MỘT SỐ KẾT QUẢ NGHIÊN CỨU HOÀN THIỆN QUY TRÌNH NHÂN GIỐNG VÀ TRỒNG MỚI HAI GIỐNG CAO SU VNg 77-2 VÀ VNg 77-4 CHO CÁC TỈNH MIỀN NÚI PHÍA BẮC
MỘT SỐ KẾT QUẢ NGHIÊN CỨU HOÀN THIỆN QUY TRÌNH NHÂN GIỐNG VÀ TRỒNG MỚI HAI GIỐNG CAO SU VNg 77-2 VÀ VNg 77-4 CHO CÁC TỈNH MIỀN NÚI PHÍA BẮC
Some research results on perfecting multiplication process and new plantation two rubber varieties namely VNg 77-2 and VNg 77-4 in the Northern mountainous provinces.
Some research results of the project: “Trial production of 2 cold tolerant rubber varieties VNg77-2 and VNg77-4” have been contributing foundation of science for perfecting multiplication process and planting of two new rubber varieties in the Northern mountainous provinces: In the rubber nursery of canopied polybags, the survival rate is over 85% of grafted plants from June to September. In the second year of rubber fields (basic construction stage), the chemical fertilizer utilization of 51 kgN + 65kgP2O5 + 28kg K2O/ha has helped the plant to reach 17.1% of the rise of perimeter compared to the control experiment, which applied by 51 kgN + 50kgP2O5 + 18kg K2O/ha. Moreover, the fertilizer application in March- April and in July- August lead to a significant increase of rubber perimeter and ranged from 14.2 to 18.5% compared to the fertilizer application in April and October.