Abstract
Optimal applications of water and fertilizers are important for maintaining yield and reducing environmental pollution in green-house vegetable production. An experiment was conducted to examine nitrogen(N)loss pathways and nitrogen use efficiency(NUE)under different water and fertilizer managements in a tomato-growing greenhouse located in Shunyi, Beijing from August 2009 to January2010. Six different water and fertilizer combinations were designed, including(i)traditional fertilization + traditional irrigation(N1F1)(,ii)optimal fertilization +optimal irrigation(N2F2)(,iii)reduced fertilizer + optimal irrigation(N3F2),(iv)traditional fertilization +conven-tional drip irrigation(N1D1)(,v)the optimal fertilization + optimal drip irrigation(N2D2)and(vi)reduced fertilizer + optimal drip irrigation(N3D2). We used the field observed dataset to calibrate and validate the EU-Rotate N model, and calculated N leaching, gaseous N loss and NUE. The results showed that the amounts of N leaching and gaseous N loss under different treatments accounted for 1%~9% and 5%~14% of total applied N, respectively. Nitrogen leaching for all treatments was in order:N1F1N3F2≈ N2F2N1D1N2D2N3D2. Compared with the corresponding furrow treatments, N leaching under drip treatments was reduced by 72%~87%, gaseous N loss decreased by about 40%, and the NUE increased by 32%~36%. Therefore, optimal fertilization and drip irrigation combination practices could significantly reduce N leaching and gaseous N loss and increase the NUE without decreasing tomato yields.
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Claims 6
Claim · model-written summary
Nitrogen leaching accounted for 1%~9% of applied nitrogen across treatments.
- Taxon
- tomato
Solanum lycopersicumt0 - Outcome
- N leachinge0
- Value
- 1%~9%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amounts of N leaching and gaseous N loss under different treatments accounted for 1%~9% and 5%~14% of total applied N”
t0“tomato-growing greenhouse”
Claim · model-written summary
Gaseous nitrogen loss accounted for 5%~14% of applied nitrogen.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- gaseous N losse0
- Value
- 5%~14%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amounts of N leaching and gaseous N loss under different treatments accounted for 1%~9% and 5%~14% of total applied N”
t0“tomato-growing greenhouse”
Claim · model-written summary
Drip irrigation reduced nitrogen leaching by 72%~87% relative to furrow treatments.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- drip treatmentse0
- Outcome
- N leachinge0
- Direction
- reducede0
- Value
- 72%~87%e0
- Comparator
- corresponding furrow treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the corresponding furrow treatments, N leaching under drip treatments was reduced by 72%~87%”
t0“tomato-growing greenhouse”
Claim · model-written summary
Drip irrigation decreased gaseous nitrogen loss by about 40% relative to furrow treatments.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- drip treatmentse0
- Outcome
- gaseous N losse0
- Direction
- decreasede0
- Value
- about 40%e0
- Comparator
- corresponding furrow treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the corresponding furrow treatments, N leaching under drip treatments was reduced by 72%~87%, gaseous N loss decreased by about 40%”
t0“tomato-growing greenhouse”
Claim · model-written summary
Drip irrigation increased nitrogen use efficiency by 32%~36% relative to furrow treatments.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- drip treatmentse0
- Outcome
- NUEe0
- Direction
- increasede0
- Value
- 32%~36%e0
- Comparator
- corresponding furrow treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the corresponding furrow treatments, N leaching under drip treatments was reduced by 72%~87%, gaseous N loss decreased by about 40%, and the NUE increased by 32%~36%”
t0“tomato-growing greenhouse”
Claim · model-written summary
Optimal fertilization and drip irrigation did not decrease tomato yields.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- optimal fertilization and drip irrigation combination practicese0
- Outcome
- tomato yieldse0
- Direction
- without decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“optimal fertilization and drip irrigation combination practices could significantly reduce N leaching and gaseous N loss and increase the NUE without decreasing tomato yields”
t0“tomato-growing greenhouse”
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