Baloda, SatpalDhakad, Ashok2019-12-112019-12-112019http://krishikosh.egranth.ac.in/handle/1/5810137334The investigation entitled “Effect of NAA and zinc sulphate on fruit drop, yield and quality of mulberry (Morus alba L.)” was conducted at Orchard of Department of Horticulture, CCS Haryana Agricultural University, Hisar during the year 2018-19. Thirty two uniform trees of local cultivars of mulberry and foliar application of different concentrations of micronutrient (zinc sulphate @ 0.2, 0.4 and 0.6%) and growth regulator (NAA @ 20, 40 and 60 ppm) in the first and last week of March. Significantly improvement in flowering and fruiting parameters i.e. number of catkins per shoot, fruit set and fruit retention per cent was recorded from the trees treated with zinc sulphate @ 0.4 per cent and NAA @ 60 ppm, while fruit drop was obtained minimum with zinc sulphate @ 0.4 per cent and NAA @ 60 ppm. Maximum increase in yield parameters i.e. fruit length, fruit breadth, fruit weight and total yield per tree was observed in the fruits harvested from the trees treated with zinc sulphate (0.4% and 0.6%) and NAA @ 60 ppm. Significantly improvement in quality parameters i.e. TSS, TSS/acid ratio, ascorbic acid, reducing and total sugar was observed in the fruits harvested from the trees treated with zinc sulphate @ 0.4 per cent and NAA @ 40 ppm except non-reducing sugar, while acidity was minimum with zinc sulphate @ 0.4 per cent and NAA @ 40 ppm. Significant improvement in the leaves and fruit nutrient (N, P, K and Zn) concentrations was obtained with the foliar sprays of zinc sulphate and NAA. Maximum N, P and K content was found with the foliar spray of zinc sulphate @ 0.4 per cent and NAA @ 60 ppm, while maximum zinc content was found with the foliar spray of zinc sulphate @ 0.6 per cent and NAA @ 60 ppm.ennullThesis