Bons, Harsimrat KKulwinder Singh2022-01-122022-01-122021Bons, Harsimrat k (2021). Effect of foliar application of nutrients on yield and quality attributes of ber cv. Umran (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.https://krishikosh.egranth.ac.in/handle/1/5810180665The present investigation on “Effect of foliar application of nutrients on yield and quality attributes of ber cv. Umran” was carried out at Fruit Research Farm, Punjab Agricultural University, Ludhiana during year 2019-2020. Fifteen year’s old uniformly grown ber plants of cultivar Umran planted at 7.5 × 7.5 m spacing were sprayed with plant nutrients like Calcium nitrate @ 0.25 and 0.50 %, Potassium sulphate @ 0.25 and 0.50 %, Boric acid @ 0.40 and 0.60 % and Liquid sulphur @ 0.25 and 0.50 % along with control (water spray) in the month of mid-November, mid-December and mid-January. Field data regarding fruit set, fruit retention, fruit drop, powdery mildew incidence was recorded. Ber fruits were also analysed for physical and bio- chemical parameters after harvesting. Among all the foliar applications, potassium sulphate @ 0.50 % resulted in maximum fruit set (8.44 %), fruit retention (34.48 %) with minimum fruit drop (65.52%). Maximum fruit size i.e. fruit length (4.86 cm) and fruit diameter (3.06 cm), fruit weight (20.24 gm), pulp content (93.96 %), yield (68.02 kg/tree), fruit volume (19.61 cm3) and fruit colour (59.50,-4.0 and 33.46) was also recorded in potassium sulphate applied @ 0.50 % .Maximum TSS (15.63 0B), TSS/acid ratio (120.23) ascorbic acid content (110.25 mg/100g), total sugars (12.70 %), reducing sugars (5.75 %) and non reducing sugars (6.60 %) and minimum titrable acidity (0.130 %) was recorded with boric acid @ 0.60 % which was statistically at par with potassium sulphate @ 0.50 %. Further it was also observed that, foliar P, K, S, Zn, B, Fe content increased and foliar N, Ca, Mg, Mn, Cu content showed decreasing trend with application of potassium sulphate @ 0.50 %. However, minimum incidence of powdery mildew was observed in liquid sulphur (0.50 %) followed by potassium sulphate (0.50 %). From the present studies, it is concluded that three foliar applications of potassium sulphate @ 0.50 % during mid-November, midDecember and mid-January resulted in higher fruit set, fruit retention, improvement in yield and quality attributes along with reduction in fruit drop and incidence of powdery mildew in ber cv. Umran.EnglishThesis