A group from Pest Integrated Management Key Laboratory of China Tobacco, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, China, etc. has reported about effects of application of microbial organic fertilizers after dazomet fumigation.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9891460/
Crop succession leads to continuous accumulation of pathogens in soil; for example, eggplant crop succession leads to severe occurrence of bacterial wilt and blight, watermelon crop succession leads to severe occurrence of wilt, and ginger crop succession can lead to severe ginger plague. This not only breaks the soil nutrient balance but also deteriorates the soil biological traits, which eventually results in the collapse of the soil microcosm and causes serious harm to crop yield and environmental safety. The using of biocontrol agent or organic fertilizer after fumigation can eliminate the negative effects of fumigants by promoting soil microcosm recovery and improving soil texture, which has become a hot research topic in this field.
This study reported about the effects of Junweinong and Junlisu microbial organic fertilizers (MOFs) applied after dazomet fumigation. these two MOFs after dazomet fumigation significantly reduced the rhizosphere soil available phosphorus, available potassium, and organic matter content, which means that plants could absorb these nutrients. Fumigation and post-fumigation application of organic fertilizer can increase soil pH. Soil pH is a key factor affecting soil health, and black shank and black root rot of tobacco have high incidence at pH 4.8–5.8. Rhizoctonia and sclerotinia diseases of cruciferous plants are prone to occur in acidic soils and hardly occur at pH 7.2–7.4 after changing soil acidity
The addition of both MOFs after fumigation increased the abundance of rhizosphere bacteria without significant effect on microbial diversity. However, it changed the composition of rhizosphere microorganisms, as bacteria such as Gaiella, norank_f_Vicinamibacteraceae, and Flavisolibacter and fungi such as Peroneutypa, Olpidium, and Microascus were significantly enriched. These microorganisms have important roles in enhancing crop system resistance and promoting nutrient uptake. In addition, the addition of MOF after dazomet fumigation increased the relative abundance of functional genes for 13 kinds of amino acid metabolism, pyruvate metabolism, TCA cycle, and pentose phosphate pathway in the rhizosphere soil.