Abstract
Peach rootstock in Thailand has relied on only local clones introduced from Southern China. Local roostocks have expressed some degree of incompatibility with peach scions at older ages. Presently, new improved low chilling rootstocks being used elsewhere could adapt to Thailand's climate. The objective was to evaluate the influence of local rootstocks: 'Khunwang', 'White Angkhang' and 'Red Angkhang' and imported rootstocks: 'Coastal Peach', 'Flordaguard', 'In Je Taur', 'Kuu Taur', 'Okinawa' and 'Premier' on growth of 'TropicBeauty', TX2293-3 and TXW1491-1 as scions. Trees were planted at the Angkhang Royal Agricultural Station (19°50'-19°57'N ; 99°01'-99°06'E; 1,200 m a.s.l.) in 2002. Growth evaluation, scion height, number of flower and leaf buds, pruned branch weight, trunk cross sectional area, mineral concentration (N, P, K) and yield were measured along with chemical properties of soil (pH and mineral concentration) when trees were three and four years old. Significant differences were observed in scion height, branch weight, trunk size, number of flower buds and yield. Scion height was the greatest on 'Coastal Peach' (2.22 m.); while, branch weight, trunk size, number of flower buds and yield were the highest on 'Okinawa' (1.45 kg, 59.56 cm 2 , 17 buds and 7.99 kg, respectively). There was no incompatibility observed among rootstock and scion cultivars in early ages. In summary, 'Okinawa' had the highest growth and good scion performance as compared to other rootstocks.
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