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An experiment was conducted with a view to find out the best grafting height and scion length and the reciprocal influence of the rootstock and scion on grafted citrus cultivar Nagpur mandarin at Horticultural Research Farm, Andro, College of Agriculture, Central Agricultural University, Imphal during 2014 and 2015. The plant material consisted of Nagpur Mandarin as scion and Rough Lemon seedlings as rootstock. The scion with three lengths (5 cm, 10 cm and 15 cm) were tried at three different heights (10 cm, 15 cm and 20 cm) from the ground level, comprising 9 treatment combinations (3x3). The two-factor experiment consisting of 9 treatment combinations was laid out in Factorial Randomized Block Design (FRBD) with three replications. Minimum time required for healing of the graft union (24.28) was found non-significant while the growth characteristics such as leaf area, internodal length, root length and diameter, fresh and dry weight of shoots and roots were significantly affected by grafting height and scion length interaction at the end of the observation i.e., 360 days after grafting. The treatment combination S 3 G 2 (15 x 15 cm) was found to produce maximum values while the treatment combination S 1 G 1 (5 x 10 cm) was found to produce minimum values.

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