Modeling Nitrate Movement and Dissipation in Fertilized Soils

摘要: It is important to know the fate of nitrogen (N) fertilizers ensure crop production and avoid pollution, but frequent measurement soil N difficult. Therefore, we developed a digital model calculate occurrence, movement, dissipation nitrate-nitrogen (NO₃-N) within profile fertilized agricultural lands. Daily NO₃-N amounts distributions 1.8-m were calculated by representing major processes influencing for entire year. moisture movement predicted previously moisture-evapotranspiration model. Profiles measured periodically on two research watersheds in western Iowa, one normally (168 kg/ha per year) other excessively (448 with used verification. The daily calculations cornfields (Zea mays L.) moderately permeable soils included dissipation, leaching. profiles closely represented those measured.