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Field studies and simulations of corn yield response to nonuniform and deficit irrigation.

机译：玉米产量对不均匀和亏缺灌溉的响应的田间研究和模拟。

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摘要

Three experimental field studies were conducted to evaluate an irrigation catch device (IrriGage), sprinkler irrigation cyclical nonuniformity effects on corn yield, and compare an ET-based irrigation scheduling tool (KanSched) with a crop growth model (CERES-Maize) for reduced irrigation effects on seven corn production sites under south central Kansas environmental conditions.; Field studies under three different sprinkler packages (fixed-plate, grooved-disk, FP; spinning plate, SP; and wobbling plate, WP) were conducted to evaluate the measurement accuracy of 10 cm diameter IG10 collectors in south central and north east Kansas. IG10 collectors can accurately measure irrigation depth and uniformity under SP and WP sprinkler packages but not FP sprinkler packages. Under FP sprinkler irrigation packages collectors with 15.2 cm or larger diameter openings should be considered.; Fixed-plate sprinklers produce larger droplets that are less susceptible to wind distortion and evaporative losses. One of the major concerns with these sprinkler packages is a cyclical (periodic) nonuniform irrigation pattern. A study was conducted on a coarse textured soil to evaluate the effect of cyclical, nonuniform, deficit (65% of full irrigation) irrigation on corn yield. The low uniformity treatment had a coefficient of uniformity (CU) of 79 while the other two treatments had CU's of 91 and 92. Studies in 1999 and 2000 indicated that FP sprinkler package cyclical, nonuniform irrigation applications did not result in reduced corn yield.; Field studies were conducted on 7 corn production sites to evaluate corn yield response to deficit irrigation in south central Kansas. Those data were also used to evaluate the KanSched program. That program was used to mimic the field soil water status and seasonal crop water use under deficit irrigation practices on those sites. Additionally, the CERES-Maize growth crop model was used to simulate crop water use and yield response to deficit irrigation. Overall, deficit irrigation applications reduced yield especially in drier years. The KanSched program irrigation schedule agreed with the field-based net applied irrigation amounts, but under-estimated crop water use compared to CERES-Maize. The CERES-Maize model did not mimic deficit irrigated corn yield in south central Kansas.
机译：进行了三个实验田间研究，以评估灌溉捕获装置（IrriGage），喷灌周期性不均匀性对玉米产量的影响，并将基于ET的灌溉调度工具（KanSched）与作物生长模型（CERES-玉米）进行比较以减少灌溉在堪萨斯中南部环境条件下对七个玉米生产地点的影响；在三种不同的洒水装置（固定板，沟槽盘，FP，纺丝板，SP和摆动板，WP）下进行了现场研究，以评估堪萨斯中南部和东北部直径10厘米的IG10收集器的测量精度。 IG10收集器可以在SP和WP喷头套件下而不是FP喷头套件下准确测量灌溉深度和均匀度。在FP洒水灌溉组件下，应考虑使用直径为15.2 cm或更大直径的集水器。固定板喷头产生较大的液滴，这些液滴不易受到风的扭曲和蒸发损失的影响。这些洒水装置的主要问题之一是周期性的（周期性的）非均匀灌溉模式。在粗糙的带纹理的土壤上进行了一项研究，以评估周期性，不均匀，亏缺（完全灌溉的65％）灌溉对玉米产量的影响。低均匀度处理的均匀系数（CU）为79，而其他两种处理的均匀系数（CU）为91和92。1999年和2000年的研究表明，周期性喷洒，不均匀灌溉的FP洒水装置不会导致玉米单产下降。在七个玉米生产基地进行了田间研究，以评估堪萨斯州中南部南部玉米对亏缺灌溉的产量响应。这些数据还用于评估KanSched程序。该程序被用来模拟田间土壤水分状况和在这些地点的亏水灌溉做法下的季节性作物用水。此外，使用CERES-玉米生长作物模型来模拟作物用水和产量对亏缺灌溉的响应。总体而言，亏水灌溉的应用降低了产量，尤其是在较干旱的年份。 KanSched计划灌溉时间表与基于田间使用的净灌溉量一致，但与CERES-玉米相比，作物用水量低估了。 CERES-玉米模型没有模拟堪萨斯州中南部的缺水灌溉玉米单产。

著录项

  • 作者

    Dogan, Ergun.;

  • 作者单位

    Kansas State University.;

  • 授予单位 Kansas State University.;
  • 学科 Engineering Agricultural.; Agriculture Soil Science.; Agriculture Agronomy.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 196 p.
  • 总页数 196
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农业工程;土壤学;农学（农艺学）;
  • 关键词

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