Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (20): 81-88.doi: 10.11924/j.issn.1000-6850.casb2022-0169

Special Issue: 生物技术 园艺

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Effects of Nitrogen Application on Amino Acid Content in Rhizosphere of Sugar Beet at Different Development Stages

DU Shengnan(), PAN Hengyan, XING Qinan, ZHANG Ailing, WANG Qiuhong()   

  1. College of Modern Agriculture and Ecological Environment, Heilongjiang University, Harbin 150080
  • Received:2022-03-09 Revised:2022-05-23 Online:2022-07-15 Published:2022-08-23
  • Contact: WANG Qiuhong E-mail:842319855@qq.com;wangqiuhong119@126.com

Abstract:

The content of amino acid in the rhizosphere soil could change under nitrogen application. In this study, the changes of amino acid content in the rhizosphere soil at different development stages of sugar beet after nitrogen application were determined and analyzed, one sugar beet variety with high organic nitrogen absorption efficiency and one with low organic nitrogen absorption efficiency were selected, and nitrogen application (N: 150 mg/kg) and no nitrogen application (N: 0 mg/kg) were set up. Rhizosphere and non-rhizosphere soils were collected at seedling stage, leaf cluster rapid growth stage, root sugar accumulation stage and harvest stage, and the contents of amino acids were determined by high performance liquid chromatography (HPLC). The results showed that the content of total amino acid increased with the growth of sugar beet in the four stages, and the variation range was from 1194.9 to 1375.63 mg/kg, but there were differences in the changes of various amino acids. The total amount of amino acid nitrogen in the fertilized soil was 117.35 mg/kg higher than that in the unfertilized soil. The largest increase was neutral amino acid, with an average increase of 91.56 mg/kg. The amino acid mineralization of ‘KWS8138’ (high nitrogen absorption efficiency variety) was 63.76 mg/kg higher than that of ‘Beta176’ (low nitrogen absorption efficiency variety). The ratio of amino acids in rhizosphere soil was significantly affected by the growth of beet, while the change of amino acids outside the rhizosphere soil was not significant. The change of amino acid content in rhizosphere soil was greater than that in non-rhizosphere soil. The application of nitrogen fertilizer increased the content of amino acid nitrogen in the soil, thus improving the sustainable nitrogen supply capacity of the soil.

Key words: nitrogen application, sugar beet, amino acid, rhizosphere, non-rhizosphere

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