Impact of Different Levels of Nitrogen Fertilizer on N2O Emission from Different Soils

JIAO Yan , HUANG Yao , ZONG Liang-gang , ZHOU Quan-suo , Ronald L.Sass


Received ,Revised September 18, 2007, Accepted , Available online

Volume 4,1992,Pages 2094-2098

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To investigate the effect of different urea incorporation amount in different soils on N2O emission, a pot experiment was carried in 2002-2003.Four treatments were designed as the control (without urea incorporation); low N fertilizer level(334 kg/hm2); middle N fertilizer level(670 kg/hm2); high N fertilizer level (1 004 kg/hm2). In rice growing season, compared to control, the increment of N2O emission accumulation flux of each soil has no obviously differences among three N fertilizer levels. Contrarily, in wheat-planted soils, there are remarkably differences among three N fertilizer levels. Without urea incorporation, there are no differences among N2O accumulation emission flux of three soils. During the rice growing season, N2O accumulation emission flux of F soil (jiangsu province, lishui), G soil (jiangsu province, lianshui) and H soil (jiangsu province, agriculture academy) are 168, 127 and 146 mg/m2,respectively. N2O accumulation emission flux of F soil, G soil and H soil is 134, 124 and 168 mg/m2, respectively, during wheat growing season. Incorporation of urea into different soils yielded different influence on N2O emission. For example, at middle-N fertilizer, N2O accumulation emission flux from F soil, G soil and H soil is 976, 744 and 626 mg/m2,respectively. During rice-wheat rotation period, significance differences exists among N2O emission factors of three soils, with the value of (1.1±0.23)%, (0.75±0.17%) and (1.01±0.11)%. Furthermore, under the high N fertilizer level, N2O emission factors of three soils had no significantly difference(p=0.3); while, the N2O emission factors existed difference among three soils under the low and middle N fertilizer level(F=6.25,p=0.01).

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