Abstract
Two years field plot experiment was conducted to study the effects of different N application rates on the yield and nitrogen utilization efficiency of summer maize(Zhengdan958). The results indicated that the yield increased at first and then decreased with the increase of N application rates, and the relationship of yield to N application rates corresponded to quadratic equation. Reasonable N application rate increased grain yield significantly. With the increase of N application rate harvest index(HI) and N harvest index(NHI) decreased. The highest HI and NHI was obtained at N application of 189 kg/ha(N189) and 178 kg/ha(N178). Excessive N application rate reduced N recovery efficiency(NRE) and N partial fertilizer productivity(NPFP) by 29%-55% and 32-64 kg/kg compared with N189and N178, respectively. Agronomic efficiency(AE) and physiological efficiency(PE) increased at first then decreased with the increase N application rate, and the highest AE and PE were appeared at N application rate of 200 kg/ha.Surface soil NO3--N content at mature stage and N apparent losses ratio increased with the increase of nitrogen application when N rates were over 200 kg/ha. Comprehensive consideration, the recommendation of N application rate for summer maize should be controlled in less than 200 kg/ha.
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Claims 12
Claim · model-written summary
Summer maize yield increased at first and then decreased as N application rate increased.
- Treatment
- N application ratese1
- Outcome
- yielde1
- Direction
- increased at first and then decreasede1
- Setting
- field plote0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two years field plot experiment was conducted to study the effects of different N application rates on the yield and nitrogen utilization efficiency of summer maize(Zhengdan958)”
e1“the yield increased at first and then decreased with the increase of N application rates, and the relationship of yield to N application rates corresponded to quadratic equation”
Claim · model-written summary
The relationship of summer maize yield to N application rate corresponded to a quadratic equation.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two years field plot experiment was conducted to study the effects of different N application rates on the yield and nitrogen utilization efficiency of summer maize(Zhengdan958)”
e1“the relationship of yield to N application rates corresponded to quadratic equation”
Claim · model-written summary
Reasonable N application rate significantly increased summer maize grain yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two years field plot experiment was conducted to study the effects of different N application rates on the yield and nitrogen utilization efficiency of summer maize(Zhengdan958)”
e2“Reasonable N application rate increased grain yield significantly”
Claim · model-written summary
Harvest index and N harvest index of summer maize decreased as N application rate increased.
- Treatment
- increase of N application ratee3
- Outcome
- harvest index(HI) and N harvest index(NHI)e3
- Direction
- decreasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two years field plot experiment was conducted to study the effects of different N application rates on the yield and nitrogen utilization efficiency of summer maize(Zhengdan958)”
e3“With the increase of N application rate harvest index(HI) and N harvest index(NHI) decreased. The highest HI and NHI was obtained at N application of 189 kg/ha(N189) and 178 kg/ha(N178)”
Claim · model-written summary
Harvest index of summer maize was highest at N application of 189 kg/ha (N189).
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two years field plot experiment was conducted to study the effects of different N application rates on the yield and nitrogen utilization efficiency of summer maize(Zhengdan958)”
e3“With the increase of N application rate harvest index(HI) and N harvest index(NHI) decreased. The highest HI and NHI was obtained at N application of 189 kg/ha(N189) and 178 kg/ha(N178)”
Claim · model-written summary
N harvest index of summer maize was highest at N application of 178 kg/ha (N178).
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two years field plot experiment was conducted to study the effects of different N application rates on the yield and nitrogen utilization efficiency of summer maize(Zhengdan958)”
e3“With the increase of N application rate harvest index(HI) and N harvest index(NHI) decreased. The highest HI and NHI was obtained at N application of 189 kg/ha(N189) and 178 kg/ha(N178)”
Claim · model-written summary
Excessive N application rate reduced N recovery efficiency of summer maize by 29%-55% compared with N189 and N178.
- Treatment
- Excessive N application ratee4
- Outcome
- N recovery efficiency(NRE)e4
- Direction
- reducede4
- Value
- 29%-55%e4
- Comparator
- N189and N178e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two years field plot experiment was conducted to study the effects of different N application rates on the yield and nitrogen utilization efficiency of summer maize(Zhengdan958)”
e4“Excessive N application rate reduced N recovery efficiency(NRE) and N partial fertilizer productivity(NPFP) by 29%-55% and 32-64 kg/kg compared with N189and N178, respectively”
Claim · model-written summary
Excessive N application rate reduced N partial fertilizer productivity of summer maize by 32-64 kg/kg compared with N189 and N178.
- Treatment
- Excessive N application ratee4
- Outcome
- N partial fertilizer productivity(NPFP)e4
- Direction
- reducede4
- Value
- 32-64 kg/kge4
- Comparator
- N189and N178e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two years field plot experiment was conducted to study the effects of different N application rates on the yield and nitrogen utilization efficiency of summer maize(Zhengdan958)”
e4“Excessive N application rate reduced N recovery efficiency(NRE) and N partial fertilizer productivity(NPFP) by 29%-55% and 32-64 kg/kg compared with N189and N178, respectively”
Claim · model-written summary
Agronomic and physiological efficiency of summer maize increased at first and then decreased as N application rate increased.
- Treatment
- N application ratee5
- Outcome
- Agronomic efficiency(AE) and physiological efficiency(PE)e5
- Direction
- increased at first then decreasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two years field plot experiment was conducted to study the effects of different N application rates on the yield and nitrogen utilization efficiency of summer maize(Zhengdan958)”
e5“Agronomic efficiency(AE) and physiological efficiency(PE) increased at first then decreased with the increase N application rate, and the highest AE and PE were appeared at N application rate of 200 kg/ha”
Claim · model-written summary
Agronomic and physiological efficiency of summer maize were highest at N application of 200 kg/ha.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two years field plot experiment was conducted to study the effects of different N application rates on the yield and nitrogen utilization efficiency of summer maize(Zhengdan958)”
e5“Agronomic efficiency(AE) and physiological efficiency(PE) increased at first then decreased with the increase N application rate, and the highest AE and PE were appeared at N application rate of 200 kg/ha”
Claim · model-written summary
When N rates were over 200 kg/ha, surface soil NO3--N content at mature stage and N apparent loss ratio of summer maize increased with nitrogen application.
- Treatment
- nitrogen applicatione6
- Outcome
- Surface soil NO3--N content at mature stage and N apparent losses ratioe6
- Direction
- increasede6
- Qualifier
- when N rates were over 200 kg/hae6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two years field plot experiment was conducted to study the effects of different N application rates on the yield and nitrogen utilization efficiency of summer maize(Zhengdan958)”
e6“Surface soil NO3--N content at mature stage and N apparent losses ratio increased with the increase of nitrogen application when N rates were over 200 kg/ha”
Claim · model-written summary
The authors recommend limiting N application for summer maize to less than 200 kg/ha.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“the recommendation of N application rate for summer maize should be controlled in less than 200 kg/ha”
The same questions in other papers
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- negative
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See all 2,185 papers →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.