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Modelling the relationships between the yield and evapotranspiration of maize under salinity stress and nitrogen deficiency

机译:盐胁迫和缺氮条件下玉米产量与蒸散量的关系模拟

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Abstract Understanding the intraseasonal sensitivity of crop evapotranspiration (ET) to stresses allows for accurate modelling of crop yield. In this research, the effects of water salinity stress and soil nitrogen deficiency on evapotranspiration (in the growth stages) and maize yield in 2017 and 2018 were investigated. Four treatments of saline water levels of 0.5 (S0), 2.1 (S1), 3.5 (S2) and 5.7 (S3) dS m−1 were combined with four nitrogen fertilization levels of 100 (N0), 75 (N1), 50 (N2) and 25 (N3). The maize ET amounts from the S0N0 to S3N3 treatments decreased from 80 to 55 mm (in the initial stage), 202 to 129 mm (in development), 127 to 80 mm (in the mid) and 14.5 to 10.5 mm (in the late). The dry biomass yield of maize from the S0N0 to S3N3 treatments was equal to 15.3 to 9.23 t.ha−1. The relative yield of maize was modelled by the additive models of Blank, Stewart and Singh and the multipliable models of Jensen, Rao and Minhas. The results showed that the Stewart and Jensen models were selected as the optimal models. By using the optimal models, the relative yield of maize can be modelled based on the evapotranspiration rate (in the growth stages) under salinity stress and nitrogen deficiency.
机译:摘要 了解作物蒸散(ET)对胁迫的季节内敏感性,可以对作物产量进行准确建模。本研究考察了2017年和2018年水盐胁迫和土壤缺氮对2017年和2018年玉米蒸散(生育期)和产量的影响。以0.5(S0)、2.1(S1)、3.5(S2)和5.7(S3)dS m−14个盐水处理为基准,施氮量为100%(N0)、75%(N1)、50%(N2)和25%(N3)。S0N0至S3N3处理的玉米ET量从80-55 mm(初期)、202-129 mm(发育中)、127-80 mm(中期)和14.5-10.5 mm(后期)减少。S0N0—S3N3处理玉米干生物量产量为15.3—9.23 t.ha−1。玉米的相对产量由Blank、Stewart和Singh的加法模型以及Jensen、Rao和Minhas的多柔性模型建模。结果表明,Stewart和Jensen模型被选为最优模型。利用最优模型,可以根据盐胁迫和缺氮条件下的蒸散速率(生育期)对玉米的相对产量进行建模。

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