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- [9] THE EFFECT OF ADDITIONAL NITROGEN-FERTILIZATION ON THE NUTRITIVE-VALUE OF GRAIN-SORGHUM OKLAHOMA AGRICULTURAL EXPERIMENT STATION MISCELLANEOUS PUBLICATION, 1981, (108): : 158 - 161
- [10] EFFECT OF NITROGEN-FERTILIZATION ON FORAGE SORGHUM YIELD DIRECTLY DRILLED IN UNTILLED SOD CUBAN JOURNAL OF AGRICULTURAL SCIENCE, 1976, 10 (01): : 99 - 106