Spatial variability of the Illinois soil nitrogen test: Implications for soil sampling

Matías L. Ruffo, Germán A. Bollero, Donald Bullock

Research output: Chapter in Book/Report/Conference proceedingChapter

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 '05
PublisherBrill
Pages751-757
Number of pages7
ISBN (Electronic)9789086865499
ISBN (Print)9789076998695
DOIs
StatePublished - Jan 1 2023

Keywords

  • Illinois Soil Nitrogen Test
  • soil sampling
  • variable rate nitrogen fertilization

ASJC Scopus subject areas

  • General Engineering
  • General Agricultural and Biological Sciences
  • General Social Sciences

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