Study on the adaptability of cabbage seedlings to mechanized transplantation under different bacterial treatments
[Objective]Different root growth-promoting bacteria were applied to the roots of cabbage seedlings.By means of plant type regulation and root growth condition adjustment,cabbage seedlings with higher adaptability to the transplanting machine were selected,and the most effective bacterial agent was screened.[Method]With the cabbage variety"YR Zhonggan 21"as the test material,eight microbial agents with promoting effects on plant root growth were selected,including Bacillus amyloliquefaciens,Streptomyces microflavus,Paenibacillus polymyxa,Pseudomonas fluorescens,Bacillus methylotrophi-cus,Bacillus subtilis,Hugenling(a root protective agent),and B.subtilis+Trichoderma harzianum com-plex.With the non application of microbial agents as controls(CK),the plant height,stem diameter,leaf area,spread,chlorophyll content,chlorophyll fluorescence parameters,root growth indicators,root vitality,loose lump rate,and microbial quantity in the root matrix of cabbage seedlings under different treatments were compared.The type of microbial agent applied to the cabbage seedlings that shows the highest adapt-ability to mechanized transplantation was selected.Also,the control group of cabbage was further studied.From 14 to 30 days after sowing,cabbage seedlings were transplanted every two days by the transplanting machine.The transplanting rate,seedling survival rate,and loose clumping rate of different seedling ages were recorded to determine the suitable seedling parameters for mechanized transplantation.[Result]After comprehensive analysis of various investigation indicators of cabbage seedlings under different bacterial treatments,it was found that cabbage seedlings treated with Hugenling showed higher adaptability to mechanized transplantation.Compared with other bacterial agents,Hugenling has a stronger promoting effect on cabbage plant height,stem diameter,and leaf area.The seedling spread is reduced by 11.54％compared to CK,with the cabbage plant type changed and the risk of"seedling jamming"reduced.The chlorophyll content,initial fluorescence parameters(Fo),maximum fluorescence(Fm),maximum photo-chemical efficiency(Fv/Fm),and photochemical quenching coefficient(qP)of seedlings all significantly in-creased compared to CK,with the photosynthetic efficiency improved.The total number,total length,total volume,and total surface area of seedling roots increased by 126.34％,47.63％,210.53％,and 47.73％,re-spectively,compared to CK,leading to the promotion of root system's retention capacity for the substrate.The rate of loose clumps significantly decreased compared to CK,and root vitality increased by 89.78％compared to CK.The number of bacteria in the root zone matrix of seedlings significantly increased,while the number of fungi significantly decreased compared to CK,leading to a significant improvement on the nutrient utilization efficiency of seedlings.Different ages of cabbage seedlings without bacterial agents were transplanted by a transplanting machine.It can be seen that the seedling growth spread after 18-26 days of sowing is 4-10 cm,which is not limited by the transplanting machine.The seedling rate and survival rate can both exceed 80％,and the loose clump rate is below 20％.The cabbage seedlings in this develop-ment stage has good compatibility with the transplanting machine and can be used as a reference for seed-ling parameters suitable for mechanized transplantation.[Conclusion]Hugenling has a significant growth-promoting effect on the root system of cabbage seedlings,and effectively adjusts the plant type of cabbage seedlings,making it more compatible with transplanters and having the least impact on seedling transplan-tation.
万方数据
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