Haijun Sun, Hailin Zhang, D. Powlson
Mar 1, 2015
Citations
3
Influential Citations
105
Citations
Quality indicators
Journal
Field Crops Research
Abstract
Abstract The effectiveness of nitrification inhibitor use in rice paddy fields is variable. In this regard, the impact of 2-chloro-6-(trichloromethyl)-pyridine (CP) nitrification inhibitor on rice yields and nitrogen (N) losses via nitrous oxide (N 2 O) emission and ammonia (NH 3 ) volatilization from rice paddy fields was studied using five treatments: CK (no N applied), N180 and N240 (180 kg N ha −1 and 240 kg N ha −1 applied) and their counterparts N180 + CP and N240 + CP (N use plus CP). The field experiment was conducted in a major rice cultivation region of China in 2012 and 2013. The results showed that N180 + CP increased rice yield by 10% in 2012 and 17% in 2013 compared with N180, and reached the same yield as N240. The N 2 O losses were 0.88% of N applied in 2012 and 0.38% in 2013 for N180, while they were reduced to 0.44% and 0.19% for N180 + CP in the two years, respectively. For N240, CP decreased N 2 O losses from 0.78% to 0.71% in 2012 and from 0.38% to 0.22% in 2013. However, NH 3 volatilization was increased by CP from 7.6% of applied N in N180 to 10.2% in N180 + CP in 2012 and from 8.5% to 13.0% in 2013. The NH 3 volatilization for N240 was increased by CP from 14.3% to 24.3% in 2012 and from 26.6% to 35.3% in 2013. Our results suggested that the decrease in N application was permitted by the use of CP since the same yield with 180 kg N ha −1 with CP was obtained as with 240 kg N ha −1 in the absence of CP and decreased direct emission of N 2 O. Despite the increase in NH 3 volatilization with CP, and the consequent increase in indirect N 2 O emissions, we calculated that CP led to an overall decrease in global warming potential.