| Modeling of dry matter distribution and organ growth of flax using APSIM and validation |
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| DOI：10.7606/j.issn.1000-7601.2018.06.17 |
| Key Words: flax dry matter distribution organ growth APSIM simulation model |
| Author Name | Affiliation | | LI Yue | College of Information Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WU Ling | Network and Information Center, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China | | GAO Zhen-Ni | College of Information Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | NIU Jun-Yi | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to accurately predict yield of flax seed, we simulated the dry matter distribution and organ growth by using experiments data of various sowing methods (with residual film, with new film, and seeding after removing the residual film), planting density (3×106（D1）、4.5×106（D2）、6×106（D3）、7.5×106（D4）、9×106（D5）、1.05×107（D6）、1.2×107（D7）plant·hm-2) and nitrogen and phosphorus levels in Dingxi and Yuzhong in 2012-2013 based on APSIM. The distribution proportion of matter of each organ was determined using key cultivar parameters such as leaf biomass, pod biomass, growth rate of harvest index, the maximum harvest index, oil content of seeds, oil content of carbohydrate, and moisture content of seeds. The model was validated using observed value in 2014-2015. The results showed that the average RMSE and R2 value of total dry matter above ground were 1.7652 g per plant and 0.8649, respectively, the average RMSE and R2 value with different sowing methods were 1.8928 and 0.8453, respectively. They were 1.5344 g per plant and 0.9135 for different density, and 1.9371 g per plant and 0.8267 for nitrogen and phosphorus levels, respectively. The RMSE values of stem, leaf and pod were 1.7751, 2.6371, 1.9785 g per plant and the R2 value were 0.9344, 0.8077, and 0.9118, respectively. The validation showed that the model can properly mimic the dynamic change of total dry weight of flax plant and dry weight of organs above ground. |
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