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 proceedingConference 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 languageEnglish (US)
Title of host publicationPrecision Agriculture 2005
Pages751-757
Number of pages7
StatePublished - 2005
Event5th European Conference on Precision Agriculture, ECPA 2005 - Uppsala, Sweden
Duration: Jun 9 2005Jun 12 2005

Other

Other5th European Conference on Precision Agriculture, ECPA 2005
CountrySweden
CityUppsala
Period6/9/056/12/05

Keywords

  • Illinois Soil Nitrogen Test
  • Soil sampling
  • Variable rate nitrogen fertilization

ASJC Scopus subject areas

  • Agronomy and Crop Science

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