Fate of applied urea 15N in a soil-maize system as affected by urease inhibitor and nitrification inhibitor

L. Zhang, Z. Wu, Y. Jiang, L. Chen, Y. Song, L. Wang, J. Xie and X. Ma
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L. Zhang: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, P.R. China
Z. Wu: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, P.R. China
Y. Jiang: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, P.R. China
L. Chen: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, P.R. China
Y. Song: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, P.R. China
L. Wang: Agricultural Environment and Resources Research Center, Jilin Academy of Agricultural Sciences, Changchun, P.R. China
J. Xie: Agricultural Environment and Resources Research Center, Jilin Academy of Agricultural Sciences, Changchun, P.R. China
X. Ma: Institute of Heilongjiang Academy of Agricultural Sciences, Harbin, P.R. China

Plant, Soil and Environment, 2010, vol. 56, issue 1, 8-15

Abstract: A micro-plot field experiment with reduced urea 15N application was conducted to study the effects of urease inhibitor NBPT (N-(n-butyl) thiophosphoric triamide) and nitrification inhibitor DMPP(3,4-dimethyl-1H-pyrazolium dihydrogen) on the fate of applied urea 15N; it aimed to find an efficient way to reduce the urea N application rate while improving the agronomic and environmental benefits. Five treatments were installed, i.e., 180 kg N/ha (N1, conventional application rate), 126 kg N/ha (N2, reduced to 70% conventional application rate), N2 + NBPT, N2 + DMPP, and N2 + NBPT + DMPP. Compared with treatment N1, all the other treatments had a significantly higher total 15N recovery by both soil and plant (P < 0.05 48.20, 41.39, 37.69, 38.85 and 34.83% soil recovery for N2 + NBPT + DMPP, N2 + DMPP, N2 + NBPT, N2 and N1treatment, respectively; and 42.68, 40.86, 40.25, 37.18 and 36.30% plant recovery for N2 + NBPT + DMPP, N2 + DMPP, N2 + NBPT, N2, and N1 treatment, respectively). In the plant 15N recovery, the 15N absorbed in grain/stem was highest in treatment N2 + NBPT + DMPP. The maize biomass and the maize yield had a slight increase in treatment N2 + NBPT + DMPP, compared with those in treatment N1. In sum, for the maize production in study area, N2 + NBPT + DMPP application method would be a feasible way to ensure the normal maize yield while improving yield quality, saving urea fertilizer, and protecting the environment.

Keywords: nitrogen; fertilizer; N losses; N use efficiency (search for similar items in EconPapers)
Date: 2010
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DOI: 10.17221/129/2009-PSE

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