Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (6): 1396-1406.DOI: 10.3969/j.issn.1004-1524.2023.06.17

• Environmental Science • Previous Articles     Next Articles

Effects of soybean root exudates on insoluble phosphorus in soil under low phosphorus stress

YANG Songhua(), SHI Guiyang, WANG Jingqin, CHEN Zhu*()   

  1. College of Agriculture, Guizhou University, Guiyang 550025, China
  • Received:2021-08-10 Online:2023-06-25 Published:2023-07-04

Abstract:

Through the nutrient solution hydroponics experiment, 10 different soybean varieties were selected to collect the root exudates under different phosphorus levels, determine the organic acid components and their secretion, and study the activation of the exudates on insoluble phosphorus in the soil. The results showed that low phosphorus stress affected the secretion of organic acids, and the total organic acid secretion of Qd11, Ax, Jd23, Jd12 and Fd increased under low phosphorus stress. The main organic acids secreted by different soybean varieties were different. Td, Cd, Qd11, Tf, Dd and Qd7 mainly secreted oxalic acid, while Ax, Jd23, Jd12 and Fd mainly secreted tartaric acid. The activation effect of soybean secretion on four kinds of insoluble phosphorus was Ca-P>Al-P>O-P>Fe-P; Under low phosphorus stress, Jd23 had the best activation effect on Al-P, with activation rate of 32.39%. Qd7 has the best activation effect on Fe-P, with activation rate of 12.60%, followed by Qd11, with 11.81%. Qd11 has the best activation effect on O-P and Ca-P, with activation rate of 32.69% and 41.73% respectively. The secretion of malic acid was significantly correlated with the dissolution of Fe-P, and the secretion of succinic acid was significantly positively correlated with the dissolution of calcium and phosphorus. Low phosphorus stress affected the secretion of organic acids in soybean roots and the activation of soil insoluble phosphorus. The organic acids secreted by soybean were mainly oxalic acid and tartaric acid. On the whole, the secretions of Qd11 and Qd7 had better activation effect on the four insoluble phosphorus.

Key words: soybean, low phosphorus stress, root exudate, organic acid, insoluble phosphorus

CLC Number: