Theme 09: Forage Quality
Description
The effect of nitrogen (N) fertilization and plant stage on nitrate accumulation was studied in a sorghum-Sudan grass hybrid. Grass cv. Dynagrazer was sown at the experimental site of Texas A & M University. Six N levels were applied (0, 112 … 672 Kg. N ha-1). Nitrate concentrations were determined in three harvests, 5– 7 weeks after planting. Maximum levels were 2.1, 3.5 and 4.6 g nitrate-N kg-1 DM, respectively, which is beyond the safe limits for animal consumption. The plots were cut at heading. Regrowth took place on residual N. Nitrate-N accumulation was lowest in the leaves and increased from the top to the bottom of the stem. In forage regrown from plots initially fertilized with 336 kg N ha-1 or more, the nitrate levels in the bottom and central part of the stem exceeded the safety limit for feeding.
Citation
Elgersma, A.; Tecle, I. Y.; and Provin, T., "Nitrate Accumulation in a Sorghum-Sudangrass Hybrid as Influenced by Nitrogen Fertilization" (2021). IGC Proceedings (1993-2023). 15.
https://uknowledge.uky.edu/igc/19/9/15
Included in
Nitrate Accumulation in a Sorghum-Sudangrass Hybrid as Influenced by Nitrogen Fertilization
The effect of nitrogen (N) fertilization and plant stage on nitrate accumulation was studied in a sorghum-Sudan grass hybrid. Grass cv. Dynagrazer was sown at the experimental site of Texas A & M University. Six N levels were applied (0, 112 … 672 Kg. N ha-1). Nitrate concentrations were determined in three harvests, 5– 7 weeks after planting. Maximum levels were 2.1, 3.5 and 4.6 g nitrate-N kg-1 DM, respectively, which is beyond the safe limits for animal consumption. The plots were cut at heading. Regrowth took place on residual N. Nitrate-N accumulation was lowest in the leaves and increased from the top to the bottom of the stem. In forage regrown from plots initially fertilized with 336 kg N ha-1 or more, the nitrate levels in the bottom and central part of the stem exceeded the safety limit for feeding.
