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Comparison of Fall and Spring Application of 15N-Labeled Urea to Douglas-Fir: I. Growth Response and Nitrogen Levels in Foliage and Soil1

✍ Scribed by Heilman, P. E.; Dao, Thanh; Cheng, H. H.; Webster, S. R.; Harper, S. S.

No coin nor oath required. For personal study only.

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