Clonal Forestry
Gmelina arborea
This species can be propagated by hardwood cuttings, semi hardwood cuttings or young bud sprouts. Spring season is the best season for rooting of cuttings.
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a) Hardwood Cuttings

The cuttings are collected lower and out portion of the canopy from healthy vigorous branches measuring 1-2 cm in diameter. The leaves and terminal soft portions are excised and treated with 5000 ppm IBA for by basal dip method. Rooting occurs in about 12 weeks, with 55 per cent (Chandra and Gandhi, 1995).

b) Softwood Cuttings

The branches representing the epicormic or coppice shoots are collected. Their upper soft wood portions are cut and made into 4 – 7 cm long bimodal leafy cuttings. The leaves are then trimmed to 1/3 of its size and treated with 5000 ppm IBA containing 0.1% bavistin or any other suitable fungicide. These cuttings are placed in 80% relative humidity and around 25 - 30ºC temperature. The rooting takes place within 4 – 6 weeks. The hardwood rooted cuttings can be planted in the field directly.

c) Bud Sprouts

Young bud sprouts, about 2-4 cm length with half open first pair of leaves are removed from the shoots during morning hours. The sprouts are treated with 2000 ppm IBA mixed with the fungicide planted in vermiculite or coarse sand based medium and placed in mist chamber. These sprouts will strike roots within 20-30 days (Gurdev Singh et al., 1992). They are hardened before out planting. The per cent success is almost 100% when bud sprouts are used for propagation.
Branch cuttings are collected from the lower one third of the crown. The length of the cuttings is approximately 20cm with thickness of 12 to 15 mm. Since rooting medium require proper drainage, sand, soil and silt in the ratio of 2:1:1 is used. Fungicide treatment is given as soil drench with bavistin 0.2 percent before planting. The base of the cutting is dipped in IBA 200 ppm. It is found to be effective and showed fifty percent rooting of cuttings. The rooted cuttings are transferred to hardening chamber and kept for 15-25 days. After hardening the cuttings are ready for field planting.

 

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