ISHS Acta Horticulturae 705: V International Walnut Symposium
EFFECT OF TIME OF GRAFTING ON WALNUT GRAFT SUCCESS UNDER DIFFERENT ALTITUDES |
| Authors: | G. Tshering, T. Gyyeltsen, T. Lhendup, U. Tshering |
| Keywords: | grafting, altitudes, effects |
| Abstract:
Bhutan is a mountainous country and has diverse agro-climatic conditions. Walnut grafting failure has eluded afford of Ministry of Agriculture for walnut industry development. This led to an experiment to investigate the effects of time of grafting under ambient condition of four different altitude ranges on walnut graft survival. A randomized block design was used, with four blocks and 24 treatment combinations. Grafting was performed in mid Dec. 2001, Jan., Feb., March, April and May 2002. In total, 360 grafts were made with 15 grafts for each treatment combination, comprising three replications of 5 grafts. Modified whip grafting was used for all the treatments. The scion portion of grafts were waxed and grown under ambient conditions of different altitude ranges and arranged in a randomized block design. The success of the grafts in all experiments were assessed three months after grafting, by then, the failed grafts had shriveled and scions desiccated, and had become necrotic. The successful grafts showed considerable shoot growth. Two-analysis of variance (after angular transformation of data) for graft survival percentage showed highly significant (P < 0.001) difference among the different time of grafting under different altitude ranges. March grafting resulted significantly higher graft success over the others time of grafting across the altitudes ranges. There were no significant difference (P = 0.05) between different altitude ranges on overall graft success (inclusive of six time of grafting). | |
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