Soil Sample Collection and Handling: Technique Based on Source and Degree of Field Variability

James, David W.; Wells, Kenneth L.

doi:10.2136/sssabookser3.3ed.c3

Cited by 35 publications

(28 citation statements)

References 18 publications

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“…Sample collection errors include collecting samples from an inconsistent depth, a depth different than what is recommended, or areas that are not representative of the entire field, grid or zone. The two types of variability associated with collecting soil samples include spatial variability (Sabbe and Marx, 1987;Trangmar et al, 1987;James and Wells, 1990;Mallarino, 1996;Lauzon et al, 2005;Grandt et al, 2010), both vertically and horizontally across a field, as well as temporal variability (Fine et al, 1940;James and Wells, 1990).…”

Section: Factors That Influence Soil Test Resultsmentioning

confidence: 99%

“…Tillage, banded and broadcast fertilizer applications, as well as the duration (e.g., number of years) of the practice influence horizontal nutrient distribution (Sabbe and Marx, 1987;James and Wells, 1990;Peck and Soltanpour, 1990;Mallarino, 1996). Lauzon et al (2005) concluded that 13 of the 23 fields they researched required grid spacing of <30 m to adequately characterize spatial variability of soil pH and STP and STK and suggested the commonly used 100-m grid size failed to adequately characterize field spatial variability.…”

Section: Factors That Influence Soil Test Resultsmentioning

confidence: 99%

“…showed that topography and geography alone had virtually no effect on the horizontal distribution of STP of grasslands used for livestock production. The removal of topsoil by erosion or land leveling practices can affect soil-test variability across a field as subsoil tends to be less fertile and productive and represents a form of both vertical and horizontal variability (James and Wells, 1990).…”

Section: Factors That Influence Soil Test Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Validation of Soil‐Test‐Based Phosphorus and Potassium Fertilizer Recommendations for Irrigated Soybean

Fryer

Slaton

Roberts

et al. 2019

Soil Science Soc of Amer J

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Credit should be given where credit is due. Credit is first due to my parents and family who have raised me well and prepared me for the season of life that I am now in. They have always instilled wisdom and character in me. Although I am sure that I am unaware of far more than I am aware of, I remember and now understand the countless times and instances of their selfless love, sacrifice, and provision for me. All members of family have taught me, through example, the value of hard work, the importance of being thankful and content in all seasons of life, and the maturity of taking responsibility. Easily the most important thing they have taught me is how to love and represent Jesus rightly by pursuing a relationship with him and to do everything with excellence for him. They have showed me how to love and honor people and extend compassion in the way Jesus did. These lessons learned will excel me in anything I choose to pursue. Thank you Mom and Dad for past achieved victories and life obstacles you have overcome that I have been able to rest and grow under. I am forever indebted. The success I have achieved in this portion of my education and career has laid heavily on the shoulders of my advisor Dr. Nathan Slaton. When I started in his program, I struggled at being productive in my scientific writing and academic responsibilities. My thought process was underdeveloped, and understanding my research was a challenge. His patience and articulated instruction have helped me to develop far ahead of where I was when I began. My knowledge and understanding of agronomy, professionalism, and leadership have grown immensely under his guidance. His considerate yet stern and driven leadership has propelled and sharpened the knowledge and scientific thought process that I now have. His hard work, past achievements, and consistent desire to improve have been a source of wisdom and has prepared me to build a solid agronomic career. My time under Dr. Slaton's mentorship has truly been a blessing. The comradery and support of my friends and fellow coworkers Keith Center, Rasel Parvej, and Randy Dempsey have made graduate school enjoyable. I'm not sure how I would have made it through statistics without the help and countless study hours I shared with my good friend Keith Center. His friendship and late night assistance in the lab (even though we worked in separate departments), his willingness to listen in my times of frustration, and the times we spent goofing off have helped me to let go of stress and have fun. Thanks for all the help and great times buddy you've been a great friend! The comradery I received from my fellow graduate students Rasel and Randy made things around the office and lab a much more bearable. Thanks for the help with lab methods and virtually every computer program I encountered. I am very thankful to Russ and the ladies at the Altheimer Soil Lab for their help and patience with me as I learned my way around and, at times, took over large areas of their work space to complete my lab work. To the Arkan...

