Response of Douglas-fir seedlings to nitrogen, sulfur, and phosphorus fertilizers.

M.A. Radwan; J.S. Shumway

doi:10.2737/PNW-RP-346

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Response of Douglas-fir seedlings to nitrogen, sulfur, and phosphorus fertilizers.

Informally Refereed

Authors:

M.A. Radwan, J.S. Shumway

Year:

1985

Type:

Research Paper

Station:

Pacific Northwest Research Station

DOI:

https://doi.org/10.2737/PNW-RP-346

Source:

Res. Pap. PNW-RP-346. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 20 p

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Abstract

Effects of nitrogen, sulfur, and phosphorus fertilizers on growth and nutrient content of Douglas-fir seedlings potted in Grove and Bunker forest soils were determined. Growth was primarily stimulated with nitrogen in the Grove soil and with phosphorus in the Bunker soil. Fertilization influenced nutrient levels in the seedlings. Growth results agree with observed response of Douglas-fir to fertilization in the field where the soils were collected. Data also suggest that low phosphorus and/or high nitrogen may be responsible for lack of positive growth response of Douglas-fir to nitrogen fertilizer on some sites.

Keywords

fertilizer response, nutrient elements (plant), plant-soil relations, seedling growth, Douglas-fir

Citation

Radwan, M.A.; Shumway, J.S. 1985. Response of Douglas-fir seedlings to nitrogen, sulfur, and phosphorus fertilizers. Res. Pap. PNW-RP-346. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 20 p