The use of effective microorganisms as plant growth promoters and biotic resistance inducers
Abstract: Studies on using trade product “EM” on strawberry plantations and various methods of their application were conducted in 2011-2012. The experimental area was established at an organic farm with cv. Honeoye. The tests were arranged in a randomized plot design, and each plot was repeated four times. Foliar spraying treatments with EM and dipping of the roots in EM solution were performed. Observations of plant development were carried out, including the fresh weight of above ground plants parts and numbers of runners. Additionally, elicitation of plant defence and chlorophyll content were studied. The highest mass of fresh plants cut from treated pots was noted for 5% EM, applied in 6 treatments with 14 day intervals. The increase to 10% EM did not influence plant growth parameters. A similar trend was observed in the number of runners. Regardless of the frequency of treatments after repeated treatment with EM (foliar spraying and treating the roots of plants before planting) at the end of the growing season, ß-glycosidase activity decreased and the content of phenols increased in strawberry leaf cells. This suggests an activation of the plant defence system. However, in 2012, despite EM concentration and treatments frequency, elicitation of plant defense response was not observed. There was no effect of EM treatments on chlorophyll a + b content.