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Section: Factors That Influence Soil Test Resultsmentioning

confidence: 99%

Section: Factors That Influence Soil Test Resultsmentioning

confidence: 99%

Section: Factors That Influence Soil Test Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Validation of Soil‐Test‐Based Phosphorus and Potassium Fertilizer Recommendations for Irrigated Soybean

Fryer

Slaton

Roberts

et al. 2019

Soil Science Soc of Amer J

View full text Add to dashboard Cite

show abstract

“…James and Wells [49] postulated that soil chemical characteristics may vary in relation to the distance between two points of sample collection according to three scales: macrovariations (bigger than 2 meters), mesovariations (between 0.05 and 2 meters) and microvariations (less than 5 centimeters). Besides, adhered soil was not correlated to bone integrity decay, probably because not only soil chemistry or microorganisms but other factors such as humidity and temperature may also destroy osteocyte cells and contribute to decay of bone integrity index following burial.…”

Section: Fsi _2018mentioning

confidence: 99%

The impact of burial period on compact bone microstructure: Histological analysis of matrix loss and cell integrity in human bones exhumed from tropical soil

Astolphi

Alves

Evison

et al. 2019

Forensic Science International

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“…A recently developed soil-based N test called the Nitrogen-Soil Test for Rice, N-STaR, provides an index of potentially mineralizable-N that has been correlated and calibrated to 1990). Furthermore, the sampling tool must be user-friendly, which is defined as easy-to-use, clean, and store (Peck & Melsted, 1967;James & Wells, 1990).…”

Section: Introductionmentioning

confidence: 99%

Comparison of soil sampling techniques for alkaline hydrolyzable‐nitrogen on clay soils

Davidson¹,

Roberts²,

Hardke

et al. 2020

Agrosystems Geosci & Env

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The Nitrogen‐Soil Test for Rice (N‐STaR) provides a site‐specific N rate recommendation by quantifying alkaline hydrolyzable‐N (AH‐N). A user‐friendly method for obtaining a representative N‐STaR soil sample is needed, and this study was designed to evaluate the performance of alternative sampling techniques compared with the Dutch auger (DA). The alternative techniques included a Kleen Hole Spade dry (KHS‐D), a KHS lubricated with water (KHS‐W), a KHS lubricated with WD‐40 (KHS‐40), and the N‐STaR Bucket and Drill (BD). One soil sample was collected with each sampling technique from four blocks and was repeated across 14 sites. Each sample was analyzed for AH‐N using N‐STaR and compared against the DA. Variability in AH‐N ranged from a coefficient of variation (CV) of 4.4% at Site 3 to 22.3% at Site 5. The AH‐N at 13 of the 14 sites had no significant differences among sampling techniques. At Site 14, the AH‐N measured using the KHS‐40 was statistically higher than the DA by 25 mg AH‐N kg soil–1 and would correspond to a fertilizer N rate difference of 49 kg N ha–1. The KHS‐D probe appears to have the greatest accuracy and precision compared to the DA, although the KHS‐W, KHS‐40, and the BD produce similar results. All alternative techniques averaged a numerically higher AH‐N value than the DA but were not statistically different for 55 of the 56 observations. Therefore, these alternative soil sampling methods can be used successfully to collect soil samples for N‐STaR analysis on clayey soils.

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Soil Sample Collection and Handling: Technique Based on Source and Degree of Field Variability

Cited by 35 publications

References 18 publications

Validation of Soil‐Test‐Based Phosphorus and Potassium Fertilizer Recommendations for Irrigated Soybean

Validation of Soil‐Test‐Based Phosphorus and Potassium Fertilizer Recommendations for Irrigated Soybean

The impact of burial period on compact bone microstructure: Histological analysis of matrix loss and cell integrity in human bones exhumed from tropical soil

Comparison of soil sampling techniques for alkaline hydrolyzable‐nitrogen on clay soils

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