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You searched for: Author "William M. Iversen" Remove constraint Author: "William M. Iversen"
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1. Soil cone index and bulk density of a sandy loam under no-till and conventional tillage in a corn-soybean rotation

Author:
William M. Iversen,   et al.   ; Jalal D. Jabro; William B. Stevens; Upendra M. Sainju; Brett L. Allen;     Show all 5 Authors
Source:
Soil & tillage research 2021 v.206 pp. 104842
ISSN:
0167-1987
Subject:
Glycine max; Zea mays; bulk density; conventional tillage; corn; crop rotation; disturbed soils; gravimetric water content; intensive cropping; no-tillage; sandy loam soils; soil density; soil strength; soybeans
Abstract:
... Tillage practices may have a profound impact on both soil environment and agricultural productivity. A field study was carried out from 2013 to 2019 to investigate the effect of no-till (NT) and conventional tillage (CT) on soil cone index (CI), bulk density (ρb), and gravimetric water content (θₘ) in a 2-yr corn (Zea mays L.)-soybean (Glycine max [L.]) rotation on a Lihen sandy loam. The study wa ...
Handle:
10113/7160757
DOI:
10.1016/j.still.2020.104842

2. Tillage Effects on Drainage Fluxes and Nitrate Leaching through Unsaturated Zone under Irrigated Corn-Soybean Rotation

Author:
William M. Iversen,   et al.   ; Jay D. Jabro; Willam B. Stevens; Upendra M. Sainju; Brett L. Allen;     Show all 5 Authors
Source:
Applied engineering in agriculture 2019 v.35 no.3 pp. 293-300
ISSN:
0883-8542
Subject:
Glycine max; Zea mays; conventional tillage; corn; cropping systems; drainage; drainage water; drinking water; environmental quality; groundwater; irrigation management; leaching; lysimeters; nitrate nitrogen; nitrates; no-tillage; poly(vinyl chloride); sandy loam soils; soybeans; surface area; Great Plains region
Abstract:
... High levels of nitrate-nitrogen (NO(3-)N) in the nation’s groundwater are a significant environmental concern. To date no studies have yet evaluated the effects of various tillage practices on percolated drainage and NO(3-)N fluxes below the rootzone of cropping systems in the northern Great Plains. A field study was conducted to examine and compare the effect of no-tillage (NT) and conventional t ...
DOI:
10.13031/aea.13127

3. Soil water and crop water use with crop rotations and cultural practices

Author:
William M. Iversen,   et al.   ; Upendra M. Sainju; Andrew W. Lenssen; Brett L. Allen; Jalal D. Jabro; William B. Stevens;     Show all 6 Authors
Source:
Agronomy 2020 v.112 no.5 pp. 3306-3321
ISSN:
0002-1962
Subject:
Brassica napus; Linum usitatissimum; Pisum sativum; Triticum turgidum; arid lands; canola; conventional tillage; crop rotation; durum wheat; fertilizer application; flax; grain yield; nitrogen fertilizers; no-tillage; semiarid zones; soil water; soil water storage; sowing; stubble; water use efficiency; Great Plains region
Abstract:
... Limited and erratic precipitation in arid and semiarid regions can affect soil water storage, water use, and dryland crop performance. Our objective was to examine soil water content, crop yield, and water‐use efficiency (WUE) with crop rotations and cultural practices for 6 yr in the northern Great Plains. Crop rotations were durum wheat (or durum) (Triticum turgidum L.)−durum−canola (Brassica na ...
Handle:
10113/7071232
DOI:
10.1002/agj2.20332

4. Impact of conservation tillage and nitrogen on sugarbeet yield and quality

Author:
William M. Iversen,   et al.   ; Reza Keshavarz Afshar; Abdelaziz Nilahyane; Chengci Chen; Huaqin He; W. Bart Stevens;     Show all 6 Authors
Source:
Soil & tillage research 2019 v.191 pp. 216-223
ISSN:
0167-1987
Subject:
Beta vulgaris; conventional tillage; cost estimates; crop yield; field experimentation; growers; labor; molasses; nitrogen; no-tillage; potassium; reduced tillage; sodium; soil; strip tillage; sucrose; sugar beet
Abstract:
... Conventional intensive tillage (CT) is widely practiced in sugarbeet (Beta vulgaris L.) growing regions. However, CT uses more labor and machinery and has negative impacts on soil and environment. Limited information exists for the performance of sugarbeet in reduced tillage compared to CT systems. A three-year field experiment was conducted to evaluate yield and quality of sugarbeet under no-till ...
DOI:
10.1016/j.still.2019.03.017

