Spatial variability of the Illinois Soil Nitrogen Test: Implications for soil sampling

Matías L. Ruffo; German A Bollero; Donald G. Bullock

Spatial variability of the Illinois Soil Nitrogen Test: Implications for soil sampling

Matías L. Ruffo, German A Bollero, Donald G. Bullock

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The Illinois Soil Nitrogen Test (ISNT) is available for maize (Zea mays L.) nitrogen fertilization. However sampling recommendations have not been defined. On fourteen Illinois production fields, ISNT was normally distributed with an 18% coefficient of variation. Mean ISNT ranged from 98 mg kg^-1 to 255 mg kg^-1. At least ten samples are required to determine the mean ISNT for a given field with a precision of 24 mg kg^-1. ISNT has a strong spatial structure, as indicated by the bounded variograms, the relatively low nugget/sill ratio (less than 30% in ten fields) and mean range of 150 m.

Original language	English (US)
Title of host publication	Precision Agriculture 2005
Pages	751-757
Number of pages	7
State	Published - 2005
Event	5th European Conference on Precision Agriculture, ECPA 2005 - Uppsala, Sweden Duration: Jun 9 2005 → Jun 12 2005

Other

Other	5th European Conference on Precision Agriculture, ECPA 2005
Country	Sweden
City	Uppsala
Period	6/9/05 → 6/12/05

Keywords

Illinois Soil Nitrogen Test
Soil sampling
Variable rate nitrogen fertilization

ASJC Scopus subject areas

Agronomy and Crop Science

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title = "Spatial variability of the Illinois Soil Nitrogen Test: Implications for soil sampling",

abstract = "The Illinois Soil Nitrogen Test (ISNT) is available for maize (Zea mays L.) nitrogen fertilization. However sampling recommendations have not been defined. On fourteen Illinois production fields, ISNT was normally distributed with an 18% coefficient of variation. Mean ISNT ranged from 98 mg kg-1 to 255 mg kg-1. At least ten samples are required to determine the mean ISNT for a given field with a precision of 24 mg kg-1. ISNT has a strong spatial structure, as indicated by the bounded variograms, the relatively low nugget/sill ratio (less than 30% in ten fields) and mean range of 150 m.",

keywords = "Illinois Soil Nitrogen Test, Soil sampling, Variable rate nitrogen fertilization",

author = "Ruffo, {Mat{\'i}as L.} and Bollero, {German A} and Bullock, {Donald G.}",

year = "2005",

language = "English (US)",

isbn = "9789076998695",

pages = "751--757",

booktitle = "Precision Agriculture 2005",

note = "5th European Conference on Precision Agriculture, ECPA 2005 ; Conference date: 09-06-2005 Through 12-06-2005",

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T1 - Spatial variability of the Illinois Soil Nitrogen Test

T2 - 5th European Conference on Precision Agriculture, ECPA 2005

AU - Ruffo, Matías L.

AU - Bollero, German A

AU - Bullock, Donald G.

PY - 2005

Y1 - 2005

N2 - The Illinois Soil Nitrogen Test (ISNT) is available for maize (Zea mays L.) nitrogen fertilization. However sampling recommendations have not been defined. On fourteen Illinois production fields, ISNT was normally distributed with an 18% coefficient of variation. Mean ISNT ranged from 98 mg kg-1 to 255 mg kg-1. At least ten samples are required to determine the mean ISNT for a given field with a precision of 24 mg kg-1. ISNT has a strong spatial structure, as indicated by the bounded variograms, the relatively low nugget/sill ratio (less than 30% in ten fields) and mean range of 150 m.

AB - The Illinois Soil Nitrogen Test (ISNT) is available for maize (Zea mays L.) nitrogen fertilization. However sampling recommendations have not been defined. On fourteen Illinois production fields, ISNT was normally distributed with an 18% coefficient of variation. Mean ISNT ranged from 98 mg kg-1 to 255 mg kg-1. At least ten samples are required to determine the mean ISNT for a given field with a precision of 24 mg kg-1. ISNT has a strong spatial structure, as indicated by the bounded variograms, the relatively low nugget/sill ratio (less than 30% in ten fields) and mean range of 150 m.

KW - Illinois Soil Nitrogen Test

KW - Soil sampling

KW - Variable rate nitrogen fertilization

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BT - Precision Agriculture 2005

Y2 - 9 June 2005 through 12 June 2005

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