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- [6] COMPARISON OF UREA AND AMMONIUM-NITRATE AS NITROGEN-SOURCES FOR POTATOES AMERICAN POTATO JOURNAL, 1987, 64 (04): : 165 - 176
- [10] AMMONIUM-NITRATE, UREA AND UREA-AMMONIUM NITRATE SOLUTION AS NITROGEN-SOURCES FOR WINTER-WHEAT JOURNAL OF FERTILIZER ISSUES, 1986, 3 (01): : 25 - 29