شبيه سازي عملكرد دانه و جذب نيتروژن در برنج تحت مديريت آبياري و نيتروژن

Simulating rice grain yield and nitrogen uptake under irrigation and nitrogen managment

ﭘﮋوﻫﺶ ﺣﺎﺿـﺮ ﺑﻪﻣﻨﻈﻮر ارزﯾﺎﺑﯽ اﯾﻦ ﻣﺪل، ﺑﻪﺻـﻮرت ﮐﺮتﻫﺎي ﺧﺮدﺷـﺪه در ﻗﺎﻟﺐ ﺑﻠﻮك ﮐﺎﻣﻞ ﺗﺼـﺎدﻓﯽ ﺑﺮ روي رﻗﻢ ﻫﺎﺷـﻤﯽ ﺑﺎ ﺳـﻪ ﺗﮑﺮار در دو ﺳـﺎل زراﻋﯽ اﻧﺠﺎم ﺷـﺪ. ﻋﺎﻣﻞ اﺻـﻠﯽ آزﻣﺎﯾﺶ ﺷـﺎﻣﻞ آﺑﯿﺎري در 2 ﺳـﻄﺢ )ﻏﺮﻗﺎب، آﺑﯿﺎري ﻧﻮﺑﺘﯽ10 روز( و ﻋﺎﻣﻞ ﻓﺮﻋﯽ ﻧﯿﺘﺮوژن در 3 ﺳـﻄﺢ )ﺷـﺎﻫﺪ، 50 و 100 ﮐﯿﻠﻮﮔﺮم در ﻫﮑﺘﺎر( ﺑﻮد. ارزﯾﺎﺑﯽ ﻣﻘﺎدﯾﺮ ﺷـﺒﯿﻪﺳﺎزي و اﻧﺪازهﮔﯿﺮي ﺷﺪه ﻋﻤﻠﮑﺮد داﻧﻪ، ﺑﯿﻮﻟﻮژﯾﮏ، ﻧﯿﺘﺮوژن داﻧﻪ و ﮐﻞ ﺑﺎ اﺳـﺘﻔﺎده از ﭘﺎراﻣﺘﺮﻫﺎي ﺿـﺮﯾﺐ ﺗﺒﯿﯿﻦ ، آزﻣﻮنRMSE ،t و RMSEnاﻧﺠﺎم ﮔﺮﻓﺖ. ﻧﺘﺎﯾﺞ ﻧﺸـﺎن داد ﻣﻘﺪار رﯾﺸـﻪ ﻣﯿﺎﻧﮕﯿﻦ ﻣﺮﺑﻌﺎت ﺧﻄﺎي ﻧﺮﻣﺎل ﺷـﺪه ﺑﯿﻦ 8 ﺗﺎ 13 درﺻـﺪ، ﺷـﺒﯿﻪﺳـﺎزي ﻣﻘﺎدﯾﺮ ﻣﺎده ﺧﺸـﮏ و ﻧﯿﺘﺮوژن ﺟﺬبﺷـﺪه در ﺷـﺮاﯾﻂ آﺑﯿﺎري و ﮐﻮد ﻧﯿﺘﺮوژن ﻣﺘﻐﯿﺮ اﺳـﺖ. ﻋﻤﻠﮑﺮد ﺑﺎ رﯾﺸــﻪ ﻣﯿﺎﻧﮕﯿﻦ ﻣﺮﺑﻌﺎت ﺧﻄﺎي 254 ﺗﺎ 261 ﮐﯿﻠﻮﮔﺮم در ﻫﮑﺘﺎر و رﯾﺸــﻪ ﻣﯿﺎﻧﮕﯿﻦ ﻣﺮﺑﻌﺎت ﺧﻄﺎي ﻧﺮﻣﺎل ﺷــﺪه 8ﺗﺎ 9 درﺻــﺪ ﺷـﺒﯿﻪﺳـﺎزي ﺷـﺪ. ﻣﻘﺎدﯾﺮ ﺿـﺮﯾﺐ ﺗﺒﯿﯿﻦ ﺑﺮاي ﻋﻤﻠﮑﺮد داﻧﻪ، ﻋﻤﻠﮑﺮد ﺑﯿﻮﻟﻮژﯾﮏ، ﻧﯿﺘﺮوژن داﻧﻪ و ﻧﯿﺘﺮوژن ﮐﻞ ﺑﻪ ﺗﺮﺗﯿﺐ ﺑﺮاﺑﺮ ﺑﺎ 0/91 ،0/85، 0/79 و 0/84ﺑﻮد. ﻣﺪل ﻣﻘﺪار ﻧﯿﺘﺮوژن داﻧﻪ و ﮐﻞ را ﺑﯿﺸـﺘﺮ از ﻣﻘﺪار اﻧﺪازهﮔﯿﺮي، ﺷـﺒﯿﻪﺳـﺎزي ﻧﻤﻮد. ﻧﺘﺎﯾﺞ ﺗﺤﻘﯿﻖ ﻧﺸـﺎن داد ﮐﻪ ﻣﯽﺗﻮان ﻣﺪل ORYZA2000 ﺑﺮاي ﭘﺸﺘﯿﺒﺎﻧﯽ ﻧﺘﺎﯾﺞ ﭘﮋوﻫﺶﻫﺎي ﺗﺤﺖ ﺷﺮاﯾﻂ ﻣﺤﺪودﯾﺖ آﺑﯿﺎري و ﻧﯿﺘﺮوژن اﺳﺘﻔﺎده ﮐﺮد.

To evaluated ORYZA2000 model, an split-Plot in RCBD experiment with three replication in 2018 and 2019 crop years. The main factor was rice irrigation at two level (flooded and 8 days interval) and sub-factors include Nitrogen at three levels (0, 40 and 80 Kg/ha). Simulated and measured values grain yield, biomass yield, grain nitrogen and total nitrogen were evaluated by adjusted coefficient of correlation; t-test of means; and absolute and normalized root mean square errors (RMSE). Results show that, with normalized root mean square errors (RMSEn) of 6–16%, ORYZA2000 satisfactorily simulated crop biomass and N uptake that strongly varied between irrigation and nitrogen fertilizer. Yield was simulated with an RMSE of 188–277 kg ha-1 and a normalized RMSE of 5–7%. Coefficient values for grain yield, biological yield, grain nitrogen and total nitrogen, respectively, 0.89, 0.89, 0.92 and 0.83. Simulated grain nitrogen and total nitrogen generally exceeded measured at low rates of nitrogen application. Results show that, ORYZA2000 could be used successfully to support N and irrigation management under the limited conditions.