Effects of controlled release fertilizers on N2O emission from paddy field

Abstract

Abstract: With close chamber method,this paper studied the effects of controlled release fertilizer (CRF),non-coated compound fertilizer (Com) and conventional urea (CK) on N₂O emission from paddy field. The results showed that within 10 days after transplanting,the ammonium and nitrate concentrations in the surface water of the plot treated with CRF were significantly different from those treated with Com. The partial coefficient between N₂O emission rates and corresponding nitrate concentrations in the water was significantly high (r=0.6834). Compared with Com,CRF was able to reduce N₂O emission from the paddy field. Within 100 days after basal application,the N₂O emission rate of treatment CRF was only 13.45%～21.26% of Com and 71.17%～112.47% of CK. The N₂O emission of Com was mainly concentrated in 1～25 d after basal fertilization and mid-aeration period,but that of CRF was remarkably lower during same period,while the peak of N₂O emission of CK was postponed and reduced. It was concluded that both one-time fertilization of CRF and several-time fertilizations of conventional urea were able to reduce N₂O emission from the paddy field.

Key words: N₂O emission, Controlled release fertilizer, Urea, Paddy field

CLC Number:

S145.3

LI Fangmin, FAN Xiaolin, LIU Fang, WANG Qiang . Effects of controlled release fertilizers on N₂O emission from paddy field[J]. Chinese Journal of Applied Ecology, 2004, (11): 2170-2174.

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Effects of controlled release fertilizers on N₂O emission from paddy field

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