Comparison of different methods for the measurement of ammonia volatilization after urea application in Henan Province, China
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Comparison of different methods for the measurement of ammonia volatilization after urea application in Henan Province, China. / Pacholski, Andreas; Cai, Gui-Xin; Fan, Xiao-Hui et al.
in: Journal of Plant Nutrition and Soil Science, Jahrgang 171, Nr. 3, 01.06.2008, S. 361-369.Publikation: Beiträge in Zeitschriften › Zeitschriftenaufsätze › Forschung › begutachtet
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TY - JOUR
T1 - Comparison of different methods for the measurement of ammonia volatilization after urea application in Henan Province, China
AU - Pacholski, Andreas
AU - Cai, Gui-Xin
AU - Fan, Xiao-Hui
AU - Ding, Hong
AU - Chen, Deli
AU - Nieder, Rolf
AU - Roelcke, Marco
PY - 2008/6/1
Y1 - 2008/6/1
N2 - Ammonia losses following urea fertilization of maize and winter wheat were determined in field trials carried out at Fengqiu Experimental Station in the North China Plain in 1998 and 1999. Four experiments were carried out using two simplified micrometeorological integrated horizontal flux methods [IHF(L) and IHF(S)], a chamber method (calibrated Dräger-Tube Method DTM) and the 15N-balance method using 15N-labeled urea. The IHF(L) was taken as the reference method. Both IHF methods showed good agreement in one experiment only, while the IHF(S) overestimated as well as underestimated cumulative ammonia losses compared to IHF(L) in the other experiments (deviation ranged from 12.5% to 64% based on cumulative ammonia losses). Regression analysis of the fluxes showed that in particular different sensitivities of the samplers to wind speed accounted for the discrepancies observed. The IHF(L) and the DTM flux curves were very similar in three experiments, while the values obtained with DTM considerably deviated from IHF(L) results in one experiment. A comparison with apparent fertilizer-N losses determined by the 15N-labeling approach showed that ammonia volatilization was the major pathway of fertilizer-N loss in this study.
AB - Ammonia losses following urea fertilization of maize and winter wheat were determined in field trials carried out at Fengqiu Experimental Station in the North China Plain in 1998 and 1999. Four experiments were carried out using two simplified micrometeorological integrated horizontal flux methods [IHF(L) and IHF(S)], a chamber method (calibrated Dräger-Tube Method DTM) and the 15N-balance method using 15N-labeled urea. The IHF(L) was taken as the reference method. Both IHF methods showed good agreement in one experiment only, while the IHF(S) overestimated as well as underestimated cumulative ammonia losses compared to IHF(L) in the other experiments (deviation ranged from 12.5% to 64% based on cumulative ammonia losses). Regression analysis of the fluxes showed that in particular different sensitivities of the samplers to wind speed accounted for the discrepancies observed. The IHF(L) and the DTM flux curves were very similar in three experiments, while the values obtained with DTM considerably deviated from IHF(L) results in one experiment. A comparison with apparent fertilizer-N losses determined by the 15N-labeling approach showed that ammonia volatilization was the major pathway of fertilizer-N loss in this study.
KW - Chemistry
KW - N
KW - Ammonia loss
KW - Dräger-tube method
KW - Integrated horizontal flux method
UR - http://www.scopus.com/inward/record.url?scp=54549108755&partnerID=8YFLogxK
U2 - 10.1002/jpln.200625195
DO - 10.1002/jpln.200625195
M3 - Journal articles
AN - SCOPUS:54549108755
VL - 171
SP - 361
EP - 369
JO - Journal of Plant Nutrition and Soil Science
JF - Journal of Plant Nutrition and Soil Science
SN - 1436-8730
IS - 3
ER -