What does the published scientific research say about Trichoderma harzianum?

Eight PubMed articles index Trichoderma harzianum (Rifai, 1969) in a plant-input context, covering biofertilizer trials, rhizosphere soil health, seed germination, and mechanistic studies of plant growth promotion. Research spans multiple crop systems and regions, from Saudi Arabia soil isolates to commercial-scale trials on medicinal herbs.

Peer-reviewed research reports that T. harzianum biofertilizer promoted growth, yield, and quality in Bupleurum chinense, and separately increased plant height, fresh weight, and dry weight of Lagenaria siceraria by 21.4%, 24.5%, and 4.5%, respectively, while reducing rhizosphere abundance of harmful fungi including Fusarium and Podosphaera. A mechanism study identified peptaibols — specifically trichorzin PA II and VI produced by T. harzianum — as activators of plant plasma membrane H⁺-ATPase, cited as a candidate explanation for the fungus's observed growth-promoting effects.

Additional literature covers T. harzianum metabolite-derived selenium and titanium dioxide nanoparticles with antifungal activity against Fusarium culmorum at 100 mg/L, and bioformulation compatibility with sophorolipid biosurfactants that improved rice seed germination morphology by up to 30%. What the research says about Trichoderma harzianum as an agricultural input reflects individual study findings across these use cases; this literature record does not establish regulatory registration status on its own.