Effect of rates and sources of nitrogen on rice yield, nitrogen efficiency, and methane emission from irrigated rice cultivation

Issue Date

11-2016

Abstract

The agronomic benefits of manure application to increase rice production have been recognized, but the impact on global change has always been a controversial topic. This study was designed to determine the separate and combined effects of cattle manure (CM) and nitrogen (N) fertilizer on rice yield, N efficiency, and methane (CH 4 ) emissions from rice cultivation. A pot-scale experiment was conducted with four levels (0, 60, 120, and 180 kg ha −1 ) of N from urea and two levels (120 and 180 kg ha −1 ) of N from combination of urea and CM (Urea:CM = 60:60 and 60:120). Rice yield and physiological N efficiency were obtained using agronomic measurements. To determine the global warming potential (GWP) of each treatment, CH 4 emissions were measured throughout the rice-growing period. Grain yield (GY) was not significantly different between the treatments of 120 and 180 kg ha −1 regardless of N source. However, both rates of CM treatments enhanced CH 4 emission and differences in GWP were significant. In conclusion, urea applied at 120 kg N ha −1 was optimal for rice productivity and environmental impact (EI) despite CM played a crucial role in improving the N efficiency and total N in the soil after harvest.

Source or Periodical Title

Archives of Agronomy and Soil Science

ISSN

0365-0340

Volume

63

Issue

7

Page

1009-1022

Document Type

Article

Language

English

Subject

Global warming potential (GWP); Greenhouse gases; Irrigated rice; N efficiency; Organic fertilization

Identifier

https://doi.org/10.1080/03650340.2016.1255327

Digital Copy

yes

En – AGROVOC descriptors

Global warming potential (GWP); Greenhouse gases; Irrigated rice; N efficiency; Organic fertilization

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