Abstract
Fertigation with surface drip has been introduced and broadly applied for vegetable cultivation in the Eastern China, which presents high precipitation and always has shallow groundwater. To estimate the influence of high groundwater level on the tomato nitrogen (N) and water use efficiency and develop new sensor-based fertigation technology, experiments were executed in plastic greenhouse in the experimental farm of Yangzhou University located in the suburban of Yangzhou city during 2016-2017 growing seasons using a block randomization with three replications. Three N dosages and 4 watering treatments were carried out in this experiment. The data indicated that irrigation threshold of -35 kPa was optimum to get the maximum production of tomato. In this treatment, the value of estimated plant evapotranspiration (ETc) was much higher than total applied water volume, suggesting high groundwater table had a significant contribution on the tomato ETc and a sensor-based irrigation strategy should be more accurate than the simulated ETc irrigation method to calculate the water demand under this condition. In addition, our results indicated that high groundwater level had a positive effect to alleviating N leaching. Finally, we can conclude that fertigation technology enhanced the N use efficiency (NUE) and water use efficiency (WUE) and three fourths of the calculated N dosage (according to a traditional nutrient equation) was sufficient to optimize tomato yield.
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Claims 7
Claim · model-written summary
An irrigation threshold of -35 kPa maximized tomato production.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- irrigation threshold of -35 kPae0
- Outcome
- production of tomatoe0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation threshold of -35 kPa was optimum to get the maximum production of tomato”
Claim · model-written summary
Estimated plant evapotranspiration exceeded applied water volume under this irrigation treatment.
- Outcome
- estimated plant evapotranspiration (ETc)e0
- Direction
- much highere0
- Comparator
- total applied water volumee0
Not reportedTaxon
Verbatim
e0“the value of estimated plant evapotranspiration (ETc) was much higher than total applied water volume”
Claim · model-written summary
High groundwater contributed significantly to tomato evapotranspiration.
- Taxon
- tomatoSolanum lycopersicume0
- Outcome
- tomato ETce0
- Setting
- high groundwater tablee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high groundwater table had a significant contribution on the tomato ETc”
Claim · model-written summary
High groundwater alleviated nitrogen leaching.
Not reportedTaxon
Verbatim
e0“high groundwater level had a positive effect to alleviating N leaching”
Claim · model-written summary
Fertigation enhanced tomato nitrogen use efficiency.
Not reportedTaxonComparator
Verbatim
e0“fertigation technology enhanced the N use efficiency (NUE) and water use efficiency (WUE)”
Claim · model-written summary
Fertigation enhanced tomato water use efficiency.
Not reportedTaxonComparator
Verbatim
e0“fertigation technology enhanced the N use efficiency (NUE) and water use efficiency (WUE)”
Claim · model-written summary
Three fourths of calculated nitrogen dosage sufficed to optimize tomato yield.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- three fourths of the calculated N dosagee0
- Outcome
- optimize tomato yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“three fourths of the calculated N dosage (according to a traditional nutrient equation) was sufficient to optimize tomato yield”
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