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RESEARCH ARTICLE

Polymer-coated urea applied at one-time mechanical topdressing increases nitrogen use efficiency and rice yield in the cold area

Cailian Yu https://orcid.org/0000-0002-6667-7650 A * , Yuchen Lin https://orcid.org/0009-0002-3768-965X A , Bolin Li A , Xiaolun Liu B , Zhilei Liu B and Xianlong Peng https://orcid.org/0000-0001-6882-5533 B *
+ Author Affiliations
- Author Affiliations

A The School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China.

B Resource and Environment College, Northeast Agricultural University, Harbin 150030, China.


Handling Editor: Irshad Bibi

Soil Research 62, SR23192 https://doi.org/10.1071/SR23192
Submitted: 25 September 2023  Accepted: 3 April 2024  Published: 23 April 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

The application of slow and controlled release fertilisers can reduce nitrogen loss, but the research is still scarce in the cold rice region of China.

Aims

The study was conducted to screen slow-release or controlled-release fertilisers which can meet the nitrogen demand of rice and reduce NH3 volatilisation in different pH soils.

Methods

This experiment includes four fertilisation treatments: no fertiliser (control), urea, urea with N-(n-butyl) thiophosphorictriamide (NBPT), and polymer-coated urea (PCU). The amounts of urea-N, pH, ammonium-N (NH4+-N) in the surface water, and NH3 volatilisation were determined. Thereafter, to evaluate the effects of one-time mechanical topdressing of PCU mixed with compound fertilisers along with farmers’ fertilisation practice (FFP), field experiments carried out in wide soil pH differences were conducted.

Key results

Cumulative NH3 volatilisation was reduced in the NBPT treatment compared with the urea treatment. There was no significant difference between urea-N, NH4+-N, and pH in the surface water under PCU and control. NH3 volatilisation of PCU is negligible and significantly prolongs the soil nitrogen storage time. In the subsequent experiment, PCU blend increased yield, dry matter, nitrogen uptake, and the partial factor productivity of applied nitrogen (PFPN) compared to FFP.

Conclusions

PCU treatment slows down urea release and reduces ammonia volatilisation from paddy fields. In turn, it reduces ammonia-nitrogen levels and pH in surface water and further slows down the rate of ammonia volatilisation.

Implications

Application of PCU as a one-time mechanical topdressing fertiliser in rice fields in cold regions saves nitrogen fertiliser, increases crop yields, and reduces labour.

Keywords: ammonia volatilisation, cold area, N-(n-butyl) thiophosphorictriamide, nitrogen use efficiency, one-time mechanical topdressing, polymer-coated urea, rice yield, urea.

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