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Nagpur Mandarin (Citrus reticulata Blanco.) which occupies the first position among the citrus in India with respect to area and production. It is considered one of the most important loose skinned oranges being commercially grown in Nagpur region of Maharashtra, Mandsaur district of Madhya Pradesh and Jhalawar District of Rajasthan State. In India, citrus fruits occupies a prominent place and extensively grown as tropical and subtropical fruits after mango and banana. The Fruit of Nagpur Santra are subglobose, with average weight 110-125g, rind medium thick, fairly loosely adherent, surface is relatively smooth, segment 10-15 number and seeds 1-2 per segment, peel colour pale orange fruits quality good. The total production of mandarin in India is 34.31 lakh tonnes from an area of 330.0 thousand hectares with the productivity of 10.4 MT/ha. In Rajasthan mandarin covers 11.20 thousand hectares area producing 229.90 thousand MT with the productivity of 20.5 MT/ha.1 The mineral nutrients play an important role in the development and growth of new cells in plant metabolism. The Calcium salts are known to be involved in a number of physiological processes concerning membrane structure, function and enzymatic activity. The calcium, like that of all minerals, is still obscure, but it is important for cell division and cell wall development.2 Zinc (Zn) is an essential micro element for plants, being involved in many enzymatic reactions and is necessary for their good growth and development. Zinc improves the auxins content and it also acts as catalyst in oxidation-reduction processes.3 Boron is also a heavy metal micronutrient. It is absorbed by plant in the form of boric acid (H3BO3). It is essential for translocation of sugar; involved in reproduction of plants and germination of pollen grains.4 Since the demand of fruit is increasing in the market, thereby to achieve higher yield of good quality fruit become the priority. The application of mineral nutrients like calcium nitrate, boric acid and zinc sulphate are known to play a crucial role in growth, development of fruits. The present study will contribute to ascertain the physical and biochemical status of Nagpur mandarin fruits at harvest as influenced by preharvest spray of mineral nutrients, which may help in increasing the yield Nagpur mandarin. Hence, the present studies were undertaken under Rajasthan conditions especially in Jhalawar with the followings objectives: To study the effect of pre harvest spray of calcium nitrate, boric acid and zinc sulphate on yield attributing characters and to work out economic feasibility of Nagpur mandarin.

horticulture international journal

Effect and Economic Feasibility of Preharvest Spray of Calcium Nitrate, Boric Acid and Zinc Sulphate on Yield Attributing Characters of Nagpur Mandarin (Citrus Reticulata Blanco)