Effect of Rice Cultivars and Fertilizer Management on Methane Emission

Effect of Rice Cultivars and Fertilizer Management on Methane Emission

SHAO Kesheng
(Center of Environmental Sciences of Peking University, State Key Laboratory
of Environmental Simulation and Pollution Control, Beijing, 100871)
LI Zhen
(Crop Breeding and Cultivation Institute, Chinese Academy of
Agricultural Sciences, Beijing, 100083)

Abstract:
Experiments were conducted during April-Oct. 1994 in Beijing rice field. Large cultivar differences in methane emission flax have been found. Variety 93812 emitted about fivefold more CH4 per meter square per hour than did the variety Qiuguang. Organic amendment plus (NH4)2SO4 as the mixed base fertilizer and (NH4)2SO4 as the topdressing applied in different amounts and stages compared with the mixed base fertilizer only could reduce methane emission about 58% and increase rice yield about 31.7%. Emission Peaks of CH4 in the tillering stage and reproductive stage could be obviously suppressed.
Key words:
Methane emission flux; rice cultivars; intracellular air spaces (aerenchyma); tillering fertilizer; panicle fertilizer
(R.D.1996-01-08 P.D. 1996-07-20 Vol.32 No.4 pp.505-513)


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