Growth and stem form changes in Picea abies as affected by stand nutrition
1988
Mead, D.J. (Canterbury Univ., Christchurch (New Zealand). School of Forestry) | Tamm, C.O.
The changes in basal area, volume and tree shape in an 'optimum fertility trial' in Norway spruce were studied after the treatments had been applied for 15 years. There was a marked response to N and a lesser response to P. Increased average tree taper was associated with the N application. Form factors tended to show less change, but, even allowing for tree height responses, there was up to a 10% reduction. Phosphate fertilizer in the presence of N increased form factor slightly; applying a 'complete' fertilizer reduced form factor and increased taper while the trees were under about 6 m tall. The use of individual treatment regressions of volume on basal area resulted in increased precision in estimating the volume of individual treatment means.
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