Developing nitrogen fertilizer recommendations for corn using an active sensor

Adam E. Dellinger, John P. Schmidt, Douglas Brian Beegle

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Producers often overapply N fertilizer to corn (Zea mays L.) because of the uncertainty in predicting the economic optimum nitrogen rate (EONR). Remote sensing represents a potential opportunity to reduce this uncertainty with an in-season assessment of crop N status. This study examines the relationship between EONR and reflectance from a ground-based sensor, and considers its potential for developing sidedress N recommendations for corn. Four fields with unique cropping histories were planted to corn during each of 2 yr. Three preplant whole plot treatments (control, 56 kg N ha-1 as NH 4NO3, and manure) were used to create a range of N availability. Split plot treatments included seven sidedress rates (0, 22, 45, 90, 135, 180, and 280 kg N ha-1) and one preplant rate (280 kg N ha-1) as NH4NO3. The EONR for the sidedress N rates was determined for each whole plot treatment at each site. A ground-based active sensor was used at the sixth- to seventh-leaf growth stage (V6-V7) to collect reflectance data at 590 and 880 nm, which were then used to calculate the Green Normalized Difference Vegetation Index (GNDVI). The EONRs for sidedress N application for the 24 preplant treatment-site combinations ranged from 0 to 202 kg N ha-1. The EONR was strongly related to relative GNDVI (r2 = 0.84) for the control and manure preplant treatments; but unrelated when NH4NO3 was applied at planting (r 2 = 0.20). Developing sidedress N recommendations for corn using an active sensor could be an effective N management tool in Pennsylvania.

Original languageEnglish (US)
Pages (from-to)1546-1552
Number of pages7
JournalAgronomy Journal
Volume100
Issue number6
DOIs
StatePublished - Nov 1 2008

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nitrogen fertilizers
economics
corn
nitrogen
reflectance
uncertainty
cropping sequence
remote sensing
Zea mays
developmental stages
planting
crops
leaves
normalized difference vegetation index

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science

Cite this

Dellinger, Adam E. ; Schmidt, John P. ; Beegle, Douglas Brian. / Developing nitrogen fertilizer recommendations for corn using an active sensor. In: Agronomy Journal. 2008 ; Vol. 100, No. 6. pp. 1546-1552.
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Developing nitrogen fertilizer recommendations for corn using an active sensor. / Dellinger, Adam E.; Schmidt, John P.; Beegle, Douglas Brian.

In: Agronomy Journal, Vol. 100, No. 6, 01.11.2008, p. 1546-1552.

Research output: Contribution to journalArticle

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