Abstract
The aim of this experiment was to evaluate the effects of adding DMPP (3,4-dimethylpyrazole phosphate) to urea on nitrate leaching and maize (Zea mays L.) yield over two growing seasons. Two nitrogen (N) levels (optimum and excessive) were applied to an irrigated maize crop under Mediterranean conditions. There were five treatments: optimal N (as urea) and the same dose plus DMPP; optimal N (as urea plus 40 kg N/ha) and the same N dose plus DMPP; and a control with no added N fertilizer. The maize was irrigated with an overhead mobile-line sprinkler system. EnviroSCAN probes were used to determine drainage and evapotranspiration and ceramic cups to obtain soil solution samples at a soil depth of 1.4 m. The use of DMPP with urea reduced nitrate leaching. No phytotoxic effects were observed due to the DMPP. There were no differences in grain yield between treatments with and without DMPP at the same rate of N. When DMPP was applied, sodium was displaced from the soil exchange complex due to increased NH4+ concentration, which also increased the electrical conductivity of soil in the drainage zone.
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Claims 5
Claim · model-written summary
DMPP with urea reduced nitrate leaching.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of DMPP with urea reduced nitrate leaching.”
t0“maize”
Claim · model-written summary
No phytotoxic effects of DMPP were observed in maize.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No phytotoxic effects were observed due to the DMPP.”
t0“maize”
Claim · model-written summary
Maize grain yield did not differ with versus without DMPP at the same nitrogen rate.
- Treatment
- DMPPe0
- Outcome
- grain yielde0
- Direction
- no differencese0
- Qualifier
- same rate of Ne0
- Comparator
- without DMPPe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were no differences in grain yield between treatments with and without DMPP at the same rate of N.”
t0“maize”
Claim · model-written summary
DMPP application displaced sodium from the soil exchange complex as NH4+ increased.
- Treatment
- DMPPe0
- Compound
- NH4+e0
- Outcome
- sodium was displaced from the soil exchange complexe0
- Qualifier
- increased NH4+ concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When DMPP was applied, sodium was displaced from the soil exchange complex due to increased NH4+ concentration”
t0“maize”
Claim · model-written summary
The increased NH4+ concentration increased electrical conductivity in the soil drainage zone.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“due to increased NH4+ concentration, which also increased the electrical conductivity of soil in the drainage zone.”
t0“maize”
The same questions in other papers
nitrogen · nutrient: content · Zea mays (maize)Positive and negative results
402 papers in the same direction as this paper · 83 in the opposite direction · 3 reporting no difference from an alternative
- no effect
- no effect
- negative
485 papers more in this group
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