Combining Urea with Chemical and Biological Amendments Differentially Influences Nitrogen Dynamics in Soil and Wheat Growth

Abstract

Nitrogen (N) losses from fertilized fields pose a major concern in modern agriculture due to environmental implications. Urease inhibitors, such as N-(n-butyl) thiophosphoric triamide (NBPT), nitrification inhibitors (NI), like dicyandiamide (DCD), and sulfur-oxidizing bacteria (SOB) could have potential in reducing N losses. For evaluating their effectiveness, investigations were undertaken through incubation and greenhouse experiments by mixing a urea fertilizer with sole NBPT, DCD, and SOB, as well as combined, on ammonia volatilization losses from silt loam soil. An incubation experiment was conducted in 1 L airtight plastic jars with adequate aeration and constant temperature at 25 degrees C for 10 days. Three replications of each treatment were conducted using a completely randomized designed. The ammonia emission rate gradually increased until the highest (17.21 mg NH3 m(-2) h(-1)) value on the third day with sole urea and some other treatments except NBPT alone, which prolonged the hydrolysis peak until the fifth day with the lowest ammonia emission rate (12.1 mg NH3 m(-2) h(-1)). Although the DCD and SOB treatments reduced ammonia emission, their difference with urea was nonsignificant. Additionally, mixing NBPT with urea exhibited the highest population of nitrifying bacteria in soil, indicating its potential role in promoting the nitrification process. In a greenhouse experiment, 10 treatments, i.e., T-1 = control, T-2 = N-120 (urea fertilizer equivalent to 120 kg N ha(-1)), T-3 = N-90 (90 kg N ha(-1)), T-4 = N-90 + NBPT, T-5 = N-90 + DCD, T-6 = N-90 + SOB, T-7 = N-90 + NBPT + DCD, T-8 = N-90 + NBPT + SOB, T-9 = N-90 + DCD + SOB, and T-10 = N-90 + NBPT + DCD + SOB, were applied to investigate the wheat yield and N uptake efficiency. The highest N recovery efficiency (31.51%) was recorded in T-5 where DCD was combined with urea at 90 kg ha(-1).

Published in

ACS Omega
2024, volume: 9, number: 30, pages: 32617-32627

SLU Authors

• Yong, Jean W.H

  • Department of Biosystems and Technology, Swedish University of Agricultural Sciences
    

Global goals (SDG)

SDG2 Zero hunger
SDG12 Responsible consumption and production
SDG15 Life on land

UKÄ Subject classification

Microbiology
Agricultural Science
Soil Science

Publication identifier

• DOI: https://doi.org/10.1021/acsomega.4c01451

Permanent link to this page (URI)

https://res.slu.se/id/publ/131258