Pacific Southwest

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

Author: Powers, Robert F.; Jackson, Grant D.

Date: 1978

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

Station ID: RP-PSW-132

Description: 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

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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.