Drainage water recycling (DWR) involves capture, storage, and reuse of surface and subsurface drainage water as irrigation to enhance crop production during critical times of the growing season. Our objectives were to synthesize 53 site-years of data from 1996 to 2017 in the midwestern United States to determine the effect of DWR using primarily subirrigation on corn (Zea mays L.) grain yield and yield variability and to identify precipitation factors at key stages of corn development (V1–V8, V9–VT, R1–R2, R3–R4, and R5–R6) that correlated to an increase in yield with DWR. A generalized additive model was used to quantify and characterize the relationship between precipitation and corn grain yield during corn development stages and to determine if that relationship differed between DWR and free drainage (FD). Corn yield response to precipitation was generally similar between DWR and FD, except during the critical period of V9–R2, in which DWR was more resilient to precipitation extremes than FD. Drainage water recycling was generally more responsive than FD in years with low and normal precipitation (<181 mm). When precipitation was low (27–85 mm) from V9 to R2, DWR had higher yields (77% of the site-years evaluated), with an average yield increase of 3.6 Mg ha⁻¹ (1.2–7.5 Mg ha⁻¹). Overall, FD had 28% greater yield variability than DWR. Additional research is needed on DWR impacts on different soils and locations throughout this region to improve the stability of corn yields and to develop automated DWR systems for enhancing efficiency of water management with increasing climate variability.

中文翻译：

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美国中西部地下排水对玉米产量的响应

排水再循环（DWR）涉及将表层和地下排水作为水的收集，存储和再利用，以灌溉作物，从而在生长季节的关键时期提高农作物的产量。我们的目标是合成1996年至2017年美国中西部地区53个站点-年的数据，以确定主要使用地下灌溉对玉米（Zea mays）的DWR的影响L.）谷物产量和产量变异性，并确定玉米发育关键阶段（V1-V8，V9-VT，R1-R2，R3-R4和R5-R6）的降水因子，这些因子与DWR的增加相关。使用通用的加性模型来量化和表征玉米发育阶段降水与玉米籽粒产量之间的关系，并确定DWR和自由排水（FD）之间的关系是否不同。DWR和FD之间，玉米产量对降水的响应通常相似，不同的是在V9–R2的关键时期，DWR比FD更能抵抗极端降水。在降水量少且正常的年份（<181毫米）中，排水循环通常比FD响应更快。当从V9到R2的降水量低（27-85 mm）时，^-1（1.2-7.5 Mg ha ^-1）。总体而言，FD与DWR相比具有28％的产量变异性。需要进一步研究DWR对整个地区不同土壤和位置的影响，以提高玉米产量的稳定性，并开发自动化DWR系统，以提高气候变化带来的水资源管理效率。