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首页> 外文学位 >Reducing water use, runoff volume, and nutrient movement for container nursery production by scheduling irrigation based on plant daily water use.
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Reducing water use, runoff volume, and nutrient movement for container nursery production by scheduling irrigation based on plant daily water use.

机译：通过根据植物的日常用水量安排灌溉时间，减少容器苗圃生产的用水量，径流量和养分流失。

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摘要

Daily water use (DWU) was used in two irrigation studies over two seasons to schedule irrigation. Plant DWU was determined from the difference in substrate volumetric water content over a 24 h period as measured using soil moisture sensors. Each year, irrigation was applied daily to container-grown shrubs in four treatments: 1) control application of 19 mm.ha-1.d-1, 2) irrigation applied to replace 100% DWU (100DWU) each day, 3) applications alternating 100% DWU with 75% DWU in a 2-day cycle (100-75), and 4) a 3-day application cycle replacing 100% DWU the first day and 75% DWU on the second and third days (100-75-75). The objectives between the two studies were to 1) determine whether irrigating with DWU can save water compared to a control (time-based application) rate without affecting growth of ornamental shrubs and 2) classify each taxon into irrigation functional groups (IFG). Most taxa in DWU treatments received less water than the control, yet only growth index of one taxa was negatively affected by deficit irrigation applications. Additionally, an objective of the second study was to quantify runoff volume and nutrient content from production areas irrigated under the same irrigation treatments. Effluent volumes and NO3- -N and PO43- -P loads from DWU treatments were reduced compared to the control. Consequently, irrigating based on DWU also reduced NO3 - -N and PO43--P losses and improved %P and %K foliar concentrations compared to the control.
机译：在两个季节的两次灌溉研究中都使用了每日用水量（DWU）来安排灌溉时间。根据使用土壤湿度传感器测量的24小时内底物体积水含量的差异确定植物DWU。每年，通过四种处理方式每天对容器生长的灌木进行灌溉：1）对照应用19 mm.ha-1.d-1，2）灌溉每天用于替代100％DWU（100DWU），3）应用在2天的周期（100-75）中交替使用100％DWU和75％DWU，以及4）3天的应用周期，第一天替换100％DWU，第二天和第三天替换100％DWU（100-75） -75）。两项研究之间的目标是：1）确定在不影响观赏灌木生长的情况下，与对照（基于时间的施药）速率相比，DWU灌溉是否可以节水，以及2）将每个分类单元划分为灌溉功能组（IFG）。在DWU处理中，大多数分类单元得到的水少于对照，但只有一种分类单元的生长指数受到灌溉不足的不利影响。此外，第二项研究的目的是量化在相同灌溉条件下灌溉的生产区的径流量和养分含量。与对照相比，DWU处理的出水量和NO3- -N和PO43--P负荷减少了。因此，与对照相比，基于DWU的灌溉还减少了NO3- -N和PO43-P的损失，并提高了％P和％K的叶面浓度。

著录项

  • 作者

    Pershey, Nicholas Andrew.;

  • 作者单位

    Michigan State University.;

  • 授予单位 Michigan State University.;
  • 学科 Agriculture Horticulture.;Water Resource Management.
  • 学位 M.S.
  • 年度 2014
  • 页码 162 p.
  • 总页数 162
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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