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Article

Combination of Inorganic Nitrogen and Organic Soil Amendment Improves Nitrogen Use Efficiency While Reducing Nitrogen Runoff

1
Department of Agriculture and Fisheries, Queensland Government, P.O. Box 102, Toowoomba, QLD 4350, Australia
2
School of Agriculture and Food Science, University of Queensland, St. Lucia, QLD 4072, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Jacynthe Dessureault-Rompré
Nitrogen 2022, 3(1), 58-73; https://doi.org/10.3390/nitrogen3010004
Received: 19 November 2021 / Revised: 10 January 2022 / Accepted: 18 January 2022 / Published: 20 January 2022
Improved nitrogen fertiliser management and increased nitrogen use efficiency (NUE) can be achieved by synchronising nitrogen (N) availability with plant uptake requirements. Organic materials in conjunction with inorganic fertilisers provide a strategy for supplying plant-available N over the growing season and reducing N loss. This study investigated whether a combined application of inorganic N with an organic soil amendment could improve nitrogen use efficiency by reducing N loss in runoff. Nitrogen runoff from a ryegrass (Lolium multiflorum) cover was investigated using a rainfall simulator. Nitrogen was applied at low, medium and high (50, 75 and 100 kg/ha) rates as either (NH4)2SO4 or in combination with a poultry manure-based organic material. We showed that the NUE in the combination (58–75%) was two-fold greater than in (NH4)2SO4 (24–42%). Furthermore, this combination also resulted in a two-fold lower N runoff compared with the inorganic fertiliser alone. This effect was attributed to the slower rate of N release from the organic amendment relative to the inorganic fertiliser. Here, we demonstrated that the combined use of inorganic and organic N substrates can reduce nutrient losses in surface runoff due to a better synchronisation of N availability with plant uptake requirements. View Full-Text
Keywords: rainfall simulator; nutrient runoff; ammonium; nitrate; nitrogen use efficiency rainfall simulator; nutrient runoff; ammonium; nitrate; nitrogen use efficiency
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MDPI and ACS Style

Phillips, I.; Paungfoo-Lonhienne, C.; Tahmasbian, I.; Hunter, B.; Smith, B.; Mayer, D.; Redding, M. Combination of Inorganic Nitrogen and Organic Soil Amendment Improves Nitrogen Use Efficiency While Reducing Nitrogen Runoff. Nitrogen 2022, 3, 58-73. https://doi.org/10.3390/nitrogen3010004

AMA Style

Phillips I, Paungfoo-Lonhienne C, Tahmasbian I, Hunter B, Smith B, Mayer D, Redding M. Combination of Inorganic Nitrogen and Organic Soil Amendment Improves Nitrogen Use Efficiency While Reducing Nitrogen Runoff. Nitrogen. 2022; 3(1):58-73. https://doi.org/10.3390/nitrogen3010004

Chicago/Turabian Style

Phillips, Ian, Chanyarat Paungfoo-Lonhienne, Iman Tahmasbian, Benjamin Hunter, Brianna Smith, David Mayer, and Matthew Redding. 2022. "Combination of Inorganic Nitrogen and Organic Soil Amendment Improves Nitrogen Use Efficiency While Reducing Nitrogen Runoff" Nitrogen 3, no. 1: 58-73. https://doi.org/10.3390/nitrogen3010004

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