Impact of nitrification inhibitor with organic manure and urea on nitrogen dynamics and N2O emission in acid sulphate soil

Shordar Mohamed Shamsuzzaman,Masuda Begum,Soud Mohd Halimi,Abd Wahid Samsuri,Jantan Nur Maisarah,Mohamed Musa Hanafi Hanafi

doi:10.1590/1678-4499.156

Shordar Mohamed Shamsuzzaman, Masuda Begum + Show 4 more

Open Access

https://doi.org/10.1590/1678-4499.156

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Journal: Bragantia	Publication Date: Nov 27, 2015
Citations: 10	License type: cc-by

Affiliation: Universiti Putra Malaysia, Malaysian Palm Oil Board

Abstract

The accurate prediction of N transformation is an important requisite for optimizing N use efficiency in cropping systems. An incubation study was conducted to verify the impacts of nitrification inhibitor (NI) with organic manure (OM) and urea on N dynamics and N2O emission in acid sulphate soil. The conducted experiment was two-level factorial with 4 N sources (N1 = 100% of N from urea, N2 = 75% of N from urea + 25% N from rice straw, N3 = 75% of N from urea + 25% of N from cow dung and N4 = 75% of N from urea + 25% of N from poultry dung) and two levels of NI (with and without DCD). The NI (Dicyandiamide - DCD) with OM + urea enhanced mineral N contents and it was the highest (255.07 µg∙g-1) for urea with DCD applications. The highest net N-mineralization (213.07 µg∙g-1) was recorded for the application of urea with DCD and net nitrification (16.26 µg∙g-1) was recorded for the application of urea alone, but the highest cumulative N2O emission (5.46 µg∙g-1) was in urea + poultry dung (PD). In addition, DCD most effectively inhibited net nitrification (28.78%) and N2O emission (32.40%) from cow dung (CD) and urea in the tested soils. The combination of DCD with CD and urea was more effective in reducing N2O emissions (43.69%). These results suggest that the DCD with CD and urea may be the most potential combination to reduce nitrification and N2O emission as well as N loss from acid sulphate soil.

Highlights

The available N content of soils is produced through N-mineralization, which governs the supply rate of N to plants
These results suggest that the DCD with cow dung (CD) and urea may be the most potential combination to reduce nitrification and N2O emission as well as N loss from acid sulphate soil
The concentration of NH4+ increased soon after application of urine compared to the control treatment, because the majority of urine–N consists of urea (80%) and mineralizable amino acids which undergo quick hydrolysis and ammonification to produce NH4+ (Zaman et al 2009)

Summary

Introduction

The available N content of soils is produced through N-mineralization, which governs the supply rate of N to plants. Fertilizer N management practices have a cumulative effect on N cycling and availability over time. Mineralized N or NH4+ released under anaerobic incubation are significantly correlated with soil organic matter; both quality and quantity of organic matter clearly affect N-mineralization in wetland rice soils (Sahrawat 2006). The greater part of N in paddy soil exists in soil organic matter. This tends to be conserved more in paddy soils than in upland soils, because of the anaerobic conditions. Microbial decomposition of the organic matter gradually releases ammonium N (NH4+–N)

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