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农业生物技术学报  2021, Vol. 29 Issue (12): 2365-2374    DOI: 10.3969/j.issn.1674-7968.2021.12.010
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Efficacies of Different Soil Fumigants Against Fusarium spp. of Lettuce (Lactuca sativa) Planting Soil and Their Influences on Soil Microbial Community
CHEN Li-Da1,*, SHI Yan-Xia1,*, LI Lei1, CHAI A-Li1, GUO Ning2, FAN Teng-Fei1, XIE Xue-Wen1,**, LI Bao-Ju1,**
1 Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2 Beijing Soil and Fertilizer Workstation, Beijing 100029, China
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Abstract  With the continuous cultivation of high value-added vegetable crops in facility greenhouses, the problem of soil-borne diseases has gradually become prominent, and fumigants have also been more widely used. However, based on the broad spectrum of fumigants, while killing harmful organisms, it will inevitably have a certain impact on non-target organisms. In this experiment, qPCR technology, selective medium separation and counting methods were used to study the inhibitory effect of Dazomet, Calcium cyanamide and Metam sodium in lettuce (Lactuca sativa) planting soil on Fusarium and the influence of soil microbial community. During the harvest of lettuce, the agronomic traits and yield of the plant were measured, and the correlation analysis of the interaction between fumigant and soil microorganisms was carried out based on the physical and chemical properties of the soil. The results showed that the DNA content of Fusarium was 3.29×109, 2.85×109, and 5.85×109 copies/g before the treatment of Dazomet, Calcium cyanamide and Metam sodium, respectively, and the DNA content of Fusarium decreased to 1.72×109, 2.17×109 and 5.25×109 copies/g at 0 d after fumigation and unmasking. The number of microorganisms in the 3 fumigant treatments was significantly reduced at 0 d after the film was uncovered, and the number of actinomycetes recovered and was higher than the initial level after 60 d after the film was uncovered in the Calcium cyanamide treatment. The control effects of Dazomet, Calcium cyanamide and Metam sodium on the root rot of lettuce were 78.90%, 62.55% and 48.64%, respectively. The yield weights of Dazomet, Calcium cyanamide and Metam sodium after treatment were 0.72, 0.70 and 0.70 kg, respectively. Compared with CK, the yield increase rate of the lettuce in Dazomet treatment was 60.00%, and the growth promotion rate was more than 16%, followed by Calcium cyanamide and Metam sodium treatment. The pH before treatment with Calcium cyanamide and Dazomet was 6.89 and 6.88, respectively, and increased to 7.12 and 6.98 after 60 d of uncovering the film. The initial soil electrical conductivity of Dazomet, Calcium cyanamide and Metam sodium were 284.50, 324.00, and 330.00 μs/cm, respectively, and decreased by 22.38%, 13.88%, and 37.18%, respectively, after 60 d of uncovering the film. Therefore, the 3 fumigant treatments can inhibit Fusarium to varying degrees, increase the agronomic characteristics and yield of lettuce, restore the number of microorganisms in the later stage, and will not significantly disturb the soil microbial community, which was safe for the environment. This research lays a technical support for the restoration and reconstruction technology of lettuce planting soil micro-ecological.
Key wordsFumigant      Fusarium spp.      Soil microbial community      Yield     
Received: 19 March 2021     
ZTFLH:  S636  
Corresponding Authors: **xiexuewen@caas.cn; libaoju@caas.cn   
About author:: * These authors contributed equally to this work
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CHEN Li-Da
SHI Yan-Xia
LI Lei
CHAI A-Li
GUO Ning
FAN Teng-Fei
XIE Xue-Wen
LI Bao-Ju
Cite this article:   
CHEN Li-Da,SHI Yan-Xia,LI Lei, et al. Efficacies of Different Soil Fumigants Against Fusarium spp. of Lettuce (Lactuca sativa) Planting Soil and Their Influences on Soil Microbial Community[J]. 农业生物技术学报, 2021, 29(12): 2365-2374.
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http://journal05.magtech.org.cn/Jwk_ny/EN/10.3969/j.issn.1674-7968.2021.12.010     OR     http://journal05.magtech.org.cn/Jwk_ny/EN/Y2021/V29/I12/2365
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