NGHIÊN CỨU HOÀN THIỆN QUY TRÌNH GHÉP CẢI TẠO NHÃN TẠI HUYỆN SÔNG MÃ TỈNH SƠN LA

In order to improve the situation of longan production in Song Ma district where area under longan cultivation account for nearly 50% whole province and more than 60% longan seedlings was used as planting materials that makes yield and quality of longan lower and lower. Following considerations have been made from the above mentioned study: 1. Cutting rootstock in March - July period was considered appropriate time, on that 10-15 branches should be reserved and nourished (about 20 years old rootstocks) for grafting done in 15 March to 15 May peeriod with 2-3 buds then left in one grafted branch, 2. Utilization of NPK fertilizer at 40 kg/tree dose and foliar fetilizer improved remarkably the yield and size of longan fruits with the newly -introduced techniques implemented in pilot demonstrations the yield of longan and income given to producers were considerably improved.