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首页> 外文期刊>Australian Journal of Crop Science >Assessment of yield gap due to nitrogen management in wheat
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Assessment of yield gap due to nitrogen management in wheat

机译：小麦氮素管理造成的产量缺口评估

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To assess effect of N fertilizer on yield gap (the difference between maximum attainable yield and actual yield) on wheat farms, a long-term simulation was performed using the CropSyst model and a farm survey study in 2007 - 2008 in Gorgan, Iran. Therefore, the yield simulation was performed after the different N fertilizer treatments (0 to 300 kg ha-1) under conventional agronomic practices conditions in studied area. The rate of optimum N fertilizer and maximum attainable yield were estimated using a two- segmented regression model as 171 kg N ha-1 and 5.6 t ha-1, respectively. The yield gaps between maximum attainable yield and other simulated attainable yields ranged from 0.5 to 3.6 t ha-1. It seems that yield gaps were a consequence of the deficiency of N fertilizer. The higher the yield gap, the lower the applied N fertilizer. The variation range of yield gap between maximum attainable yield and farmers yield under different N fertilizer applications was -0.4 to 3.4 t ha-1 and 0 to 2.5 t ha-1 for 2007 and 2008, respectively. The assessment of applied N fertilizer on farms indicated that nearly all of the farms had applied N fertilizer the lower than 171 kg ha-1. Therefore, it is expected that there is a yield gap derived N fertilizer on farms. The results showed that in a given level of N fertilizer in both simulation and farm conditions, the yield gaps are different. This can be related to difference between implemented agronomic practices under simulation and farm conditions.
机译：为了评估氮肥对小麦农场产量缺口（最大可得产量与实际产量之间的差异）的影响，使用CropSyst模型和2007年至2008年在伊朗Gorgan进行的农场调查研究进行了长期模拟。因此，在研究区域的常规农业实践条件下，在不同的氮肥处理（0至300 kg ha-1）之后，进行了产量模拟。使用两段回归模型分别估算了最佳氮肥施用量和最大可达到产量，分别为171 kg N ha-1和5.6 t ha-1。最大可获得产量与其他模拟可获得产量之间的产量差距为0.5至3.6 t ha-1。看来产量差距是氮肥缺乏的结果。产量差距越大，氮肥施用量越低。在2007年和2008年，不同氮肥用量下最大可获得产量与农民产量之间的产量差距变化范围分别为-0.4至3.4 t ha-1和0至2.5 t ha-1。对农场施用的氮肥的评估表明，几乎所有农场都施用了低于171 kg ha-1的氮肥。因此，预计在农场上会存在因产量差异而产生的氮肥。结果表明，在模拟水平和农场条件下，在给定水平的氮肥条件下，产量差距是不同的。这可能与模拟和农场条件下实施的农艺措施之间的差异有关。

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