Ji Yang, Zhang Xiao-Yan, Ma Jing, Li Xiao-ping, Xu Hua, Cai Zu-cong
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Ying Yong Sheng Tai Xue Bao. 2011 Aug;22(8):2031-7.
By the method of static chamber, a field experiment was conducted to study the effects of applying controlled-release fertilizer (CRF) and its combination with urea on the N2O emission during rice growth period. Four treatments, i.e., no fertilization (CK), urea (U), urea and CRF with a ratio of 3:7 (U+C), and CRF (C) were installed, and the N application rate in treatments U, U+C, and C was the same. Compared with treatment U, treatments U+C and C decreased the N2O emission during rice growth season by 40.4% and 59.6%, and decreased the emission at midseason aeration stage by 65.1% and 83.9%, respectively (P < 0.05). Compared with that in treatment C, the N2O emission in treatment U+C had a slight decrease, and decreased by 53.9% at midseason aeration stage. Applying CRF increased rice yield, and the increment in treatments C and U+C was 7.8% and 9.8%, respectively, as compared to treatment U. Applying CRF delayed the peak time of soil inorganic nitrogen concentration, resulting in the reduction of N2O emission at midseason aeration stage. During rice growth season, no significant correlation was observed between N2O flux and soil Eh or soil temperature.
采用静态箱法进行田间试验，研究施用控释肥（CRF）及其与尿素配施对水稻生育期N2O排放的影响。设置了4个处理，即不施肥（CK）、尿素（U）、尿素与控释肥比例为3∶7的配施处理（U+C）和控释肥（C），其中处理U、U+C和C的施氮量相同。与处理U相比，处理U+C和C在水稻生长季的N2O排放量分别降低了40.4%和59.6%，在晒田期分别降低了65.1%和83.9%（P<0.05）。与处理C相比，处理U+C的N2O排放量略有降低，在晒田期降低了53.9%。施用控释肥提高了水稻产量，与处理U相比，处理C和U+C的增幅分别为7.8%和9.8%。施用控释肥使土壤无机氮浓度峰值时间推迟，导致晒田期N2O排放量降低。在水稻生长季，N2O通量与土壤氧化还原电位或土壤温度之间未观察到显著相关性。
