Effects of Trichoderma Bio-organic Fertilizer on the Growth and Disease Resistance of Coriander

Purpose To compare the effects of different Trichoderma-type bio-organic fertilizers on the growth promotion and disease resistance of coriander.

Methods Using non-continuous cropping soil and continuous cropping soil severely affected by soil-borne diseases as pot experiment objects, four treatments were set up respectively: chemical fertilizer (CK), ordinary organic fertilizer (OF), T. harzianum bio-organic fertilizer (HB), and T. viride bio-organic fertilizer (VB). By investigating the effects of different fertilization treatments on coriander growth, soil electrical conductivity (EC), cation exchange capacity (CEC), soil enzyme activities, and plant antioxidant enzyme activities in non-continuous cropping soil, as well as plant antioxidant enzyme activities, disease incidence, and disease index in continuous cropping soil, the optimal Trichoderma-type bio-organic fertilizer with the best effects of growth promotion and disease resistance was screened.

Results Compared with CK and OF treatment, VB treatment could effectively promote the growth of coriander, reduce soil EC, increase soil CEC, soil enzyme and plant antioxidant enzyme activities, and reduce the incidence rate and disease index of coriander. In non-continuous cropping soil, compared with other treatments, VB treatment significantly increased root vitality, soil CEC, soil acid phosphatase, superoxide dismutase, and catalase activities by 24.03%-248.56%, 5.66%-52.49%, 11.89%-21.58%, 17.20%-73.22%, 12.68%-25.72%, respectively; and significantly decreased soil EC by 1.38%-15.68%. Redundancy analysis showed that superoxide dismutase was a key factor regulating the growth-promoting effect of coriander, and VB treatment significantly optimized its growth indicators. In continuous cropping soil, the incidence rate and disease index of VB treatment significantly decreased by 19.23%-78.85% and 21.19%-111.92%, respectively; and the peroxidase activity significantly increased by 4.92%-133.55%.

Conclusion  T. viride bio-organic fertilizer has significant effects on promoting the growth and disease prevention of coriander, and synergistic enhancement of superoxide dismutase activity can significantly optimize the growth indicators of coriander. Therefore, T. viride bio-organic fertilizer can be selected for coriander cultivation.