Influences of girdling and potassium treatments on fruit quality and some physiological characters of ‘Fremont’ mandarin variety

Abstract Growing citrus involves cultural treatments such as girdling and foliar potassium treatment to increase fruit size, yield quality. The aim of the study was evaluate effects single double stem girdling, nitrate (KNO 3 ) on leaves combinations these yield, size quality characteristics, leaf chlorophyll concentration nitrogen content, fluorescence (PSII) sugar content ‘Fremont’ mandarin variety. Girdling were applied by removing 4 mm wide ring bark at end anthesis after June drop. Foliar KNO applications a 4% twice (90 days 120 full anthesis) in experiment. (SG) (DG) stems increased (kg · tree −1 approximately 40% relative control (C). Treatments did not significantly affect internal variety except colour appearance. highest impact found DG + treatment. According periods, SPAD values varied between 62.08 70.67, whereas PSII 0.698 0.756. (N) fructose, glucose sucrose concentrations control. N detected treatment, total SG