Thinning experiment Norway spruce 337, Pfalzgrafenweiler. Silvicultural results and conclusions [German]

摘要

Subject of the paper is the analysis of a fertilization trial, located in a 110 year old Norway spruce stand in the northern part of the Black Forest in Southwest Germany. 42 years after fertilization, the periodic volume increment of plot no5 fertilized with N, Ca, and P turned out to be superior by 18 %, compared to the control plot. Plot 2 (N-fertilization and liming) was superior by 17%, plot 4 (pure N-fertilization) by 10%, plot 1 (liming followed by a later N-fertilization) by 7%. Plot 6, fertilized with P and Ca only, showed a not significant superiority in volume increment of only 4 % (fig. 5).