Abstract
Field experiments were conducted to study the effect of different nitrogen application rates on maize yield,nitrogen uptake and utilization under different soil fertilities in Jilin province.The results showed that,the highest N application rates under maximum yields were N 251 and 206 kg/ha for Fanjiatun and Yushu respectively,and the economic optimum N application rates under economic optimum yields were N 227 and 134 kg/ha for Fanjiatun and Yushu respectively.The maximum N absorption rate and total N uptake were significantly improved with the increasing N application rates,and the date of the maximum N absorption rate occurred earlier in Fanjiatun site.The residual nitrate nitrogen in 0-30 cm soil profile increased with N application rates,and nitrate accumulation in 0-30 cm soil profile was observed higher in Yushu than that in Fanjiatun.The nitrogen agronomic efficiency,nitrogen recovery efficiency and nitrogen partial factor productivity in Fanjiatun with lower soil fertility were higher than those in Yushu with higher soil fertility.In summary,it was suggested that for the site like Fanjiatun with lower soil fertility,the high yield could be reached by increasing N application rate,while for the site like Yushu with higher soil fertility,N application rate should be controlled in order to increase the yield and improve N use efficiency.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Maximum yield at Fanjiatun occurred at N 251 kg/ha.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest N application rates under maximum yields were N 251 and 206 kg/ha for Fanjiatun and Yushu respectively”
t0“spring maize”
Claim · model-written summary
Maximum yield at Yushu occurred at N 206 kg/ha.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest N application rates under maximum yields were N 251 and 206 kg/ha for Fanjiatun and Yushu respectively”
t0“spring maize”
Claim · model-written summary
Economic optimum yield at Fanjiatun corresponded to N 227 kg/ha.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the economic optimum N application rates under economic optimum yields were N 227 and 134 kg/ha for Fanjiatun and Yushu respectively”
t0“spring maize”
Claim · model-written summary
Economic optimum yield at Yushu corresponded to N 134 kg/ha.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the economic optimum N application rates under economic optimum yields were N 227 and 134 kg/ha for Fanjiatun and Yushu respectively”
t0“spring maize”
Claim · model-written summary
Increasing nitrogen rates significantly improved the maximum nitrogen absorption rate and total uptake.
- Treatment
- increasing N application ratese0
- Outcome
- maximum N absorption rate and total N uptakee0
- Direction
- improvede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum N absorption rate and total N uptake were significantly improved with the increasing N application rates”
t0“spring maize”
Claim · model-written summary
The date of maximum nitrogen absorption occurred earlier at Fanjiatun.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the date of the maximum N absorption rate occurred earlier in Fanjiatun site”
t0“spring maize”
Claim · model-written summary
Residual nitrate nitrogen in the 0-30 cm soil profile increased with nitrogen rates.
- Treatment
- N application ratese0
- Outcome
- residual nitrate nitrogen in 0-30 cm soil profilee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The residual nitrate nitrogen in 0-30 cm soil profile increased with N application rates”
t0“spring maize”
Claim · model-written summary
Nitrate accumulation in the 0-30 cm soil profile was higher at Yushu than Fanjiatun.
- Outcome
- nitrate accumulation in 0-30 cm soil profilee0
- Direction
- highere0
- Comparator
- Fanjiatune0
- Setting
- Yushue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate accumulation in 0-30 cm soil profile was observed higher in Yushu than that in Fanjiatun”
t0“spring maize”
Claim · model-written summary
Nitrogen agronomic efficiency, recovery efficiency and partial factor productivity were higher at lower-fertility Fanjiatun.
- Outcome
- nitrogen agronomic efficiency,nitrogen recovery efficiency and nitrogen partial factor productivitye0
- Direction
- highere0
- Comparator
- Yushue0
- Setting
- Fanjiatune0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrogen agronomic efficiency,nitrogen recovery efficiency and nitrogen partial factor productivity in Fanjiatun with lower soil fertility were higher than those in Yushu with higher soil fertility”
t0“spring maize”
Claim · model-written summary
The authors suggest increasing nitrogen rates for high yield at lower-fertility sites like Fanjiatun.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for the site like Fanjiatun with lower soil fertility,the high yield could be reached by increasing N application rate”
t0“spring maize”
Claim · model-written summary
The authors advise controlling nitrogen rate at higher-fertility sites like Yushu to improve yield and use efficiency.
- Outcome
- N application rate should be controlled in order to increase the yield and improve N use efficiencye0
- Setting
- Yushue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for the site like Yushu with higher soil fertility,N application rate should be controlled in order to increase the yield and improve N use efficiency”
t0“spring maize”