This trial (Xu, Wang, & Mridha, 2008) published in the Journal of Crop Production, looks at Effects of Fertilisers and a Microbial Inoculant on Leaf Photosynthesis and Fruit Yield and Quality of Tomato Plants. The trial showed that EM Inoculation increased plant growth and fruit yield in all treatments. In this study, available phosphorus concentration. 50 days after transplanting were higher in EM treated soils than untreated soils. This might be associated with the activities of the EM microbes. However, 90 days after planting, the nitrogen and available phosphorus concetrations were lower in EM-treated soils. This might be associated with more absorbtion of the nutrients by the plants that showed faster growth and higher fruit yield in EM-treated plots than untreated plots. Other areas to note from this study showed EM increased photosynthetic activity in the plants and vitamin C concentration in tomato fruit.

An Effective Plant Strengthening Agent for Tomatoes in Protected Cultivation

In this trial (Ndona, Friedel, Spornberger, Rinnofner, & Jezik, 2011) conducted by the University of Natural Resources and Life Sciences Vienna, Austria, looked at the effect of EM on tomato yeild and also the effect on fruit quality and disease. The results showed that the total yield was higher and the number of fruits damaged by blossom-end rot was reduced in the EM-treated plants. The percentage of fruits in the best quality class, was also significantly higher.

Application of EM on Nutrient Contents In Leaves And Yielding of Tomato

The aim of this study (Kleiber, et al., 2014) was to evaluate the effect of applying Effective Microorganisms (EM), at a varied CRF (controlled release fertilisers) fertilization as starter fertilization, on macro element contents in leaves and yielding of tomato grown in a peat substrate. Application of EM had a significant effect – when applied either as seed inoculation or combined seed inoculation + spraying of plants, on increase of total and commercial yields of tomato (35.8% and 40%; 44.6% and 35.9%, respectively).


Xu, H.-L., Wang, R., & Mridha, M. A. (2008). Effects of Organic Fertilizers and Microbial Inoculant on Leaf Photosunthesis and Fruit Yield and Quality of Tomato Plants. Journal of Crop Protection.

Kleiber, T., Starzyk, J., Gorski, R., Sobieralski, K., Siwulski, M., Rempulska, A., et al. (2014). The Studies on Applying of EM and CRF on Nutrient Contents in Leaves and Yielding of Tomato. Acta Scientiarum Polonorum Hortorum Cultus.