5. A New Automated Passive Capillary Lysimeter for Logging Real-Time Drainage Water Fluxes

Author:
William M. Iversen,   et al.   ; Jay D. Jabro; William B. Stevens; Brett L. Allen; Upendra M. Sainju;     Show all 5 Authors
Source:
Applied engineering in agriculture 2017 v.33 no.6 pp. 849-857
ISSN:
0883-8542
Subject:
agricultural engineering; corn; cropping systems; drainage; drainage water; instrumentation; logging; lysimeters; microprocessors; monitoring; rhizosphere; sandy loam soils; soil profiles; soil temperature; soil water; soybeans; sprinkler irrigation; statistical analysis; surface area; vadose zone; water potential
Abstract:
... Effective monitoring of chemical transport through the soil profile requires accurate and appropriate instrumentation to measure drainage water fluxes below the root zone of cropping systems. The objectives of this study were to methodically describe in detail the construction and installation of a novel automated PCAP (passive capillary) lysimeter design, and to evaluate the efficacy of this desi ...
DOI:
10.13031/aea.12433

6. Malt Barley Yield and Quality Affected by Irrigation, Tillage, Crop Rotation, and Nitrogen Fertilization

Author:
William M. Iversen,   et al.   ; William B. Stevens; Upendra M. Sainju; Thecan Caesar-TonThat;     Show all 4 Authors
Source:
Agronomy journal 2015 v.107 no.6 pp. 2107-2119
ISSN:
0002-1962
Subject:
Conservation Reserve Program; Hordeum vulgare; Pisum sativum; biomass; conventional tillage; crop rotation; cropland; grain protein; grain quality; grain yield; irrigation; malt; malting barley; nitrogen fertilizers; no-tillage; plant protein concentrates; sandy loam soils; North Dakota
Abstract:
... Little is known about the comparison of management practices on malt barley (Hordeum vulgare L.) yield and quality in irrigated and non-irrigated cropping systems. We evaluated the effects of irrigation, tillage, cropping system, and N fertilization on malt barley yield and quality in a sandy loam soil from 2005 to 2011 in croplands converted from Conservation Reserve Program in western North Dako ...
Handle:
10113/61564
DOI:
10.2134/agronj15.0027

7. Suction Cup Samplers for Estimating Nitrate-Nitrogen in Soil Water in Irrigated Sugarbeet Production

Author:
William M. Iversen,   et al.   ; Jay D. Jabro; William B. Stevens; Brett L. Allen; Upendra M. Sainju;     Show all 5 Authors
Source:
Journal of Environmental Protection 2016 v.07 no.10 pp. 1342-1354
ISSN:
2152-2197
Subject:
Beta vulgaris; agricultural land; ceramics; clay loam soils; conventional tillage; environmental protection; fertilizer rates; groundwater; growing season; irrigation; leaching; measuring devices; nitrate nitrogen; nitrates; nitrogen; nitrogen fertilizers; preferential flow; samplers; soil heterogeneity; soil profiles; soil water; strip tillage; sugar beet; urea
Abstract:
... Efforts have been increased to measure nitrate losses from farmland under different management practices due to environmental and public concerns over levels of nitrate-nitrogen (NO3-N) in surface and ground waters. This study evaluated the effect of conventional tillage (CT) and strip tillage (ST) practices and three N application rates on NO3-N leaching below 76 cm depth under irrigated sugarbee ...
Handle:
10113/63189
DOI:
10.4236/jep.2016.710117

8. Spatial and Temporal Variability of Soil Penetration Resistance Transecting Sugarbeet Rows and Inter-Rows in Tillage Systems

Author:
William M. Iversen,   et al.   ; Jay D. Jabro; William B. Stevens; Robert G. Evans;     Show all 4 Authors
Source:
Applied engineering in agriculture 2015 v.31 no.2 pp. 237-246
ISSN:
0883-8542
Subject:
clay; steel; clay loam soils; conventional tillage; growing season; planting; root growth; row spacing; soil compaction; soil heterogeneity; soil map; soil penetration resistance; soil quality; soil water; soil water content; spatial variation; strip tillage; sugar beet; temporal variation; Montana
Abstract:
... Soil compaction has detrimental consequences on soil quality and plant root growth. Soil compaction is a variable property due to tillage in both space and time. A field study was conducted near Sidney, Montana in 2007 to evaluate spatial and temporal variations of soil penetration resistance (PR) on a 61-cm transect across the rows and inter-rows of sugarbeet on a clay loam in both conventional ( ...
Handle:
10113/60746
DOI:
10.13031/aea.31.10722

