Abstract
ABSTRACT Increasing nitrogen use efficiency in agricultural fields is crucial for sustainable agricultural development. In a 2‐year greenhouse study, we compared two methods, subsurface irrigation with ceramic emitters (SICE) and subsurface drip irrigation (SDI), to evaluate their effects on soil moisture and nitrogen distribution, photosynthetic efficiency and plant stoichiometry. The results showed that SICE can reduce the soil nitrate nitrogen content by approximately 20% while maintaining the soil moisture content at 70%–80%, improving the photosynthetic efficiency and melon yield. Under the optimal yield treatment (applying 60.67 kg of nitrogen fertilizer per hectare), compared with SDI, SICE increased yield by 8%, water productivity by 13%, nitrogen absorption efficiency by 4% and nitrogen use efficiency by 3%. In addition, by analysing the stoichiometric characteristics of melon at different nitrogen fertilizer application rates and growth stages under the two irrigation methods, we found that the main reason for the increase in SICE yield was the coupled effect of the increase in plant photosynthetic efficiency and the need for plants to maintain their internal stoichiometric balance.
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Claims 8
Claim · model-written summary
Ceramic emitter irrigation reduced soil nitrate nitrogen by about 20%.
- Taxon
- Melons
.jpg?width=60)
Cucumis meloe0 - Treatment
- SICEe1
- Outcome
- soil nitrate nitrogen contente1
- Direction
- reducee1
- Value
- approximately 20%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Greenhouse Melons”
e1“SICE can reduce the soil nitrate nitrogen content by approximately 20%”
Claim · model-written summary
Ceramic emitter irrigation maintained soil moisture at 70–80%.
- Taxon
- MelonsCucumis meloe0
- Treatment
- Subsurface Irrigation With Ceramic Emitterse0
- Outcome
- soil moisture contente1
- Direction
- maintaininge1
- Value
- 70%–80%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subsurface Irrigation With Ceramic Emitters Improved the Water Productivity and Nitrogen Use Efficiency of Greenhouse Melons.”
e1“maintaining the soil moisture content at 70%–80%”
Claim · model-written summary
Ceramic emitter irrigation improved photosynthetic efficiency.
- Taxon
- MelonsCucumis meloe0
- Treatment
- Subsurface Irrigation With Ceramic Emitterse0
- Outcome
- photosynthetic efficiencye1
- Direction
- improvinge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subsurface Irrigation With Ceramic Emitters Improved the Water Productivity and Nitrogen Use Efficiency of Greenhouse Melons.”
e1“improving the photosynthetic efficiency and melon yield”
Claim · model-written summary
At the optimal nitrogen rate, SICE raised yield 8% versus SDI.
- Taxon
- melonCucumis meloe0
- Treatment
- SICEe2
- Outcome
- yielde2
- Direction
- increasede2
- Value
- 8%e2
- Qualifier
- applying 60.67 kg of nitrogen fertilizer per hectaree1
- Comparator
- SDIe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“melon yield”
e1“applying 60.67 kg of nitrogen fertilizer per hectare”
e2“compared with SDI, SICE increased yield by 8%”
Claim · model-written summary
At the optimal nitrogen rate, SICE raised water productivity 13% versus SDI.
- Taxon
- melonCucumis meloe0
- Treatment
- SICEe1
- Outcome
- water productivitye1
- Direction
- increasede1
- Value
- 13%e1
- Comparator
- SDIe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“melon yield”
e1“compared with SDI, SICE increased yield by 8%, water productivity by 13%”
Claim · model-written summary
At the optimal nitrogen rate, SICE raised nitrogen absorption efficiency 4% versus SDI.
- Taxon
- melonCucumis meloe0
- Treatment
- SICEe1
- Outcome
- nitrogen absorption efficiencye1
- Direction
- increasede1
- Value
- 4%e1
- Comparator
- SDIe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“melon yield”
e1“compared with SDI, SICE increased yield by 8%, water productivity by 13%, nitrogen absorption efficiency by 4%”
Claim · model-written summary
At the optimal nitrogen rate, SICE raised nitrogen use efficiency 3% versus SDI.
- Taxon
- melonCucumis meloe0
- Treatment
- SICEe1
- Outcome
- nitrogen use efficiencye1
- Direction
- increasede1
- Value
- 3%e1
- Comparator
- SDIe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“melon yield”
e1“compared with SDI, SICE increased yield by 8%, water productivity by 13%, nitrogen absorption efficiency by 4% and nitrogen use efficiency by 3%”
Claim · model-written summary
Authors attribute the SICE yield gain to improved photosynthesis coupled with internal stoichiometric balance.
- Taxon
- melonCucumis meloe0
- Outcome
- increase in SICE yielde1
- Qualifier
- coupled effect of the increase in plant photosynthetic efficiency and the need for plants to maintain their internal stoichiometric balancee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“melon at different nitrogen fertilizer application rates”
e1“the main reason for the increase in SICE yield was the coupled effect of the increase in plant photosynthetic efficiency and the need for plants to maintain their internal stoichiometric balance”
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.