Shy bearing tendency is one of the serious problem in the commercial production of sweet lime. The shy bearing tendency of sweet lime is mainly due to the production of small number of perfect flowers. Potassium is known to play critical role in perfect flowers formation and other fruit attributes. Therefore the current study was conducted during 2019  to study the potential role of potassium sources (Control, Potassium chloride (KCl), Potassium sulfate (K₂SO₄), Potassium nitrate (KNO₃) its time of application  (15^th Feb, 25^th Feb, 7^th March and 17^th March) and tree canopy orientations (North, South, West and East) in regulations of sex expression and yield attributes of sweet lime. Results indicated that potassium nitrate significantly increased perfect flowers (27.34 %), fruit set (69.14 %) and decreased staminate flowers. Potassium chloride application resulted in least fruit drop (37.44 %). In case of time of application, 17^th March application resulted in increased perfect flowers (26.74 %), least staminate flowers (72.60 %) and reduced fruit drop (36.75). Results regarding tree canopy orientations indicated that best results were recorded from Northern direction of the canopy in term of maximum perfect flowers (25.30 %), fruit set (67.91 %) and least staminate flowers (74.40 %). Least fruit drop (36.90) was noted from Southern direction. It is concluded that potassium nitrate as a source of potassium may be sprayed on 17^th March for more desirable results of sweet lime.

Keywords: Potassium sources, Time of application, Tree canopy orientations, sex expression, yield attributes