9. Effect of Three Tillage Depths on Sugarbeet Response and Soil Penetrability Resistance

Author:
William M. Iversen,   et al.   ; Jalal D. Jabro; William Bart Stevens; Robert G. Evans; Maysoon M. Mikha; Brett L. Allen;     Show all 6 Authors
Source:
Agronomy journal 2015 v.107 no.4 pp. 1481-1488
ISSN:
0002-1962
Subject:
Beta vulgaris; cold; crop yield; deep tillage; manual harvesting; no-tillage; roots; sandy loam soils; soil penetration resistance; soil water; spring; sucrose; sugar beet; weather
Abstract:
... Tillage can alter soil properties and affect crop yield and quality. A 4-yr study was conducted on a Lihen sandy loam soil loam (sandy, mixed, frigid Entic Haplustoll) to evaluate the effect of tillage depth on sugarbeet (Beta vulgaris L.) root yield, root quality, and soil penetration resistance (PR). Tillage treatments consisted of no-tillage (NT), shallow tillage (ST), and deep tillage (DT). So ...
Handle:
10113/61038
DOI:
10.2134/agronj14.0561

10. Strip Tillage and High-Efficiency Irrigation Applied to a Sugarbeet–Barley Rotation

Author:
William M. Iversen,   et al.   ; William B. Stevens; Robert G. Evans; Jalal D. Jabro; Upendra M. Sainju; Brett L. Allen;     Show all 6 Authors
Source:
Agronomy journal 2015 v.107 no.4 pp. 1250-1258
ISSN:
0002-1962
Subject:
Beta vulgaris; Hordeum vulgare; barley; conventional tillage; cost effectiveness; crop rotation; fertilizer application; fertilizers; grain yield; malting barley; soil; sprinkler irrigation; strip tillage; sugar beet; Montana
Abstract:
... Strip tillage (ST) and high-efficiency overhead irrigation methods reduce fuel and water inputs compared to conventional practices, but have not been extensively evaluated in sugarbeet (Beta vulgaris L.)–malt barley (Hordeum vulgare L.) cropping systems. A field study comparing conventional tillage (CT) and ST systems and two sprinkler irrigation methods (mid-elevation spray application, MESA; low ...
Handle:
10113/60754
DOI:
10.2134/agronj14.0525

11. Physical and hydraulic properties of a sandy loam soil under zero, shallow and deep tillage practices

Author:
William M. Iversen,   et al.   ; Jay D. Jabro; William B. Stevens; Robert G. Evans; Maysoon M. Mikha; Brett L. Allen;     Show all 6 Authors
Source:
Soil & tillage research 2016 v.159 pp. 67-72
ISSN:
0167-1987
Subject:
crops; deep tillage; no-tillage; porosity; sandy loam soils; saturated hydraulic conductivity; soil density; soil ecology; soil water content; water content
Abstract:
... The effect of tillage depth on physical properties in sandy soils under sugarbeet (Beta vulgaris L.) is not well understood and documented. A 4-yr study was conducted to investigate the effect of zero tillage (ZT), shallow tillage (ST), and deep tillage (DT) practices on soil bulk density (BD), saturated hydraulic conductivity (Ks), and moisture content (MC) in a sandy loam. Undisturbed soil cores ...
Handle:
10113/61898
DOI:
10.1016/j.still.2016.02.002

12. Irrigation System and Tillage Effects on Soil Carbon and Nitrogen Fractions

Author:
William M. Iversen,   et al.   ; Upendra M. Sainju; William B. Stevens; Robert G. Evans;     Show all 4 Authors
Source:
Soil Science Society of America journal 2013 v.77 no.4 pp. 1225-1234
ISSN:
0361-5995
Subject:
soil organic carbon; strip tillage; carbon sequestration; crop yield; ammonium nitrogen; stems; nitrate nitrogen; leaves; mineralization; Argiustolls; conventional tillage; crop residues; microbial activity; irrigation systems; nitrogen; clay loam soils; microbial biomass; soil treatment; irrigation rates; Montana
Abstract:
... Irrigation and tillage systems may affect surface residue and soil C and N fractions by influencing crop biomass yield, residue placement, and movement of water soluble C and N in the soil. We studied the effects of irrigation (mid-elevation spray application [MESA] and low energy precision application [LEPA]) and tillage (conventional [CT] and strip-tillage [ST]) systems on crop biomass (stems an ...
Handle:
10113/57101
DOI:
10.2136/sssaj2012.0412

