Greenhouse gas emissions and plant characteristics from soil cultivated with sunflower (Helianthus annuus L.) and amended with organic or inorganic fertilizers

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• 作者：F. Ló ; pez-Valdez^a ; ^c ; ^{flopez2072@yahoo.com} ; F. Ferná ; ndez-Luqueñ ; o^b ; ^c ; S. Luna-Suá ; rez^a ; L. Dendooven^c
• 关键词：Wastewater sludge ; Urea ; Soil characteristics ; Plant characteristics ; Inorganic nitrogen ; Yield
• 刊名：Science of the Total Environment
• 出版年：2012
• 出版时间：1 March 2012
• 年：2012
• 卷：412-413
• 期：Complete
• 页码：257-264
• 全文大小：394 K

文摘

Agricultural application of wastewater sludge has become the most widespread method of disposal, but the environmental effects on soil, air, and crops must be considered. The effect of wastewater sludge or urea on sunflower's (Helianthus annuus L.) growth and yield, the soil properties, and the resulting COb>2b> and Nb>2b>O emissions are still unknown. The objectives of this study were to investigate: i) the effect on soil properties of organic or inorganic fertilizer added to agricultural soil cultivated with sunflower, ii) how urea or wastewater sludge increases COb>2b> and Nb>2b>O emissions from agricultural soil over short time periods, and iii) the effect on plant characteristics and yield of urea or wastewater sludge added to agricultural soil cultivated with sunflower. The sunflower was fertilized with wastewater sludge or urea or grown in unamended soil under greenhouse conditions while plant and soil characteristics, yield, and greenhouse gas emissions were monitored. Sludge and urea modified some soil characteristics at the onset of the experiment and during the first two months but not thereafter. Some plant characteristics were improved by sludge. Urea and sludge treatments increased the yield at similar rates, while sludge-amended soil significantly increased Nb>2b>O emissions but not COb>2b> emissions compared to the other amended or unamended soils. This implies that wastewater sludge increased the biomass and/or the yield; however, from a holistic point of view, using wastewater sludge as fertilizer should be viewed with concern.