Effect of Pre-harvest spray of Calcium nitrate, Boric acid and Zinc sulphate on yield, quality and storability of Nagpur mandarin (Citrus reticulata Blanco)

Abstract
A field experiment entitled "Effect of Pre-harvest spray of calcium nitrate, boric acid and zinc sulphate on yield ,quality and storability of Nagpur mandarin (Citrus reticulata Blanco)" was conducted at the Fruit Research Farm, Department of Fruit science, College of Horticulture and Forestry, Jhalawar during September 2014 to March, 2015. The experiment was consisting of 28 treatments having three levels of each Calcium nitrate (1, 2 and 3 per cent), Boric acid (0.2, 0.4 and 0.6 per cent) and Zinc sulphate (0.2, 0.4 and 0.6 per cent) and one overall control. The experiment was laid out in Factorial randomized block design with three replications. Among different doses of Pre-harvest spray of Micronutrients, calcium nitrate @ 3 per cent, boric acid @ 0.6 per cent and zinc sulphate @ 0.6 per cent were found significantly superior over control with respect physical characteristics, chemical or quality parameters, yield attributes and storability of Nagpur mandarin. In case of interaction effect of Pre-harvest spray of micronutrients, the application of T27 treatment (calcium nitrate @ 3.0 per cent, + boric acid @ 0.6 per cent + zinc sulphate @ 0.6 per cent) was found best with regards to maximum increase in fruit weight, fruit volume, diameter of fruit (horizontal and vertical), reduced peel thickness, number of fruit per plant, non reducing sugar, total sugar, juice per cent, sensory score, fruit yield per plant, estimated yield tonnes/ha over control. This treatment combination has also given minimum physiological loss in weight, decay per cent and higher retention of juice percent and sensory score till end of storage period as compared to other treatments. Further, T24 treatment combination (calcium nitrate @ 3.0 % + boric acid @ 0.4 % + Zinc sulphate @ 0.6 %) has also given maximum increased number of segments per fruit, TSS, TSS: Acid ratio, ascorbic acid content, and reduced number of seeds per fruit and acidity percent of fruits Similarly, T27 treatment (calcium nitrate @ 3.0 per cent, + boric acid @ 0.6 per cent + zinc sulphate @ 0.6 per cent) has resulted the maximum gross return of Rs. 1,26,400/ha which was Rs. 55,400/ha excess over control. Further, the highest net profit (Rs. 48,560/ha) was also estimated at this treatment which was 78.03 per cent higher than control.
Description
Effect of Pre-harvest spray of Calcium nitrate, Boric acid and Zinc sulphate on yield, quality and storability of Nagpur mandarin (Citrus reticulata Blanco)
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