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Crop, Forage and Turfgrass Management Abstract - Crop Management

Sensor-based Nitrogen Fertilization for Midseason Rice Production in Southeast Missouri

 

This article in CFTM

  1. Vol. 3 No. 1
    unlockOPEN ACCESS
     
    Received: Jan 19, 2017
    Accepted: May 08, 2017
    Published: August 17, 2017


    * Corresponding author(s): anserdj@ksu.edu
    afoste9@gmail.com
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doi:10.2134/cftm2017.01.0005
  1. Anserd Foster *a,
  2. Sam Atwellb and
  3. David Dunnc
  1. a Southwest Research-Extension Center, 4500 E. Mary, Garden City, KS 67846
    b Univ. of Missouri-Extension, New Madrid, MO 63869
    c Univ. of Missouri–Delta Center, P.O. Box 160, 147 State Hwy. T, Portageville, MO 63873
Core Ideas:
  • Sensor-based N management used with a nitrogen-rich strip was a very effective decision support tool for midseason N management.
  • Sensor-based N management provided opportunity to take advantage of year-to-year environmental variation.
  • Sensor-based N management approach reduced the amount of total N applied without any yield penalty compared with the traditional practice.

Abstract

Sensor-based nitrogen (N) decision management tools have shown potential to improve N fertilizer efficiency, yield, and profitability. Small-plot experiments were conducted to evaluate the use of sensor-based management in guiding midseason N application decisions. Treatments were two rice (Oryza sativa L.) cultivars (Jupiter, a medium grain, and Roy J, a long grain) and eight N treatments: (i) check (no N fertilizer); (ii) 60 lb N/acre applied preflood + midseason N applied based on sensor reading (sensor-based management); (iii) 90 lb N/acre applied preflood + midseason N applied based on sensor reading (sensor-based management); (iv) 120 lb N/acre applied preflood; (v) 120 lb N/acre applied preflood + 30 lb N/acre applied at midseason (traditional practice); (vi) 120 lb N/acre applied preflood + midseason N applied based on sensor reading (sensor-based management); (vii) 150 lb N/acre applied preflood; and (viii) 180 lb N/acre applied preflood (N reference strip). Grain yield and nitrogen use efficiency (NUE) were compared among N treatments. Results showed sensor-based management for midseason application recommended lower total N application rate by 15 to 90 lb N/acre over the traditional practice. These results indicate that N fertilization made by a sensor-based midseason recommendation can optimize yield and NUE in southeast Missouri.

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