. Seven-year response of 35-year-old Douglas-fir to nitrogen fertilizer. Trees Growth; Forest soils Fertilization; Nitrogen fertilizers. Table in live trees per acre and average Treatment 1/ Live trees 1963 1970 Average , 1963 Increase in average growth of surviving trees!./ -tiumber- 0 600 507 140 573 507 280 627 433 420 620 393 1/ 2/ Pounds of nitrogen per acre. Average of live trees in 1970 minus average of live trees in 1963; weighted average of three plots per treatment. 3/ —
. Seven-year response of 35-year-old Douglas-fir to nitrogen fertilizer. Trees Growth; Forest soils Fertilization; Nitrogen fertilizers. Table in live trees per acre and average Treatment 1/ Live trees 1963 1970 Average , 1963 Increase in average growth of surviving trees!./ -tiumber- 0 600 507 140 573 507 280 627 433 420 620 393 1/ 2/ Pounds of nitrogen per acre. Average of live trees in 1970 minus average of live trees in 1963; weighted average of three plots per treatment. 3/ — Average growth of trees surviving in 1970, weighted average of three plots per treatment. _. 140 280 NITROGEN APPLIED (POUNDS PER ACRE) 420 Figure ,h. growth after fertilizing. (Weighted average of three plots per treatment.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Miller, Richard E. cn; Pienaar, Leon V. (Leon Visser), 1936-; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ). Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture, Forest Service
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