Download Full PDF - 41.38 MB - The Society of Irish Foresters

More documents

Recommendations

Info

IRISH FORESTRY Results Shoot elongation and flushing Early wrenching significantly reduced the height growth that occurred over the period between the first and the second wrenching (p :O::O.05). However, wrenching treatments did not significantly influence height growth after each of the two subsequent wrenchings. Although mid or late season wrenching had no significant effect on height growth, treatment effects were apparent for mid season wrenching due to the effect of undercutting in June. For this reason, only the effect of early (July) and mid (August) season wrenching (and combinations of these treatments) on height growth is shown (Figure 1). The effect of wrenching treatments on end-of-season plant height is described in detail below (based upon a separate sample of plants). The seasonal pattern of height growth was similar regardless of wrenching treatment (Figure 1). Height growth was slow in June and early July, and then increased rapidly during late July and early August. Height growth was most rapid from late August until mid to late September. Thereafter, height growth was slow and ceased in about early October. The control seedlings (no fertiliser) were the tallest at the end of the growing season. Root wrenching in the 1999 growing season had no significant effect on the date of lateral bud flushing in the following spring (mean, 8 March). Morphology Final plant height was significantly reduced by mid or late season wrenching (Table 3). In addition, the number of wrenchings received (regardless of application date) significantly affected plant height. Mean height ranged from 39-46 cm for wrenched seedlings, smaller than the 49 cm for both controls (Figure 2). Compared with the standard treatment (control minus fertiliser), a single wrenching reduced height increment by about 7%, while more than one wrenching reduced it by about 15%. Table 3. Significance of effect of fertiliser and wrenching treatments on morphological characteristics and root growth potential in Japanese larch transplants. Abbreviations: Root collar diameter (ReD); shoot (SDW) and root (RDW) dry weights; root growth potential (RGP), not significant (ns). Source of variation Height ReD Sturdiness SDW RDW SDW/ RDW Fertiliser ns ns ns ns ns ns ns Early season wrenching (E) ns ns 0.0043 ns ns 0.0004 ns Mid-season (M) wrenching 0.0029 ns 0.0036 ns 0.0248 0.0013 0.0417 Late season (L) wrenching 0.0062 ns ns ns ns 0.0129 ns ExM ns ns ns ns ns ns ns ExL ns ns 0.0279 ns ns ns ns MxL ns ns ns ns ns ns ns ExMxL ns ns ns ns ns ns ns Number of wrenchings 0.0029 ns
IRISH FORESTRY 60 Seedling height E .s. 50 1: 40 OJ ·m I 30 20 8 C+F C-F E M EM EL ML EML Root collar diameter E 7 E. L.. 2 (!) E C\l (5 6 C+F C-F E M EM EL ML EML 10 Sturdiness 9 C+F C-F E M EM EL ML EML Wrenching treatment Figure 2. Mean total height, root collar diameter and sturdiness of Japanese larch seedlings lined-out in autumn or spring and then subjected to combinations of early (E), mid (M), and late (L) season wrenching or no wrenching (control, C). All seedlings except one set of controls (C-F) received additional fertiliser. Means significantly (p
Page 2 and 3: -----------------------------------
Page 4 and 5: -----------------------------------
Page 6 and 7: --------------------., Are You BARK
Page 8: GROWING QUALITY forests of the futu
Page 11 and 12: EDITORIAL Seeing the wood and the t
Page 13 and 14: IRISH FORESTRY Most bare-root plant
Page 15 and 16: IRISH FORESTRY Phenology of shoot g
Page 17: IRISH FORESTRY Data analyses All da
Page 21 and 22: IRISH FORESTRY The date of wrenchin
Page 23 and 24: IRISH FORESTRY Root collar diameter
Page 25 and 26: IRISH FORESTRY addition, root growt
Page 27 and 28: IRISH FORESTRY Rook, D.A. 1971. Eff
Page 29 and 30: IRISH FORESTRY 3. maintain rural em
Page 31 and 32: IRISH FORESTRY enhance the organic
Page 33 and 34: IRISH FORESTRY Figure 1. Normal can
Page 35 and 36: IRISH FORESTRY In Britain in simila
Page 37 and 38: IRISH FORESTRY 3. natural regenerat
Page 39 and 40: IRISH FORESTRY McAdam, lH. and Hopp
Page 41 and 42: IRISH FORESTRY regeneration is the
Page 43 and 44: IRISH FORESTRY Table 2. continued V
Page 45 and 46: IRISH FORESTRY Table 5. continued V
Page 47 and 48: IRISH FORESTRY all are influenced b
Page 49 and 50: IRISH FORESTRY Carey, M.L. and Hend
Page 51 and 52: IRISH FORESTRY Ireland were in need
Page 53 and 54: IRISH FORESTRY Figure 1. Tree locat
Page 55 and 56: IRISH FORESTRY The specimens contin
Page 57 and 58: IRISH FORESTRY TROBI recorded just
Page 59 and 60: IRISH FORESTRY Mechanical propertie
Page 61 and 62: IRISH FORESTRY Table 1. Materials i
Page 63 and 64: IRISH FORESTRY Table 2. Modulus of
Page 65 and 66: IRISH FORESTRY and therefore small
Page 67 and 68: IRISH FORESTRY Conclusions Mechanic
Page 69 and 70:
Trees, Woods and Literature - 26 Ji
Page 71 and 72:
IRISH FORESTRY seconds. Eventually
Page 73 and 74:
Book reviews Sitka spruce in Irelan
Page 75 and 76:
IRISH FORESTRY is sketchy and is di
Page 77 and 78:
IRISH FORESTRY ics manager. The nur
Page 79 and 80:
IRISH FORESTRY 1 indigenous species
Page 81 and 82:
IRISH FORESTRY The arrival of these
Page 83 and 84:
IRISH FORESTRY • elimination of u
Page 85 and 86:
IRISH FORESTRY Tsitsikamma two furt
Page 87 and 88:
IRISH FORESTRY light lunch, most of
Page 89 and 90:
IRISH FORESTRY than 15 cm in diamet
Page 91 and 92:
IRISH FORESTRY Fynbos ueretarion me
Page 93 and 94:
IRISH FORESTRY After a guided tour
Page 95 and 96:
IRISH FORESTRY Mairtin 6 Neachtain
Page 97 and 98:
ecco YOU HAVEN'T TRIED? -IT'S TIME
Page 99 and 100:
Many (J{ Northern Ireland's ji:Jres
Page 103 and 104:
Treeshelters and Spirals Discover T
show all

Download Full PDF - 41.38 MB - The Society of Irish Foresters

Create successful ePaper yourself

Delete template?

Save as template?