Surikova, V. and Kārkiņš, A. 2015. COMPETITION BETWEEN APPLE-TREES AND GRASS IN THE ORCHARD. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference. 1, (Aug. 2015), 169–175. DOI:https://doi.org/10.17770/etr2009vol1.1118.