Campus Units

Agronomy

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

5-24-2020

Journal or Book Title

Soil Science Society of America Journal

DOI

10.1002/saj2.20099

Abstract

Fall applied liquid swine (Sus scrofa domesticus) manure (LSM) can lead to economic and environmental concerns due to potentially enhanced NO3 loss. Objectives of this study were to evaluate LSM application timing and use of Instinct nitrification inhibitor, and compare to anhydrous ammonia (AA). Treatments were a no-N control, AA (without Instinct), and LSM with three Instinct rates applied each of 3 yr on October 1 (early fall) and November 1 (late fall). The effect of Instinct was inconsistent. Instinct increased soil NH4–N concentrations in fall (only early fall LSM application) and spring sampled LSM injection zones. However, in the late spring Instinct had no effect to minimal positive effect on soil inorganic–N, and the high rate was not more effective than the low rate. Corn (Zea mays L.) canopy normalized difference vegetative index (NDVI) was not influenced by Instinct or different between N source, and greatest with late fall N application. Across years, Instinct increased corn grain yield only when early fall applied with the low rate. However, LSM with Instinct had lower yield compared to AA. Waiting to apply N in late fall provided increased inorganic N retention, and with LSM higher corn yield. Based on this study, AA was a better fall applied N source compared to LSM with or without Instinct. A decision to use Instinct with LSM must weigh cost of the inhibitor against other options, such as delayed fall or spring application, or use of AA.

Comments

This is a manuscript of an article published as Sassman, Aaron M., Daniel W. Barker, John P. Lundvall, and John E. Sawyer. "Evaluation of fall applied liquid swine manure with encapsulated nitrapyrin." Soil Science Society of America Journal (2020). doi: 10.1002/saj2.20099. Posted with permission.

Copyright Owner

The Authors. Soil Science Society of America Journal, Soil Science Society of America

Language

en

File Format

application/pdf

Available for download on Monday, May 24, 2021

Published Version

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