Simulating rice grain yield and nitrogen uptake under irrigation and nitrogen managment
الموضوعات :
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الکلمات المفتاحية: Rice, برنج, میانگین مربعات خطا, Interval Irrigation, RMSE, RMSEn, آبیاری نوبتی, میانگین مربعات خطای نرمال شده,
ملخص المقالة :
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.
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