Using the DSSAT model to simulate cotton growth and yield with different nitrogen levels in central Hebei Plain

• 1、Key Laboratory of Crop Growth Regulation of Hebei Province, College of agriculture, Hebei Agricultural University, Baoding, 071001

Abstract：With the development of information technology, computer models have become a powerful tool for agricultural research. In this study, using "Lu Mian Yan 28" as the material, The DSSAT model V4.7 was used to study the effect of different fertilization measures on cotton yield production The results show that, through parameter adjustment and calibration, the DSSAT model has the good simulation results on seed cotton yield, tops dry weight and leaf area index, the NMRSE is less than 20%. But the model for daily tops dry weight distribution is Inaccurate. By simulating the growth of crops, the 120kg/hm2 nitrogen level in the normal rainfall year and high soil foundation can maintain the seed cotton yield under the condition of the experiment. However, whether the nitrogen level can maintain this seed cotton yield for a long time remains to be further verified by experiments. This study provides a new technical proposal for improving the nitrogen utilization efficiency of cotton cultivation in Hebei Province, reducing the amount of fertilizer application and reducing the production cost. It helps to help relevant workers optimize cotton production management.

Keywords： Crop cultivation DSSAT model Nitrogen fertilizer application Seed cotton yield Cotton