13. Nitrogen Availability for Sugarbeet affected by Tillage System and Sprinkler Irrigation Method

Author:
William M. Iversen,   et al.   ; W. Bart Stevens; Robert G. Evans; Jay D. Jabro;     Show all 4 Authors
Source:
Agronomy journal 2010 v.102 no.6 pp. 1745-1752
ISSN:
0002-1962
Subject:
band placement; strip tillage; precision agriculture; crop yield; nitrate nitrogen; soil fertility; petioles; sugar beet; plant nutrition; soil water content; conventional tillage; crop residues; sprinkler irrigation; leaching; spatial variation; Beta vulgaris; nitrogen fertilizers; nitrogen; nutrient availability; Montana
Abstract:
... Many shank-type strip tillage (ST) implements band fertilizer below the seed without incorporating crop residue into the soil, potentially affecting N availability. Sprinkler irrigation method may also affect N availability due to its influence on water and NO₃–N movement in soil. A field study was conducted at Sidney, MT, to determine if sugarbeet (Beta vulgaris L.) petiole NO₃–N concentration an ...
Handle:
10113/50546
DOI:
10.2134/agronj2010.0122

14. Repeatability of soil apparent electrical conductivity measured by a coulter sensor

Author:
William M. Iversen,   et al.   ; Jay David Jabro; Robert G. Evans; William B. Stevens;     Show all 4 Authors
Source:
Soil science 2008 v.173 no.1 pp. 35-45
ISSN:
0038-075X
Subject:
electrical conductivity; agricultural soils; fields; clay loam soils; soil properties; soil depth; spatial variation; measurement; sandy loam soils
Abstract:
... Apparent electrical conductivity (ECa) measured using an on-the-go coulter sensor offers advantages for mapping soil variability because detailed data can be collected easily and inexpensively using on-the-go ECa sensors. However, there has been little research investigating the repeatability of these sensors, which may be defined as their ability to reproduce the same ECa measurement when operate ...
Handle:
10113/10719
DOI:
10.1097/ss.0b013e318159a608

15. Simulating Dryland Water Availability and Spring Wheat Production in the Northern Great Plains

Author:
William M. Iversen,   et al.   ; Zhiming Qi; Patricia N. S. Bartling; Jalal D. Jabro; Andrew W. Lenssen; Lajpat R. Ahuja; Liwang Ma; Brett L. Allen; Robert G. Evans;     Show all 9 Authors
Source:
Agronomy journal 2013 v.105 no.1 pp. 37-50
ISSN:
0002-1962
Subject:
Triticum aestivum; aboveground biomass; agricultural land; arid lands; climate; continuous cropping; costs and returns; dryland farming; fallow; field experimentation; grain yield; planting date; simulation models; soil water; soil water content; sowing; spring wheat; tillage; water conservation; water uptake; weather; Great Plains region
Abstract:
... Agricultural system models are useful tools to synthesize field experimental data and to extrapolate results to longer periods of weather and to other cropping systems. The objectives of this study were: (i) to quantify the effects of crop management practices and tillage on soil water and spring wheat (Triticum aestivum L.) production in a continuous spring wheat system using the RZWQM2 model (co ...
Handle:
10113/57415
DOI:
10.2134/agronj2012.0203

16. Characterization of spatial variability of soil electrical conductivity and cone index using coulter and penetrometer-type sensors

Author:
William M. Iversen,   et al.   ; Jay David Jabro; Robert G. Evans; Yunseup Kim; William B. Stevens;     Show all 5 Authors
Source:
Soil science 2006 v.171 no.8 pp. 627-637
ISSN:
0038-075X
Subject:
electrical conductivity; soil strength; geostatistics; precision agriculture; spatial variation; measurement; penetrometers
Abstract:
... Assessment and management of spatial variability of soil chemical and physical properties (e.g., soil texture, organic matter, salinity, compaction, and nutrient content) are very important for precision farming. With current advances in sensing technology, soil electrical conductivity (EC) mapping is considered the most efficient and inexpensive method that can provide useful information about so ...
Handle:
10113/29291
DOI:
10.1097/01.ss.0000228037.80270.1d