Effects of a urease inhibitor and aluminium chloride alone or combined with a nitrification inhibitor on gaseous N emissions following soil application of cattle urine

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• 作者：Jos¨¦ Pereira ; Arlete S. Barneze ; Tom H. Misselbrook ; Jo?o Coutinho ; Nuno Moreira ; Henrique Trindade
• 刊名：Biosystems Engineering
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：115
• 期：4
• 页码：396-407
• 全文大小：604 K

文摘

Addition to soil of separated cattle-urine obtained from housing with urine-faeces segregation systems is an important source of gaseous nitrogen (N) emissions. This study aimed to evaluate the effect of adding different concentrations of the urease inhibitor N-(n-butyl) thiophosphoric triamide (NBPT) and aluminium chloride (AlCl₃), alone or combined with the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP), on gaseous N losses and N transformations in soil amended with cattle-urine.

Using laboratory incubations soil was amended with cattle-urine (200?kg total N?ha^?1) containing NBPT (0.1 or 1.0 % ) or AlCl₃ (0.5 or 1.0 % ) either as a single additive or combined with 0.5 % DMPP. Three additional treatments were included: soil only (Control), soil amended only with cattle-urine and soil amended with cattle-urine and DMPP.

The addition of NBPT at 1 % significantly delayed urea hydrolysis during the first 4-d after urine application comparatively to treatments receiving AlCl₃. Nitrification was inhibited by addition of DMPP, with no further effect (P?>?0.05) when DMPP was combined with NBPT or AlCl₃. The AlCl₃ treatment had no effect on urea hydrolysis or nitrification. The combination of DMPP with NBPT or AlCl₃ increased (P?<?0.05) NH₃ emissions and reduced (P?<?0.05) NO and N₂O emissions compared with urine alone. It was concluded that NBPT was more effective at reducing gaseous N emissions from cattle-urine applications than AlCl₃, and that NBPT alone was more effective than NBPT combined with DMPP. No advantages were gained from the combination of one of these additives with DMPP on total gaseous N emissions.