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The R esponse of Sitka Spruce to Sulphate of Ammonia 17TABLE 1Effect of Treatment on Height Increment, 1967-1970TreatmentMean Height Increment (m)No NI N2 Mean No Nl N2 Mean1967 1968Po .14 .37 .38 .22 .28 .37 .38 .34PI .23 .56 .53 .31 .55 .56 .53 .55P2 .22 .51 .48 .34 .55 .51 .48 .51P 3 .24 .47 .47 .34 .53 .47 .47 .49Mean .21 .35 .36 .48 .48 .47CV= 4.97 % CV%4.91 %1969 1970Po .14 .24 .29 .22 .15 .49 .43 .37PI .23 .39 .33 .31 .58 .58 .67 .61P 2 .22 .37 .42 .34 .73 .67 .82 .73P3 .24 .41 .40 .34 .73 .61 .70 .68Mean .21 .35 .36 .55 .58 .64CV= 6.34% CV = 9.19%Effect of Treatment on Cumulative Height Increment, 1967-1970TreatmentMean Height Increment (m)No NI N2 MeanPo .80 1.36 1.44 1.20PI 1.87 2.02 2.02 1.97P2 2.01 1.99 2.25 2.08P 3 1.99 1.97 2.07 2.01Mean 1.67 1.83 1.95Significant Treatment Comparisons and Interactions:No vs (NI+N2) '67** '67-'70**Po vs (PI+P2+P 3 ) '67** '68** '69** '70** '67-'70**PI vs P2'70*N x P'70*Nl treatment was repeated in April 1969.Significance level : *0.05, **0.01.CY: Coefficient of variation.
18 Irish Forestryin Ca determination. Fresh peat samples were extracted with H 2 S0 4for determination of available nutrients (O'Hare, 1967b). LB.M.SSP Main Programmes, ANOV A and REGRE, were used foranalysis of variance and regression analyses. The arcsine transformationwas used on percentage broken shoots (I969) beforeanalysis. Sums of squares for Nand P were each divided into mutuallyorthogonal comparisons.RESULTS AND DISCUSSIONEffect of fertilizers on growthIn the period under discussion, 1967-'70, the phosphatic fertilizerhad a highly significant positive effect on leader growth (Table 1),confirming the need for a second phosphate application for Sitkaspruce on oligotrophic peat (Jack, 1965; O'Hare, 1967a). However,the initial phosphate application at Glenamoy, a spot application of85 g/plant G.N.A.P. may have been considerably less effective thanheavier dressings broadcast at planting time on similar sites today.No additional response was observed above the lowest level ofG.N.A.P. application (55 kg P/ha).In comparison with phosphate, the effects of applied S/A onheight increment were small. Cumulative height growth was significantlyincreased by S/A, though annual leader growth showed asignificant response only in 1967. The repeated Nl treatment, madeprior to the 1969 season, had no effect on height increment in thatseason nor in 1970. The most effective nitrogen treatment, therefore,was a single application of 625 kg/ha S/ A (132 kg N /ha). A significantN X P interaction was observed in the 1970 growing season. S/ A wasconsiderably less effective in the presence of G.N.A.P. than in itsabsence.Following the secondary application of sulphate of ammonia,severe necrosis was observed in three of the four treated plots whichhad not received phosphate in 1967. The damage was observed inearly July. In one plot, close to 50 % of the trees were affected.Typically, necrosis was evident on the upper part of the tree, theleading shoot wilted and bent and patches of dead needles were seenelsewhere on the tree. Damage was not apparently related to theage of the needles. Similar observations of damage or mortalityas a result of application of sulphate of ammonia have been reportedby Benzian (1965, 1966) on nursery trees and by Zehetmayer (1954)and O'Carroll (1972) under forest conditions. Urea applied at therate of 71 g/plant (approximately 32 g N) resulted in the deaths ofup to 48 % of the total number of trees in an experiment on peat inNorthern Ireland (Brown et ai., 1968).
Page 1 and 2: IRISH FORESTRYJournal of the Societ
Page 3: Control weedsin forestryplantations
Page 6 and 7: 'CL;EiCG DU'CCAN,~S [S 'OCI ,ATES L
Page 8 and 9: McCULLOCHWorlds best-selling CHAIN
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 24 and 25: The Response of Sitka Spruce to Sul
Page 28 and 29: The R esponse of Sitka Spruce to Su
Page 36 and 37: The Response 0 fSitka Spruce to Sul
Page 38 and 39: Labour Cost Trends in ForestNurseri
Page 40 and 41: Labour Cost Trends in Forest Nurser
Page 42 and 43: SOJ?e Patterns in Crop Structureand
Page 44 and 45: Crop Structure and Productivity for
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Page 48 and 49: LE 3Crop Structure and Productivity
Page 62 and 63: Trees Woods and Literature- · 7A w
Page 64 and 65: M eetings 55papers were presented,
Page 66 and 67: Notes and News 57strips, scattered
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
Page 74 and 75: Reviews 65where the fine lines of d
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COUNCIL REPORT FOR 1971Following th
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