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Acta Prataculturae Sinica ›› 2018, Vol. 27 ›› Issue (3): 57-66.DOI: 10.11686/cyxb2017163

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Simulation model of photosynthesis and dry matter accumulation in oilseed flax based on APSIM

LI Yue1, Wu Ling2, Gao Zhen-ni1, Niu Jun-yi3   

  1. 1.College of Information Science and Technology, Gansu Agricultural University, Lanzhou 730070, China;
    2.Modern Information Technology and Education Center, Lanzhou Jiaotong University, Lanzhou 730070, China;
    3.College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China;
  • Received:2017-03-31 Revised:2017-05-27 Online:2018-03-20 Published:2018-03-20

Abstract: Photosynthesis and dry matter accumulation simulation models are the core of crop growth models. Taking existing models and using radiation use efficiency, and considering the influence of environmental factors and respiration consumption on photosynthetic rate, a physiological and ecological processes model for photosynthesis and dry matter accumulation in oilseed flax was established. This model produced improved simulation and applicability during validation experiments with different sowing methods, planting density and nitrogen and phosphorus levels. For example, the root mean squared error (RMSE) value with different planting densities ranged from 0.0807 to 0.2086, with a mean of 0.1584 while the R2 ranged from 0.9677 to 0.9965, mean 0.9869. The RMSE value with different nitrogen and phosphorus levels ranged from 0.0952 to 1.2375 with a mean of 0.4000 while the R2 range from 0.8964 to 0.9959, mean 0.9700. The biomass simulations from this model were compared with the APSIM (Agricultural Production System Simulator) and AquaCrop (FAO Crop Model to Simulate Yield Response to Water) with different nitrogen and phosphorus levels. The results of this study lay the foundation for the further development of oilseed flax growth models, and provide the basis for the application of growth model and management decisions in flax.