Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (8): 39-47.doi: 10.11924/j.issn.1000-6850.casb2020-0655

Special Issue: 园艺

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Effects of Biochar-calcium Peroxide Composite Particles on Benzoic Acid Allelochemical Stress to Tomato Seedlings

Tu Yuting(), Huang Jichuan, Wu Xuena, Liao Weijie, Peng Zhiping()   

  1. Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences/Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation/Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture and Rural Affairs, Guangzhou 510640
  • Received:2020-11-13 Revised:2021-01-28 Online:2021-03-15 Published:2021-03-16
  • Contact: Peng Zhiping E-mail:sysutyt@hotmail.com;ytifei@aliyun.com

Abstract:

Allelopathy autotoxcity effect of phenolic acids has been proved to be one of the important causes of tomato continuous cropping obstacles. Development of technologies for the phenolic acids allelochemicals removal is expected to alleviate the problem of continuous cropping obstacles. In this study, blending method and coating method were employed for the preparation of biochar-calcium peroxide composite particles. The adsorption and oxidation behaviors of benzoic acid on the composite particles were studied by sequencing batch experiments. Then the particles prepared via coating method were used in hydroponics experiments, to investigated the alleviate effect on the allelopathy of benzoic acid stress to tomato seedlings over this novel composite particles. The results showed that, after 3 h of reaction, the removal rate of 100 mg/L benzoic acid could be obtained at 82.6% and 67.0% over 1.5 g/L of the particles prepared via coating method and blending method, respectively. The composite particle prepared via coating method displayed higher catalytic activity due to its better buffering capacity for the hydroxide ions generated by the decomposition of calcium peroxide. The results of hydroponic experiment showed that compared to the treatments with benzoic acid allelochemical stress, the growth indexes of tomato seedling, including individual biomass, root weight, fresh weight of stem and leaf, plant height, root length, and root activity, increased significantly in the treatment with the addition of biochar-calcium peroxide composite particles. The relative permeability of root cell membranes and the content of malondialdehyde in leaves decreased by 23.7% and 30.4%; and the leaf antioxidant enzyme activities, including superoxide dismutase and peroxidase activities, increased by 61.0% and 45.6%, respectively. Therefore, the prepared biochar-calcium peroxide composite particles could effectively reduce the concentration of benzoic acid in the cultivation medium through adsorption-oxidation reactions, reducing the physiological stress of phenolic acid on tomato seedlings and promoting its growth. These results have certain guiding significance for the development of new technologies for reducing continuous cropping obstacles.

Key words: continuous cropping obstacle, biochar, calcium peroxide, benzoic acid, allelopathy

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