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Title: Response of Douglas-fir seedlings to nitrogen, sulfur, and phosphorus fertilizers.
Author: Radwan, M.A.; Shumway, J.S.;
Source: Res. Pap. PNW-RP-346. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 20 p
Publication Series: Research Paper (RP)
Description: 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
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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
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