Abstract
Field experiment was conducted to investigate effects of reducing and postponing N application on soil N supply,plant N uptake and utilization of summer maize.The results show that N accumulation rate is increased under the reducing and postponing N application(N 168 kg/ha,1/5 basal,3/5 topdressing at stalk enlongation stage and 1/5 topdressing at silking stage,respectively) compared with farmers' practice(N 240 kg/ha,1/3 basal and 2/3 topdressing at booting stage,respectively),while N use efficiency,dry biomass accumulation,yield and N accumulation amount are not decreased.Moreover,the reducing and postponing N application can improve synchronization of soil N supply and crop demand during the maize growth stages,decrease NO-3-N accumulation of 0-100 cm soil profile,and reduce field apparent N loss at maturity.Therefore,the reducing and postponing N application based on summer maize N uptake at different growth stages is a feasible N management practice,and nitrogen fertilizer could be saved by 30% as compared with farmers' practice.
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Claims 9
Claim · model-written summary
Reduced and postponed N application increased maize N accumulation rate over farmers practice.
- Treatment
- reducing and postponing N applicatione0
- Outcome
- N accumulation ratee0
- Direction
- increasede0
- Comparator
- farmers' practicee1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results show that N accumulation rate is increased under the reducing and postponing N application(N 168 kg/ha,1/5 basal,3/5 topdressing at stalk enlongation stage and 1/5 topdressing at silking stage,respectively) compared with farmers' practice(N 240 kg/ha,1/3 basal and 2/3 topdressing at booting stage,respectively),while N use efficiency,dry biomass accumulation,yield and N accumulation amount are not decreased.”
t0“summer maize”
e1“compared with farmers' practice(N 240 kg/ha,1/3 basal and 2/3 topdressing at booting stage,respectively)”
Claim · model-written summary
Reduced and postponed N application did not decrease N use efficiency.
- Treatment
- reducing and postponing N applicatione0
- Outcome
- N use efficiencye0
- Direction
- not decreasede0
- Comparator
- farmers' practicee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results show that N accumulation rate is increased under the reducing and postponing N application(N 168 kg/ha,1/5 basal,3/5 topdressing at stalk enlongation stage and 1/5 topdressing at silking stage,respectively) compared with farmers' practice(N 240 kg/ha,1/3 basal and 2/3 topdressing at booting stage,respectively),while N use efficiency,dry biomass accumulation,yield and N accumulation amount are not decreased.”
t0“summer maize”
e1“compared with farmers' practice(N 240 kg/ha,1/3 basal and 2/3 topdressing at booting stage,respectively)”
Claim · model-written summary
Reduced and postponed N application did not decrease dry biomass accumulation.
- Treatment
- reducing and postponing N applicatione0
- Outcome
- dry biomass accumulatione0
- Direction
- not decreasede0
- Comparator
- farmers' practicee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results show that N accumulation rate is increased under the reducing and postponing N application(N 168 kg/ha,1/5 basal,3/5 topdressing at stalk enlongation stage and 1/5 topdressing at silking stage,respectively) compared with farmers' practice(N 240 kg/ha,1/3 basal and 2/3 topdressing at booting stage,respectively),while N use efficiency,dry biomass accumulation,yield and N accumulation amount are not decreased.”
t0“summer maize”
e1“compared with farmers' practice(N 240 kg/ha,1/3 basal and 2/3 topdressing at booting stage,respectively)”
Claim · model-written summary
Reduced and postponed N application did not decrease yield.
- Treatment
- reducing and postponing N applicatione0
- Outcome
- yielde0
- Direction
- not decreasede0
- Comparator
- farmers' practicee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results show that N accumulation rate is increased under the reducing and postponing N application(N 168 kg/ha,1/5 basal,3/5 topdressing at stalk enlongation stage and 1/5 topdressing at silking stage,respectively) compared with farmers' practice(N 240 kg/ha,1/3 basal and 2/3 topdressing at booting stage,respectively),while N use efficiency,dry biomass accumulation,yield and N accumulation amount are not decreased.”
t0“summer maize”
e1“compared with farmers' practice(N 240 kg/ha,1/3 basal and 2/3 topdressing at booting stage,respectively)”
Claim · model-written summary
Reduced and postponed N application did not decrease N accumulation amount.
- Treatment
- reducing and postponing N applicatione0
- Outcome
- N accumulation amounte0
- Direction
- not decreasede0
- Comparator
- farmers' practicee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results show that N accumulation rate is increased under the reducing and postponing N application(N 168 kg/ha,1/5 basal,3/5 topdressing at stalk enlongation stage and 1/5 topdressing at silking stage,respectively) compared with farmers' practice(N 240 kg/ha,1/3 basal and 2/3 topdressing at booting stage,respectively),while N use efficiency,dry biomass accumulation,yield and N accumulation amount are not decreased.”
t0“summer maize”
e1“compared with farmers' practice(N 240 kg/ha,1/3 basal and 2/3 topdressing at booting stage,respectively)”
Claim · model-written summary
The treatment improved synchronization of soil N supply and maize demand.
- Treatment
- reducing and postponing N applicatione0
- Outcome
- synchronization of soil N supply and crop demande0
- Direction
- improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover,the reducing and postponing N application can improve synchronization of soil N supply and crop demand during the maize growth stages,decrease NO-3-N accumulation of 0-100 cm soil profile,and reduce field apparent N loss at maturity.”
t0“summer maize”
Claim · model-written summary
The treatment decreased nitrate N accumulation in the 0-100 cm soil profile.
- Treatment
- reducing and postponing N applicatione0
- Outcome
- NO-3-N accumulation of 0-100 cm soil profilee0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover,the reducing and postponing N application can improve synchronization of soil N supply and crop demand during the maize growth stages,decrease NO-3-N accumulation of 0-100 cm soil profile,and reduce field apparent N loss at maturity.”
t0“summer maize”
Claim · model-written summary
The treatment reduced apparent field N loss at maturity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover,the reducing and postponing N application can improve synchronization of soil N supply and crop demand during the maize growth stages,decrease NO-3-N accumulation of 0-100 cm soil profile,and reduce field apparent N loss at maturity.”
t0“summer maize”
Claim · model-written summary
Reduced and postponed N application is recommended as feasible and could save 30% N fertilizer versus farmers practice.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Therefore,the reducing and postponing N application based on summer maize N uptake at different growth stages is a feasible N management practice,and nitrogen fertilizer could be saved by 30% as compared with farmers' practice.”
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