EFFECT OF ROOTSTOCK AGE AND SCION SOURCE ON GRAFTING Malus doumeri, AN APPLE TREE
NINH VIET KHUONG
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
TRAN VAN DO *
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
NGUYEN QUANG HUNG
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
NGUYEN TOAN THANG
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
TRIEU THAI HUNG
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
DUONG DINH DUC
Lai Chau Department of Science and Technology, Lai Chau City, Lai Chau, Vietnam.
TRAN THI KIM HUONG
Lai Chau Department of Science and Technology, Lai Chau City, Lai Chau, Vietnam.
PHAM QUANG TUYEN
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
PHUNG DINH TRUNG
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam and Tam Duong Protection Forest Board, Tam Duong, Lai Chau, Vietnam.
TRAN HOANG QUY
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
TRAN HAI LONG
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
NGUYEN VAN TUAN
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
TRAN CAO NGUYEN
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
DANG THI HAI HA
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
PHAM DINH SAM
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam .
VU TIEN LAM
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
HO TRUNG LUONG
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
PHAM TIEN DUNG
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam and Tam Duong Protection Forest Board, Tam Duong, Lai Chau, Vietnam.
DUONG QUANG TRUNG
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
NGUYEN DINH THUONG
Tam Duong Protection Forest Board, Tam Duong, Lai Chau, Vietnam.
PHAM DANH TUYEN
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam.
VU DUC TOAN
Tay Bac University, Son La City, Son La, Vietnam.
*Author to whom correspondence should be addressed.
Abstract
Grafting Malus doumeri, an apple tree, is becoming important as plantation areas are increasing in recent years. The effects of rootstock ages and scion sources on success rate, shoot number, and growth of M. doumeri were conducted in North Vietnam by using the sub-side grafting technique. The results indicated that at both three and five months of growth, the ages of rootstock significantly affected shoot number and shoot length. While at five months of growth success rate of grafting was higher in using rootstock of 2-years old. The ratio was 88.9% in 2-year-old rootstocks and that was 65.1% in the 1-year-old rootstock. At five months of growth, shoot number was 1.6, and shoot length was 55.2 cm in using 2-year-old rootstocks. Scion sources did not significantly affect the success rate at both three and five months of growth. Meanwhile, they did significantly affect shoot number and shoot length. The shoot number reduced between three and five months of growth due to competitions for light and nutrients, and ice rain. It is concluded that to graft M. doumeri trees, rootstocks of 2-years old should be used by sub-side technique. While looking for suitability between rootstock and scion source/cultivars should be taken care of for higher success rate and better growth of shoots on the scion.
Keywords: Environment, fertilization, rootstock age, scion source, shading