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Nitrogen and phosphorus fertilizers were applied to the soil surface in a 2-0 ponderosa pine plantation on the Payette National Forest in west-central Idaho. The study area was located in an Abies grandis/Acer glabrum habitat type on a basalt soil. The fertilizer treatments did not increase survival or growth of the trees, nor did they increase the amount of competing vegetation. The only significant response was a reduction in survival caused by the high level nitrogen treatments.

Effects of nitrogen and phosphorus fertilizer on planted ponderosa pine in west-central Idaho /