Studies on the Nitarte Acumulation in Forages

사료작물의 질산태질소 축적에 관한 연구

Aspects of nitrate accumulation of forages growing on grasslands in Chonbuk Province, and the effects of different rates of N fertilizer on the total nitrogen and nitrate contents of sudangrass-hybrid and corn were studied through the 1991 growing season. The results obtained are summarized as follows: I . Thc nitrate content of the forages was increased by N application and decreased as the plants matured. 2. Nitrate concentration was high throughout the growing season in samples collected at Namweon-gun 1, which was considered as potentially unsafe. 3. Total nitrogen and nitrate content of plants generally increased with the increasing rates of N fertilizer, but not statistically significant among treatments except the plot of 25 kg N/lOa. 4. The annual crops had a greater tendency to accumulate nitrate than the perennial forage species. 5. It is suggested that high level of N fertilizer and manure may result in toxic levels of nitrate, and special attention must be given in feeding them.