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In soilless systems, beneficial microbes offer control of root pathogens, as they colonize root systems and create an antagonistic environ to pathogens. Biological products, are better at preventing disease rather than curing it so early establishment of beneficial organisms is crucial. Just like any living organism, bacteria require food. Plant roots supply the simple carbon, but bacteria benefit from N, P, K, Ca, and other nutrients as well, and obtain them from organic matter and inorganic sources.
Increasing beneficial microorganisms on leaf surfaces significantly reduces foliar disease. Plants with 70% or more of the leaf surface occupied by beneficial microorganisms also have higher leaf tissue concentrations of important nutrients.
Bacillus subtilis is well known in the research world because, not only can it out compete other bacteria for space and nutrients, but it produces enzymes and antibiotics that it uses on competitors. Unlike fungal biological products that grow on plant roots, Bacillus have small tails or flagella making them able to go on seek-and-destroy missions in your nutrient solution. Endomycorrhizae fungi protect the host plant against root-infecting pathogenic bacteria. The mechanisms involved in these interactions include physical protection, chemical interactions and indirect effects. Mycorrhizal fungi can survive in a totally aqueous environment, as long as it is properly aerated. |
Pepper roots inoculated with Mycorrhizae
Mycorrhizae extensions on a root
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