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- [4] AN EVALUATION OF FERTILIZER AND SOIL-NITROGEN UPTAKE BY WHEAT JOURNAL OF AGRONOMY AND CROP SCIENCE-ZEITSCHRIFT FUR ACKER UND PFLANZENBAU, 1987, 158 (03): : 187 - 189
- [5] Use of labeled nitrogen to monitor transition in nitrogen dependence from storage to current-year uptake in mature walnut trees TREES-STRUCTURE AND FUNCTION, 1989, 3 (01): : 11 - 16