Download Full PDF - 28.09 MB - The Society of Irish Foresters
Download Full PDF - 28.09 MB - The Society of Irish Foresters Download Full PDF - 28.09 MB - The Society of Irish Foresters
The R esponse of Sitka Spruce to Sulphate of Ammonia 19At Glenamoy, both G.N.A.P. and Sf A produced significant growthresponses in the season of application. This appears to run contraryto the theory of growth predetermination, viz. , growth in the currentseason is largely determined at the time of bud setting in the previousTABLE 2Incidence of Broken Leading Shoots (transformed) in the 1969 SeasonTreatment No NI N2 MeanDegrees %1 Degrees %1 Degrees %1 Degrees %1Po 10.1 3.0 21.7 13.6 18.8 10.4 16.8 8.4PI 36.3 35.0 45.0 50.1 39.8 41.0 40.4 42.0P 2 35.4 33.6 43.6 47.5 40.2 41.7 39.7 40.9P 3 36.3 35.0 40.4 42.1 35.1 33.1 37.3 36.7Mean 29.5 24.3 37.7 37.4 33.5 32.1CV= 125.53 %Analysis of Variance (Degrees)SourceNPNPBErrordf236333Mean Square266.901] ,513.94918.389324.49842.119F6.337**35.945**7.704**1. % back transformed.B: Blocks.Significance level : *0.05, **0.01.TABLE 3Analysis of Variance for the Regression of Broken Leading Shoots on TotalHeight, 1969SourcedfMean SquaresFDue to RegressionDeviation about RegressionTotal146472,846.20459 27.83**102.26503Significance level : *0.05, **0.01 .
20 Irish Forestryseason and is therefore controlled by conditions in that season. Manyworkers have not taken measurements until the second season aftertreatment. Others have failed to observe any significant growthresponses in the first season (Dickson, 1969; Brix and Ebell, 1969).The occurrence of a response is apparently linked to the time offertilizer application. The work of Paarlathi (1967) in Finland and ofO'Carroll (1972) indicate that fertilizers applied before March shouldcertainly produce an effect in the current season.Wind damage was serious during the 1969 growing season. Alarge number of leading shoots was broken (Table 2). The maximumwind speed recorded during the period was 42 knots (in August)whereas a wind of 86 knots, in January 1968, caused little visibledamage to the stand. The effect of both fertilizers on leader breakagewas highly significant. This was due to the direct effect of thefertilizers on leader growth. The regression of leader breakage ontotal height was highly significant in the 1969 season (Table 3). Theeffect of blocks on leader breakage (Table 2) and on total height(data not presented) were both highly significant in this season.Mean tree height in each block with corresponding mean incidenceof leader breakage (degrees) were as follows:Mean Height (m)Leader Breakage (degrees)3.2938.082.8026.472.8632.933.0736.74If there is a real relationship between total height and incidence ofinjury, it may be expected that Sitka spruce crops, having reached acritical height, which would vary with location, would lose a part oftheir annual leader growth at wind speeds which are by no meansrare in the western part of the country. This raises a question concerningthe continued use of this species on exposed western sites.However, the considerable variation in growth rates over the area,due to the experimental treatments, may have created an artificialsituation. The forest lacked the uniformity which is important for itsstability and protection.Effect of fertilizers on foliar nutrient concentrationsHeight increment was excellent with foliar N concentrations as lowas 1.08 % D.M. (Tables I and 4). Previous reports gave concentrationsbetween 1.2 and 2.0 % as optimum or adequate for "normal"tree growth (Ley ton, 1958a; Tamm 1964; Dickson, 1965; Baule andFricker, 1970). Maximum or near maximum responses can beobtained on this site at relatively low concentrations of foliar N.Other work at Glenamoy tends to confirm this (O'Hare, 1967a).Growth may be seriously limited below a concentration of 1.0 %.
- Page 1 and 2: IRISH FORESTRYJournal of the Societ
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- Page 10 and 11: IRISH FORESTRY:CONTENTS(A uthors al
- Page 12 and 13: IRISH FORESTRYVolume 29 1972 No.2Ed
- Page 14 and 15: Some Forestry Problems in the Europ
- Page 16 and 17: Some Forestry Problems in the Europ
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- Page 24 and 25: The Response of Sitka Spruce to Sul
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- Page 36 and 37: The Response 0 fSitka Spruce to Sul
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- Page 64 and 65: M eetings 55papers were presented,
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- Page 68 and 69: Notes and News 59material. Laborato
- Page 70 and 71: Obituary 61opened on 29th May 1968
- Page 72 and 73: Reviews 63includes an Appendix VI b
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- Page 76 and 77: COUNCIL REPORT FOR 1971Following th
<strong>The</strong> R esponse <strong>of</strong> Sitka Spruce to Sulphate <strong>of</strong> Ammonia 19At Glenamoy, both G.N.A.P. and Sf A produced significant growthresponses in the season <strong>of</strong> application. This appears to run contraryto the theory <strong>of</strong> growth predetermination, viz. , growth in the currentseason is largely determined at the time <strong>of</strong> bud setting in the previousTABLE 2Incidence <strong>of</strong> Broken Leading Shoots (transformed) in the 1969 SeasonTreatment No NI N2 MeanDegrees %1 Degrees %1 Degrees %1 Degrees %1Po 10.1 3.0 21.7 13.6 18.8 10.4 16.8 8.4PI 36.3 35.0 45.0 50.1 39.8 41.0 40.4 42.0P 2 35.4 33.6 43.6 47.5 40.2 41.7 39.7 40.9P 3 36.3 35.0 40.4 42.1 35.1 33.1 37.3 36.7Mean 29.5 24.3 37.7 37.4 33.5 32.1CV= 125.53 %Analysis <strong>of</strong> Variance (Degrees)SourceNPNPBErrordf236333Mean Square266.901] ,513.94918.389324.49842.119F6.337**35.945**7.704**1. % back transformed.B: Blocks.Significance level : *0.05, **0.01.TABLE 3Analysis <strong>of</strong> Variance for the Regression <strong>of</strong> Broken Leading Shoots on TotalHeight, 1969SourcedfMean SquaresFDue to RegressionDeviation about RegressionTotal146472,846.20459 27.83**102.26503Significance level : *0.05, **0.01 .