tailieunhanh - Nghiên cưu khoa học nông nghiệp " Nursery quality guide for Macadamia Trees grown in Vietnam. "

Để nhằm mục đích gì khi trồng cây Macadamia. 1. Cây chỉ nên được thu được từ xã hội Macadamia hoặc cơ quan đáng tin cậy khác được công nhận vườn ươm. 2. Cây nên được growen nhằm cây chất lượng cao, khỏe mạnh. Cây không đáp ứng tiêu chuẩn sau đây nên được loại bỏ. | Nursery quality guide for Macadamia Trees grown in Vietnam. What to aim for when growing Macadamia trees. 1. Trees should only be obtained from macadamia society or other credible authority recognised nurseries. 2. Trees should be growen aiming at high quality healthy trees. Trees that do not meet the following standards should be discarded. 3. Generally neatness and hygiene of a nursery usually indicates good nursery practice. 4. The trees should not be grown on the basis of price alone but rather on the health of the trees. A healthy tree will give a good start as an unhealthy tree cannot be rectified later in the orchard. 5. Trees available for planting should be uniform in size and age. 6. The stems should be straight and trained to a central leader. 7. Leaves should be large shiny dark green and well formed with no deficiency symptoms. Trees with yellow or pale leaves be appropriately treated to rectify the problem otherwise discarded. 8. Trees should have at least two hardened off flushes at sale. 9. The bag should have a minimum capacity of 5 litres. Preferably 6-8 litres 10 .The graft should be between 20 and 40cm high 11. The graft union should be strong and must be properly healed. 12. Trees should be between 60 cm and in height at sale. 13. The roots of the nursery trees should show vigorous growth and not show signs of being affected by fungus or disease. 14. The prospective buyer should be able to randomly select 1 or 2 trees from a batch and open the bag to investigate the root development. 15. Seedlings should be grown in potting mixes that have high levels of organic matter such as composited pine bark sawdust nut husk and clean sand that allows for vigorous root development. 16. The roots should be well developed and should not be pot bound or bent. Root systems should have adventitious roots all the way around with a mass of fine root hairs. 17. Scratch the fine roots and bend them - if they are soft and light yellow beneath the bark then .