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The R esponse of Sitka Spruce to Sulphate of Ammonia 23TABLE 6Effect of Treatment on Foliar P Concentrations, 1967-1969Mean Foliar P Concentration (% DM)TreatmentPoPIP2P 3MeanNo NI N219670.07 0.09 0.080.17 0.13 0.180.26 0.17 0.150.20 0.20 0.140.17 0.14 0.14CV = 0.88 %19690.13 0.13 0.160.24 0.28 0.330.30 0.29 0.310.32 0.35 0.380.25 0.26 0.29CV= 0.93%Mean No NI N2 Mean19680.08 0.11 0.08 0.10 0.090.16 0.17 0.23 0.24 0.210.19 0.23 0.21 0.18 0.210.18 0.26 0.21 0.22 0.230.19 0.18 0.18CV= 1.02 %Significant Comparisons0.14 No vs (NI+N2) '67**0.28 PovS(P 1 + P2+ P 3 ) '67**'68**'69**0.30 (PI + P2) vs P 30.35 PI VS P 2'69**'67*Significance level : *0.05, **0.01 .CY: Coefficient of variation.TABLE 7Effect of Treatment on Foliar P. Content, 1967TreatmentMean Foliar P Content (mg/lOO needles)NoPo 0.20PI 0.46P2 0.70P 3 0.61Mean 0.49CV= 5.15%NI N2 Mean0.33 0.27 0.270.48 0.64 0.530.76 0.55 0.670.71 0.67 0.660.57 0.53Significant Comparisons:Po vs (PI+ P2+P 3 )**Significance level : *0.05, **0.01.CY:Coefficient of variation.