Adaptability and nut yield of Macadamia clones in North West Vietnam
Keywords:
Clone,, Macadamia, nut yieldAbstract
Objectives of the study were to better understand adaptability, growth and nut yield of Macadamia and clonal variation in these traits, information that will support sustainable development of this species in the Northwest region. The study evaluated seven Macadamia plantations in the Northwest region. Macadamia shows good adaptability and reasonable nut yields in several different locations 300 - 700 metres above sea level. A clone trial at Mai Son, Son La province, tested six selected clones and two controls (unimproved seedlings, and cuttings from selected superior seedling trees). Significant differences in annual nut yield were recorded in two successive years over the
period 2011 - 12. Clones OC, 246 and 816had the highest yields of the six clones tested, with mean ranging from 2 to 6kg per tree. Nut yields were higher in 2011 than in 2012. Clones 246 and OC maintained the highest consistent nut yields during these two years. Clone 842had high nut yield in 2011 but its yield significantly decreased in 2012. Clone 816had intermediate nut yield and remained stable over the 2 years. We suggest that clones OC, 246 and 816 should be planted in mixture to maintain sustainable yield as well as ensuring maximum cross - pollination. Recommendations on suitable climatic conditions
for planting Macadamia are presented, and management issues in Macadamia plantations with respect to the Northwest conditions are also discussed.
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