Influence of scion length and point of attachment on rootstock on survival and growth of grafted soursop

Soursop (Annona muricata) is a multipurpose fruit tree species, which is mostly propagated by seeds, thus producing plants that exhibit various degree of variability. The objective of this study was to assess the influence of scion length and point of attachment on rootstock on survival and growth on grafted Annona muricata. Varying points were marked out on the rootstock from the base of the plant and varying scion lengths (5, 10 and 15 cm) were collected. The modified cleft method of grafting was adopted and this was monitored daily for freshness and appearance of new shoot. At the end of two months, survived grafted plants were removed and arranged under a weaning shed, where they were further monitored for number of leaves, height of graft, diameter of scion and rootstock. Results showed that scion length varied significantly (P<0.05) for all the parameters assessed. The effect of point of attachment on rootstock was also significant on the number of leaves, as well as scion collar diameter. The effect rootstock on graft height and rootstock collar diameter was not significant. The interactive effect of scion and rootstock was significant (P<0.05) for all parameters, except height of graft. For successful graft, survival and growth of grafted A. muricata, 10 - 15 cm long scion should be used and this should be inserted at the upper part (15 cm) of the rootstock.