Impact of feldspar and liquid Bio-fertilizer on fruit quantity and quality of olive trees Picual cv.Laila F. Hagagg, M.F.M. Shahin, Esraa M.M. Farahat, Eman, S. Elhady and Liudmila O. SushkovaBIO Web Conf., 82 (2024) 02012DOI: https://doi.org/10.1051/bioconf/20248202012