| dc.description.abstract | Loss of nitrogen (N) as ammonia from plant tissue may increase with higher rates of applied N fertilizer. This research project was initiated to estimate the potential N loss in winter wheat (Triticum aestivum L.). Two experiments were selected that evaluated N rate, method of application and crop residue incorporation. Wheat N accumulation was determined at various growth stages and N gain/loss was evaluated between physiological stages. Plant tissue samples were collected at Feekes 7, anthesis, post-anthesis (14 days after anthesis) and maturity (grain and straw). Dry matter yield and total N accumulated was determined at each of these stages. Field trials were conducted on a Teller sandy loam (fine-loamy, mixed, thermic Udic Argiustoll) in Perkins, OK and on a Norge loam (fine-silty, mixed, thermic Pachic ArgiustoH) in Stillwater, OK Significant differences were observed among the treatments for forage, grain and straw yield, N uptake and N loss. Estimates of N loss over the last two years at Stillwater and Perkins ranged from 0.95 to 59.21 kg. N ha�1 and 2.50 to 39.50 kg ha-1 , respectively. The results of this study indicate the gaseous plant N loss should be considered as a N loss pathway when studying the fate of applied N in the environment. | |
