Abstract
Field experiments were conducted in a solar-heated greenhouse with drip-irrigated tomato to investigate the effects of drip fertigation strategy and frequency on nitrate dynamics, spatial distribution of nitrate, apparent recovery of nitrogen and fertilizer use efficiency in growing season. The results showed that the strategy of applying nutrient at the beginning resulted in a uniform distribution of nitrate in different layers and nitrate in upper layers increased as the fertilization time was transferred towards the end of an irrigation cycle. Nitrate varied more unevenly as frequency decreased during the growing season. Nitrate accumulated at the lateral boundary of the wetted volume, but no significant accumulation was found at the vertical boundary. As the fertilization time was transferred towards the beginning of an irrigation cycle, potential of nitrate moving towards the boundary of wetted volume was more obviously. Accumulation of nitrate in the profile declined with fertilization frequency. Fertilizer use efficiency declined as the fertilization time was transferred towards the end of an irrigation cycle. On this basis, the optimal fertilization strategy was suggested.
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Claims 9
Claim · model-written summary
Applying nutrients at the beginning of irrigation yielded uniform nitrate distribution across soil layers.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- applying nutrient at the beginninge0
- Outcome
- uniform distribution of nitrate in different layerse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the strategy of applying nutrient at the beginning resulted in a uniform distribution of nitrate in different layers”
t0“tomato”
Claim · model-written summary
Later fertilization during irrigation increased nitrate in upper soil layers.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- fertilization time was transferred towards the end of an irrigation cyclee0
- Outcome
- nitrate in upper layerse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate in upper layers increased as the fertilization time was transferred towards the end of an irrigation cycle”
t0“tomato”
Claim · model-written summary
Lower fertigation frequency made nitrate distribution more uneven during the growing season.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- frequency decreasede0
- Outcome
- Nitratee0
- Direction
- more unevenlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate varied more unevenly as frequency decreased during the growing season”
t0“tomato”
Claim · model-written summary
Nitrate accumulated at the lateral boundary of the wetted soil volume.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- Nitrate accumulated at the lateral boundary of the wetted volumee0
- Direction
- accumulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate accumulated at the lateral boundary of the wetted volume”
t0“tomato”
Claim · model-written summary
Nitrate did not accumulate significantly at the vertical boundary of the wetted volume.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- accumulatione0
- Direction
- no significante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant accumulation was found at the vertical boundary”
t0“tomato”
Claim · model-written summary
Moving fertilization toward the start of irrigation increased the potential for nitrate movement to the wetted-volume boundary.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- fertilization time was transferred towards the beginning of an irrigation cyclee0
- Outcome
- potential of nitrate moving towards the boundary of wetted volumee0
- Direction
- more obviouslye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As the fertilization time was transferred towards the beginning of an irrigation cycle, potential of nitrate moving towards the boundary of wetted volume was more obviously”
t0“tomato”
Claim · model-written summary
Soil-profile nitrate accumulation declined as fertilization frequency increased.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- fertilization frequencye0
- Outcome
- Accumulation of nitrate in the profilee0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accumulation of nitrate in the profile declined with fertilization frequency”
t0“tomato”
Claim · model-written summary
Fertilizer use efficiency declined as fertilization moved toward the end of an irrigation cycle.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- fertilization time was transferred towards the end of an irrigation cyclee0
- Outcome
- Fertilizer use efficiencye0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer use efficiency declined as the fertilization time was transferred towards the end of an irrigation cycle”
t0“tomato”
Claim · model-written summary
The authors suggested an optimal fertilization strategy based on the results.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- optimal fertilization strategye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the optimal fertilization strategy was suggested”
t0“tomato”
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