Uçgun, K., Gezgin, S., Akgül, H., Harmankaya, M., Atasay, A., Altındal, M., İlban, B., Cansu, M., & Seymen, T. (2013). CALIBRATION OF REFERENCE VALUES USED IN EVALUATION OF LEAF ANALYSIS FOR ISPARTA REGION AT APPLE TREES. Horticultural Studies (HortiS), 30, 54-61. http://doi.org/