absorbing ability of B. campestris L. was positively correlated with the concentration of nutrient solution, and water use efficiency reached the highest under nutrient solution concentration of 2.4 dS/m. The best culture condition is: 1.2 dS/m in the first 10 days of field setting and then 2.4 dS/m instead.