Drainage Water Quality Impacts of Agricultural Management Practices: Effect of Manure Application Timing and Cover Crops

Dougherty, Brian; Pederson, Carl H.; Soupir, Michelle L.; Andersen, Dan S.

doi:10.31274/farmprogressreports-180814-1989

Cited by 1 publication

(5 citation statements)

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“…Positive corn yield responses from Instinct were also found by Dougherty et al. (2018) when LSM was late fall applied in years with above normal and normal growing season precipitation. Instinct is a new nitrification inhibitor formulated product, and therefore additional research on corn response to Instinct with LSM would be beneficial for corn producers.…”

Section: Introductionsupporting

confidence: 65%

“…(1984) found that adding nitrapyrin (at a rate much higher than recommended) to fall applied LSM improved corn yields by an average of 46%. A recent study in Iowa found higher continuous corn yields when Instinct was included with a late fall LSM application (Dougherty et al., 2018). Vetsch et al.…”

Section: Resultsmentioning

confidence: 99%

“…Vetsch, Scherder, and Ruen (2017) found a positive corn yield response to Instinct in 3 of 4 yr in Minnesota when fall applied with LSM, having a greater yield benefit when LSM was applied in early fall compared to the late fall. Positive corn yield responses from Instinct were also found by Dougherty et al (2018) when LSM was late fall applied in years with above normal and normal growing season precipitation. Instinct is a new nitrification inhibitor formulated product, and therefore additional research on corn response to Instinct with LSM would be beneficial for corn producers.…”

Section: Core Ideasmentioning

confidence: 90%

“…McCormick et al (1984) found that adding nitrapyrin (at a rate much higher than recommended) to fall applied LSM improved corn yields by an average of 46%. A recent study in Iowa found higher continuous corn yields when Instinct was included with a late fall LSM application (Dougherty et al, 2018). Vetsch et al (2017) found LSM applied with Instinct had higher yields in 3 of 4 yr and across years compared to LSM without Instinct (averaged across LSM application time).…”

Section: Instinct Rate With Liquid Swine Manurementioning

confidence: 98%

“…This can lead to increased potential losses of N through leaching or denitrification. Sabey, Bartholomew, Shaw, and Pesek (1956) reported delaying NH 4 -N application until soil temperatures are 10 • C (and cooling) as being advantageous because the microbial oxidation rate of NH 4 is limited with cold temperatures, and stops near 0 • C. Along with crop yield concerns, fall applied LSM can create water quality issues related to NO 3 loss to ground and surface waters, and potentially more loss than with fall or spring applied fertilizer N (Bakhsh, Kanwar, & Karlen, 2005;Dougherty, Pederson, Soupir, & Andersen, 2018;Lawlor, Helmers, Baker, Melvin, & Lemke, 2011).…”

mentioning

confidence: 99%

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Evaluation of fall applied liquid swine manure with encapsulated nitrapyrin

Sassman¹,

Barker²,

Lundvall

et al. 2020

Soil Science Soc of Amer J

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Fall applied liquid swine (Sus scrofa domesticus) manure (LSM) can lead to economic and environmental concerns due to potentially enhanced NO 3 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 NH 4-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. 1 INTRODUCTION Iowa leads the USA in swine production with more than 6000 swine operations and over 40 million head marketed annually (NASS, 2019). That production level has resulted in areas within the state where large quantities of nutrients from swine manure are available for use in crop production. Research conducted by Risse et al. (2001) found LSM

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Section: Introductionsupporting

confidence: 65%

Section: Resultsmentioning

confidence: 99%