Vasilev1, S. Malchev2, A. Zhivondov2 1“Konstantin Preslavsky” University of Shumen, 115 Universitetska Str., 9700 Shumen, Bulgaria 2Fruit Growing Institute, 12 Ostromila Str., 4004 Plovdiv, Bulgaria (Manuscript received 20 June 2019; accepted for publication 15 August 20
Continue Reading →