Evaluation of 3,4-dimethylpyrazole phosphate as a nitrification inhibitor in a <Emphasis Type="Italic">Citrus</Emphasis>-cultivated soil |
| |
Authors: | M D Serna J Bañuls A Quiñones E Primo-Millo F Legaz |
| |
Institution: | (1) Instituto Valenciano de Investigaciones Agrarias, Departamento de Citricultura y otros Frutales, Apdo. Oficial 46113 Moncada, Valencia, Spain e-mail: flegaz@ivia.es Fax: +34-96-1390240, ES |
| |
Abstract: | The objectives of this work were to evaluate the inhibitory action on nitrification of 3,4-dimethylpyrazole phosphate (DMPP)
added to ammonium sulphate nitrate (NH4)2SO4 plus NH4NO3; ASN] in a Citrus-cultivated soil, and to study its effect on N uptake. In a greenhouse experiment, 2 g N as ASN either with or without 0.015 g
DMPP (1% DMPP relative to NH4
+-N) was applied 6 times at 20-day intervals to plants grown in 14-l pots filled with soil. Addition of DMPP to ASN resulted
in higher levels of NH4
+-N and lower levels of NO3
–-N in the soil during the whole experimental period. The NO3
–-N concentration in drainage water was lower in the ASN plus DMPP (ASN+DMPP)-treated pots. Also, DMPP supplementation resulted
in greater uptake of the fertilizer-N by citrus plants. In another experiment, 100 g N as ASN, either with or without 0.75 g
DMPP (1% DMPP relative to NH4
+-N) was applied to 6-year-old citrus plants grown individually outdoors in containers. Concentrations of NH4
+-N and NO3
–-N at different soil depths and N distribution in the soil profile after consecutive flood irrigations were monitored. In
the ASN-amended soil, nitrification was faster, whereas the addition of the inhibitor led to the maintenance of relatively
high levels of NH4
+-N and NO3
–-N in soil for longer than when ASN was added alone. At the end of the experiment (120 days) 68.5% and 53.1% of the applied
N was leached below 0.60 m in the ASN and ASN+DMPP treatments, respectively. Also, leaf N levels were higher in plants fertilized
with ASN+DMPP. Collectively, these results indicate that the DMPP nitrification inhibitor improved N fertilizer efficiency
and reduced NO3
– leaching losses by retaining the applied N in the ammoniacal form.
Received: 31 May 1999 |
| |
Keywords: | Citrus Nitrification inhibitor 3 4-Dimethylpyrazole phosphate Nitrogen fertilizer efficiency Nitrate leaching |
本文献已被 SpringerLink 等数据库收录! |
|