Ponderosa pine response to fertilization: influence of brush removal and soil type

Robert F. Powers; Grant D. Jackson

Treesearch

Ponderosa pine response to fertilization: influence of brush removal and soil type

Informally Refereed

Authors:

Robert F. Powers, Grant D. Jackson

Year:

1978

Type:

Research Paper

Station:

Pacific Southwest Research Station

Source:

Res. Paper PSW-RP-132. Berkeley, CA: US Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 9 p

Download (PDF 1.37 MB)

Download (PDF 1.37 MB): https://research.fs.usda.gov/download/treesearch/30601.pdf

Abstract

First-year results of fertilization in a young ponderosa pine plantation on two contrasting soils were analyzed. Trees testing low in foliar nitrogen responded strongly to fertilization where brush had been removed, but failed to respond if brush remained. Height growth was doubled by certain treatment combinations on the less fertile Mariposa soil, but was not influenced by treatment on the more fertile Cohasset. Brush removal increased needle weight or trees on both soils. Increases in foliar biomass and nitrogen content of trees on treated plots suggest that rapid growth rates will continue.

Keywords

Pinus ponderosa, fertilization, weeding, soil fertility, Mariposa soil, Cohasset soil, manzanita

Citation

Powers, Robert F.; Jackson, Grant D. 1978. Ponderosa pine response to fertilization: influence of brush removal and soil type. Res. Paper PSW-RP-132. Berkeley, CA: US Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 9 p