Effects of sprout cutting in the alternate rows of thinned stands on growth and yield of Eucalyptus camaldulensis Dehnh. coppices
1996
Suntiruk Salle
Yield of Eucalyptus camaldulensis Dehnh. coppices in the alternate rows of thinned stands was investigated at Somdet Plantation, Amphoe Muang, Changwat Kalasin since August 1993. The 10 - year old E. camaldulensis trees which were initially grown in 2*2, 2*4 and 2*8 m spacing were thinned in alternate rows. Six months later, sprout cutting have been done in each spacing. The remaining sprouts were 2, 3, 4, 5 sprouts and all sprouts in the control. The height (H) and D0 of the remained and cut sprouts were measured twice. The biomass in each part of the remained sprouts were estimated by using allometric relation. After thinning, the results revealed that the highest total biomass of 1-year old sprout was 39.86 Kg/clump, in the 4*8 m spacing and the lowest was 10.49 Kg/clump, in 2*4 m spacing. The largest total biomass in 4*4 m spacing with 3 remaining sprouts was 14.33 ton/hectare and lowest in 4*8 m spacing with 4 remaining sprouts was 6.43 ton/hectare. It is concluded that the spacing and the number of the remaining sprouts which gave the highest total biomass per area was the 4*4 m with 3 remaining sprouts. The statistical test shown that the spacing had no significant effect on the absolute and relative growth rates, but the number of the remaining sprout made the relative growth rate of every part of the sprout to be significantly different. Growth rate of each part of sprout was not significantly different both from the results of spacing and the remaining of various number of sprouts.
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