Effects of thinning and fertilizer on Cunninghamia lanceolata (Lamb.) Hook plantation growth in Quang Ninh province
Keywords:
Cunninghamia lanceolata Lamb, Hook, thinning,, fertilizer,, Quang Ninh provinceAbstract
Research results of thinning in Cunninghamia lanceolata plantation in Quang Ninh
province after thinning 42 months showed that the density treatments of 7 year old
Cunninghamia lanceolata plantation the growing difference in volum was high to
low in m2 (1,100 trees/ha), m3 (1,600 trees/ha) and m1 (no thinning 3,322 trees/ha)
treatments, respectively 45.5 m
3
ha
1
, 43.1 m
3
ha-1
and 37.4 m
3
ha
1
. The growing
difference in volum among the density treatments was 8.1 m
3
ha
1
; In the fertilizer
treatments the volume was recorded the same trend that was from high to low,
respectively 61.9 m
3
ha
1
(p2 treatment 55g ure + 700g P2O5 + 50g K
2O), 56.5 m
3
ha
1
(p1 no treatment), 53.5 m
3
ha
1
(p3 treatment 55g ure + 700g P2O5 + 50g K
2O) and
51.5 m
3
ha
1
(p4 treament 400g MF1), and the difference in volume of growth
among the fertilizer treatments was up to 5.4 m
3
ha-1
.
For the 11 year old Cunninghamia lanceolata plantation, after 42 months thinning
in the density treatments, the volume of growth was high to low in m3, m2 and m1
treatments, respectively 59.9 m
3
ha
1
, 50.6 m
3
ha
1
and 46.8 m
3
ha
1
. The growing
difference in volum among the density treatments was highest, at 13.1 m
3
ha
1
. In the
fertilizer treatments, the volume was experienced from high to low, respectively
62.0 m
3
ha
1
(p3 treatment), 59.9 m
3
ha
1
(p2 treatment), 58.4 m
3
ha
1
(p1 no
treatment) and 58.3 m
3
ha
1
(p4 treament), the difference in volume of growth
among the fertilizer treatments was recorded at 3.7 m
3
ha
1
.
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