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You searched for: Author "W. M. Iversen" Remove constraint Author: "W. M. Iversen"
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1. Field performance of three real-time moisture sensors in sandy loam and clay loam soils

Author:
W. M. Iversen,   et al.   ; J. D. Jabro; W.B. Stevens;     Show all 3 Authors
Source:
Archiv für Acker- und Pflanzenbau und Bodenkunde 2018 v.64 no.7 pp. 930-938
ISSN:
1476-3567
Subject:
clay loam soils; field capacity; grasses; irrigation scheduling; sandy loam soils; soil water; time domain reflectometry; water content; weather
Abstract:
... The study was conducted to evaluate HydraProbe (HyP), Campbell Time Domain Reflectometry (TDR) and Watermarks (WM) moisture sensors for their ability to estimate water content based on calibrated neutron probe (NP) measurements. The three sensors were in-situ tested under natural weather conditions over a 3-yr period in a sandy loam and clay loam soils planted to grass. The HyP, TDR and WM sensors ...
DOI:
10.1080/03650340.2017.1393528

2. Nondestructive Analysis of Three-dimensional Objects using a Fluid Displacement Method

Author:
W. M. Iversen,   et al.   ; J. D. Jabro;     Show all 2 Author
Source:
Soil Science Society of America journal 2015 v.79 no.5 pp. 1289-1292
ISSN:
0361-5995
Subject:
equipment design; equipment performance; macropores; microprocessors; models; nondestructive methods; roots; sugar beet; surface area; surface tension
Abstract:
... Quantification of three-dimensional (3-D) objects has been a real challenge in agricultural, hydrological, and environmental studies. We designed and tested a method that is capable of quantifying 3-D objects using measurements of fluid displacement. The device consists of a stand that supports a movable platform to which the sample is attached. The sample is lowered by measured increments into a ...
Handle:
10113/61790
DOI:
10.2136/sssaj2015.06.0215

3. Integrated decision support, sensor networks and adaptive control for wireless site-specific sprinkler irrigation

Author:
W. M. Iversen,   et al.   ; R. G. Evans; Y. Kim;     Show all 3 Authors
Source:
Applied engineering in agriculture 2012 v.28 no.3 pp. 377-387
ISSN:
0883-8542
Subject:
computers; controllers; crops; decision making; decision support systems; environmental sustainability; global positioning systems; growers; irrigation rates; radio waves; sensors (equipment); sprinkler irrigation; sprinklers; user interface; variable rate application; water use efficiency; wireless technology
Abstract:
... The development of site-specific water management systems for sprinkler irrigation will be a major factor in future efforts to improve the various efficiencies of water-use and to support a sustainable irrigated environment. The challenge is to develop fully integrated management systems with supporting elements that accurately and inexpensively sense within-field variability and then optimally co ...
Handle:
10113/57111

4. Repeated Freeze-Thaw Cycle Effects on Soil Compaction in a Clay Loam in Northeastern Montana

Author:
W. M. Iversen,   et al.   ; J. D. Jabro; R. G. Evans; B. L. Allen; W. B. Stevens;     Show all 5 Authors
Source:
Soil Science Society of America journal 2014 v.78 no.3 pp. 737-744
ISSN:
0361-5995
Subject:
clay; clay loam soils; compacted soils; crop production; deep tillage; freeze-thaw cycles; soil aggregation; soil compaction; soil penetration resistance; soil profiles; soil quality; soil structure; weather; winter; Montana
Abstract:
... In recent years, there has been an increased global concern regarding the impact of soil compaction on crop production and soil quality in modern mechanized agricultural farming systems. Farm equipment is heavier than ever before, and many farmers have resorted to energy intensive deep tillage to alleviate compaction. Freeze-thaw processes influence the physical properties of soil, primarily soil ...
Handle:
10113/59389
DOI:
10.2136/sssaj2013.07.0280

5. Crop Diversification, Tillage, and Management System Influence Spring Wheat Yield and Water Use

Author:
W. M. Iversen,   et al.   ; A. W. Lenssen; U. M. Sainju; J. D. Jabro; B. L. Allen; R. G. Evans;     Show all 6 Authors
Source:
Agronomy journal 2014 v.106 no.4 pp. 1445-1454
ISSN:
0002-1962
Subject:
Hordeum vulgare; Pisum sativum; Triticum aestivum; Zea mays; barley; continuous cropping; conventional tillage; corn; crop rotation; crop yield; crop-weed competition; fertilizer application; field experimentation; integrated crop management; management systems; nitrogen fertilizers; no-tillage; peas; plant available water; plant density; planting date; soil productivity; soil quality; soil water content; spring wheat; water use efficiency
Abstract:
... Depleted soil quality, decreased water availability, and increased weed competition constrain spring wheat production in the northern Great Plains. New management systems are necessary for improved crop productivity. The objective of our study was to compare productivity and soil water use of spring wheat (Triticum aestivum L.) in four crop rotations (continuous wheat, wheat–pea [Pisum sativum L.] ...
Handle:
10113/59068
DOI:
10.2134/agronj14.0119

6. Water Use and Water Productivity of Sugarbeet, Malt Barley, and Potato as Affected by Irrigation Frequency

Author:
W. M. Iversen,   et al.   ; J. D. Jabro; R. G. Evans; W. B. Stevens;     Show all 4 Authors
Source:
Agronomy journal 2012 v.104 no.6 pp. 1510-1516
ISSN:
0002-1962
Subject:
sprinklers; Solanum tuberosum; soil depth; crop yield; potatoes; irrigation scheduling; roots; long term experiments; Hordeum vulgare; environmental quality; drainage; sugar beet; soil water content; sucrose; sprinkler irrigation; crop rotation; Beta vulgaris; malting barley; experimental design; water use efficiency; irrigation rates; plant cultural practices; semiarid soils; soil profiles; sandy loam soils; Great Plains region
Abstract:
... Successful irrigation management is one of the most important agronomic practices for achieving profitable yield and maximizing crop water productivity (CWP) while maintaining environmental quality by minimizing water losses to runoff and deep drainage. This study was conducted to compare the influence of two irrigation frequencies on crop water use (CWU) and CWP of sugarbeet (Beta vulgaris L.), m ...
Handle:
10113/56475
DOI:
10.2134/agronj2012.0169

7. Yield, Pests, and Water Use of Durum and Selected Crucifer Oilseeds in Two-Year Rotations

Author:
W. M. Iversen,   et al.   ; A. W. Lenssen; U. M. Sainju; T. C. Caesar-TonThat; S. L. Blodgett; B. L. Allen; R. G. Evans;     Show all 7 Authors
Source:
Agronomy journal 2012 v.104 no.5 pp. 1295-1304
ISSN:
0002-1962
Subject:
no-tillage; Crambe abyssinica; durum wheat; Brassica juncea; oilseeds; grain yield; fallow; seed oils; dryland farming; Triticum turgidum subsp. durum; oilseed crops; weeds; seed yield; crop rotation; arthropod pests; pest management; water use efficiency; Plutella xylostella; Camelina sativa; crops; Montana
Abstract:
... Cool-season oilseed crops are potential feedstock for biofuel production, but few studies have compared oilseed-durum (Triticum durum Desf.) rotations on yield, quality, water use, and pests associated with crops. We conducted an experiment under dryland conditions during 2007 to 2010 near Culbertson, MT, comparing crop productivity, water balance, and key weed and arthropod pests of 2-yr oilseed- ...
Handle:
10113/57103
DOI:
10.2134/agronj2012.0057