Field stresses such as salinity and fertility stresses affect on stomatal resistance and evapotranspiration (ET). But the effects of these stresses were ignored in the determination of ET and irrigation requirement. The present study investigated evapotranspiration (ET) and available moisture for maize SC 704 under salinity and fertility stresses. Treatments of saline water were 0.5 $$\left( {{\text{S}}_{0} } \right)$$ S 0 , 2.1 $$\left( {{\text{S}}_{1} } \right)$$ S 1 , 3.5 $$\left( {{\text{S}}_{2} } \right)$$ S 2 , and 5.7 $$\left( {{\text{S}}_{3} } \right){ }$$ S 3 dS m −1 . Four nitrogen fertilization levels of 100% $$\left( {{\text{N}}_{0} } \right)$$ N 0 , 75% $$\left( {{\text{N}}_{1} } \right)$$ N 1 , 50% $$\left( {{\text{N}}_{2} } \right)$$ N 2 and 25% $$\left( {{\text{N}}_{3} } \right)$$ N 3 based on fertilizer tests were consumed. Irrigation times were determined based on stomatal resistance measurement. The results showed that stresses increased the stomatal resistance. ET stress coefficients ( K s ) were measured between 0.63 and 1 in 2017 and between 0.62 and 1 in 2018. Polynomial function had the best performance in estimating of K s coefficients. Also, the range of the RAW (readily available water) for stressed and control plants was estimated at 42% to 66.5% in 2017 and 41.5% to 67% in 2018. Results showed that linear and exponential models performed well in estimating of RAW. An accurate estimation of ET and RAW made irrigation schedule more accurate. Due to reduced ET and plant water uptake in salinity and fertility stresses, the volume of irrigation water can be reduced relative to standard conditions. This will lead to reduce water use and water footprint.

中文翻译：

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盐度和肥力胁迫改变了玉米中的 Ks 和现成的水分系数（案例研究：Qazvin 地区）

田间压力如盐度和肥力压力会影响气孔阻力和蒸散量 (ET)。但是在确定 ET 和灌溉需求时忽略了这些压力的影响。本研究调查了在盐度和肥力胁迫下玉米 SC 704 的蒸散量 (ET) 和可用水分。盐水处理为 0.5 $$\left( {{\text{S}}_{0} } \right)$$ S 0 , 2.1 $$\left( {{\text{S}}_{1} } \right)$$ S 1 , 3.5 $$\left( {{\text{S}}_{2} } \right)$$ S 2 和 5.7 $$\left( {{\text{S} }_{3} } \right){ }$$ S 3 dS m −1 。四个氮肥水平 100% $$\left( {{\text{N}}_{0} } \right)$$ N 0 , 75% $$\left( {{\text{N}}_{ 1} } \right)$$ N 1 , 50% $$\left( {{\text{N}}_{2} } \right)$$ N 2 和 25% $$\left( {{\text {N}}_{3} } \right)$$ 基于肥料测试的 N 3 被消耗。根据气孔阻力测量确定灌溉时间。结果表明，胁迫增加了气孔阻力。2017 年测得的 ET 应力系数 ( K s ) 介于 0.63 和 1 之间，2018 年测得的介于 0.62 和 1 之间。多项式函数在估计 K s 系数方面表现最佳。此外，2017 年和 2018 年，胁迫和对照植物的 RAW（易得水）范围估计为 42% 至 66.5%，2018 年为 41.5% 至 67%。结果表明，线性和指数模型在估计 RAW 方面表现良好。ET 和 RAW 的准确估计使灌溉计划更加准确。由于盐度和肥力胁迫下 ET 和植物吸水量减少，灌溉水量可以相对于标准条件减少。这将导致减少用水和水足迹。