Development and Evaluation of a Variable-Rate Irrigation Management Method in the Mississippi Delta

IF 1.4 4区 农林科学 Q3 AGRICULTURAL ENGINEERING
R. Sui, J. Baggard
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引用次数: 0

Abstract

HighlightsWe developed and evaluated a variable-rate irrigation (VRI) management method for five crop years in the Mississippi Delta.VRI management significantly reduced irrigation water use in comparison with uniform-rate irrigation (URI). There was no significant difference in grain yield and irrigation water productivity between VRI and URI management.Soil apparent electrical conductivity (ECa) was used to delineate irrigation management zones and generate VRI prescriptions.Sensor-measured soil water content was used in irrigation scheduling.Abstract. Variable-rate irrigation (VRI) allows producers to site-specifically apply irrigation water at variable rates within a field to account for the temporal and spatial variability in soil and plant characteristics. Developing practical VRI methods and documenting the benefits of VRI application are critical to accelerate the adoption of VRI technologies. Using apparent soil electrical conductivity (ECa) and soil moisture sensors, a VRI method was developed and evaluated with corn and soybean for five crop years in the Mississippi Delta. Soil ECa of the study fields was mapped and used to delineate VRI management zones and create VRI prescriptions. Irrigation was scheduled using soil volumetric water content measured by soil moisture sensors. A center pivot VRI system was employed to deliver irrigation water according to the VRI prescription. Grain yield, irrigation water use, and irrigation water productivity in the VRI treatment were determined and compared with that in a uniform-rate irrigation (URI) treatment. Results showed that the grain yield and irrigation water productivity between the VRI and URI treatments were not statistically different with both corn and soybean crops. The VRI management significantly reduced the amount of irrigation water by 22% in corn and by 11% in soybean (p = 0.05). Adoption of VRI management could improve irrigation water use efficiency in the Mississippi Delta. Keywords: Soil electrical conductivity, Soil moisture sensor, Variable rate irrigation, Water management.
密西西比三角洲变速率灌溉管理方法的发展与评价
我们开发并评估了密西西比三角洲5个作物年的可变速率灌溉(VRI)管理方法。与等速灌溉(URI)相比,VRI管理显著减少了灌溉用水。VRI管理与URI管理在粮食产量和灌溉水生产力方面无显著差异。利用土壤视电导率(ECa)来划定灌溉治理区域,生成VRI处方。在灌溉调度中,利用传感器测量土壤含水量。可变速率灌溉(VRI)使生产者能够根据土壤和植物特性的时空变化,在田间以可变速率特定地点施用灌溉水。开发实用的VRI方法和记录VRI应用的好处对于加速VRI技术的采用至关重要。利用土壤电导率(ECa)和土壤水分传感器,在密西西比三角洲开发了一种VRI方法,并对玉米和大豆进行了5个作物年的评估。绘制了研究田的土壤ECa,并用于划定VRI管理区和制定VRI处方。利用土壤水分传感器测量的土壤体积含水量来安排灌溉。采用中心枢轴式VRI系统按VRI处方输送灌溉水。测定了VRI处理的籽粒产量、灌溉水用量和灌溉水生产力,并与等速灌溉(URI)处理进行了比较。结果表明,玉米和大豆作物在VRI和URI处理间的粮食产量和灌溉水生产力无统计学差异。VRI管理显著减少玉米22%和大豆11%的灌溉水量(p = 0.05)。采用VRI管理可以提高密西西比三角洲的灌溉用水效率。关键词:土壤电导率,土壤水分传感器,变量灌溉,水分管理
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来源期刊
Transactions of the ASABE
Transactions of the ASABE AGRICULTURAL ENGINEERING-
CiteScore
2.30
自引率
0.00%
发文量
0
审稿时长
6 months
期刊介绍: This peer-reviewed journal publishes research that advances the engineering of agricultural, food, and biological systems. Submissions must include original data, analysis or design, or synthesis of existing information; research information for the improvement of education, design, construction, or manufacturing practice; or significant and convincing evidence that confirms and strengthens the findings of others or that revises ideas or challenges accepted theory.
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