Abstract
To optimize nitrogen fertilization rate in wheat-maize rotation system in the intensive agriculture areas of North China,the field experiment was carried out to study the effects of nitrogen application rate on soil nitrate nitrogen accumulation and crop yield. The results showed that the amount of nitrogen fertilizer application should be309 kg / ha to guarantee the highest yield of winter wheat. The best economic nitrogen rate for winter wheat was 291 kg / ha. The amount of nitrogen fertilizer application should be 213 kg / ha to guarantee the highest yield of summer maize. The best economic nitrogen rate for summer maize was 199 kg / ha. With increasing N application rate and planting years,nitrate N accumulation in the soil rapidly increased. Compared with the first planting year,soil nitrate accumulation of the treatment( nitrogen rate of 375 kg / ha in wheat season,nitrogen rate of 300 kg / ha in corn season) increased 56. 06% for wheat harvest and 62. 07% for maize harvest after the second planting year. The higher amount of nitrogen,100- 200 cm soil nitrate accumulation proportion of the total would be greater. Nitrogen rate of150 kg / ha in wheat and corn season,the nitrogen fertilizer use efficiency of wheat and corn would maximum,46. 61% and 37. 51% respectively. Considering the amount of nitrogen leaching risk and crop yield,it was advisable to suggest that the N application rate should be controlled within the range of 250- 300 kg / ha for wheat and150- 200 kg / ha for corn,respectively in intensive agricultural region of North China. This would guarantee high yields and prevent excessive accumulation of fertilizer N in the soil and reduce the risk of nitrate N leaching.
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Claims 12
Claim · model-written summary
Winter wheat yield was highest at 309 kg / ha nitrogen.
- Taxon
- winter wheat
Triticum aestivume0 - Outcome
- highest yielde0
- Direction
- higheste0
- Value
- 309 kg / hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“309 kg / ha to guarantee the highest yield of winter wheat”
Claim · model-written summary
The best economic nitrogen rate for winter wheat was 291 kg / ha.
- Taxon
- winter wheatTriticum aestivume0
- Outcome
- best economic nitrogen ratee0
- Value
- 291 kg / hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The best economic nitrogen rate for winter wheat was 291 kg / ha”
Claim · model-written summary
Summer maize yield was highest at 213 kg / ha nitrogen.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“213 kg / ha to guarantee the highest yield of summer maize”
Claim · model-written summary
The best economic nitrogen rate for summer maize was 199 kg / ha.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The best economic nitrogen rate for summer maize was 199 kg / ha”
Claim · model-written summary
Soil nitrate accumulation increased rapidly with nitrogen rate and planting years.
Verbatim
e0“With increasing N application rate and planting years,nitrate N accumulation in the soil rapidly increased”
t0“wheat-maize rotation system”
Claim · model-written summary
After the second year, soil nitrate at wheat harvest increased 56. 06% under the specified nitrogen regime.
- Taxon
- wheatTriticum aestivume0
- Treatment
- nitrogen rate of 375 kg / ha in wheat seasone0
- Outcome
- soil nitrate accumulatione0
- Direction
- increasede0
- Value
- 56. 06%e0
- Comparator
- first planting yeare1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil nitrate accumulation of the treatment( nitrogen rate of 375 kg / ha in wheat season,nitrogen rate of 300 kg / ha in corn season) increased 56. 06% for wheat harvest”
e1“Compared with the first planting year”
Claim · model-written summary
After the second year, soil nitrate at maize harvest increased 62. 07% under the specified nitrogen regime.
- Treatment
- nitrogen rate of 300 kg / ha in corn seasone0
- Outcome
- soil nitrate accumulatione0
- Direction
- increasede0
- Value
- 62. 07%e0
- Comparator
- first planting yeare1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil nitrate accumulation of the treatment( nitrogen rate of 375 kg / ha in wheat season,nitrogen rate of 300 kg / ha in corn season) increased 56. 06% for wheat harvest and 62. 07% for maize harvest”
e1“Compared with the first planting year”
Claim · model-written summary
A higher nitrogen amount raised the fraction of total nitrate at 100- 200 cm.
- Taxon
- wheat-maizet0
- Treatment
- higher amount of nitrogene0
- Outcome
- soil nitrate accumulation proportion of the totale0
- Direction
- greatere0
Not reportedOrgan / stage
Verbatim
e0“The higher amount of nitrogen,100- 200 cm soil nitrate accumulation proportion of the total would be greater”
t0“wheat-maize rotation system”
Claim · model-written summary
Wheat nitrogen fertilizer use efficiency reached 46. 61% at 150 kg / ha nitrogen.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Nitrogen rate of150 kg / hae0
- Outcome
- nitrogen fertilizer use efficiencye0
- Direction
- maximume0
- Value
- 46. 61%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen rate of150 kg / ha in wheat and corn season,the nitrogen fertilizer use efficiency of wheat and corn would maximum,46. 61% and 37. 51% respectively”
Claim · model-written summary
Corn nitrogen fertilizer use efficiency reached 37. 51% at 150 kg / ha nitrogen.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Nitrogen rate of150 kg / hae0
- Outcome
- nitrogen fertilizer use efficiencye0
- Direction
- maximume0
- Value
- 37. 51%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen rate of150 kg / ha in wheat and corn season,the nitrogen fertilizer use efficiency of wheat and corn would maximum,46. 61% and 37. 51% respectively”
Claim · model-written summary
The authors recommend 250- 300 kg / ha nitrogen for wheat.
- Taxon
- wheatTriticum aestivume0
- Outcome
- N application rate should be controlled within the range of 250- 300 kg / hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N application rate should be controlled within the range of 250- 300 kg / ha for wheat”
Claim · model-written summary
The authors recommend 150- 200 kg / ha nitrogen for corn.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- 150- 200 kg / ha for corne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and150- 200 kg / ha for corn”
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