Abstract
A combination of careful irrigation and nitrogen(N) management is needed to improve N uptake efficiency and to minimize fertilizer N loss in the arid oasis agricultural area of northwest China.A field experiment was conducted to investigate the effects of different irrigation and N application rates on plant N uptake,soil nitrate nitrogen(NO-3-N) distribution in soil profile and fertilizer N loss on no-tillage farmland with standing stubble in the oasis region of Shiyang river basin,Gansu province.The experiment followed a completely randomized split-plot design,taking flood irrigation(conventional irrigation(327 mm),20% water-saving irrigation(261 mm),40% water-saving irrigation(196 mm)) and N fertilizer application rates(0,140,221,300 kg/hm2) as the main-plot and split-plot,respectively.Under the experimental condition,nitrogen contents in grain yield increased from 1.55% to 1.71%,and plant N uptake increased from 134 kg/hm2 to 190 kg/hm2 within amount of irrigation water increased from 196 mm to 327 mm.Nitrogen contents in grain yield and in straw yield,and plant N uptake did not increase significantly when N rate was above 221 kg/hm2.Compared with no N application,the increases of plant N uptake,in 300,221,140 kg/hm2,were 47%,37% and 18%,respectively.At harvesting stage,the NO-3-N contents in 0-60 cm depth soil profiles decreased with the amounts of irrigation and increased with N supplies,and irrigation and nitrogen supply levels had not evidently affect on NO-3-N contents below 0-60 cm depth in soil.Compared with no N application,the increases of fertilizer N loss,in 300,221,140 kg/hm2,were 186,137,94 kg/hm2,respectively.
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Claims 12
Claim · model-written summary
Grain nitrogen content rose from 1.55% to 1.71% as irrigation rose from 196 to 327 mm.
- Taxon
- Spring Wheat
Triticum aestivumt0 - Treatment
- irrigation water increased from 196 mm to 327 mme0
- Outcome
- nitrogen contents in grain yielde0
- Direction
- increasede0
- Value
- 1.55% to 1.71%e0
- Comparator
- 196 mme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen contents in grain yield increased from 1.55% to 1.71%,and plant N uptake increased from 134 kg/hm2 to 190 kg/hm2 within amount of irrigation water increased from 196 mm to 327 mm”
t0“Spring Wheat”
Claim · model-written summary
Plant N uptake rose from 134 to 190 kg/hm2 as irrigation rose from 196 to 327 mm.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- irrigation water increased from 196 mm to 327 mme0
- Outcome
- plant N uptakee0
- Direction
- increasede0
- Value
- 134 kg/hm2 to 190 kg/hm2e0
- Comparator
- 196 mme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant N uptake increased from 134 kg/hm2 to 190 kg/hm2 within amount of irrigation water increased from 196 mm to 327 mm”
t0“Spring Wheat”
Claim · model-written summary
Grain and straw N contents and plant N uptake did not increase significantly above 221 kg/hm2 N.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- N rate was above 221 kg/hm2e0
- Outcome
- Nitrogen contents in grain yield and in straw yield,and plant N uptakee0
- Direction
- did not increasee0
- Comparator
- 221 kg/hm2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen contents in grain yield and in straw yield,and plant N uptake did not increase significantly when N rate was above 221 kg/hm2.”
t0“Spring Wheat”
Claim · model-written summary
Plant N uptake increased 47% at 300 kg/hm2 N versus no N.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- 300e0
- Outcome
- plant N uptakee0
- Direction
- increasese0
- Value
- 47%e0
- Comparator
- no N applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with no N application,the increases of plant N uptake,in 300,221,140 kg/hm2,were 47%,37% and 18%,respectively.”
t0“Spring Wheat”
Claim · model-written summary
Plant N uptake increased 37% at 221 kg/hm2 N versus no N.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- 221e0
- Outcome
- plant N uptakee0
- Direction
- increasese0
- Value
- 37%e0
- Comparator
- no N applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with no N application,the increases of plant N uptake,in 300,221,140 kg/hm2,were 47%,37% and 18%,respectively.”
t0“Spring Wheat”
Claim · model-written summary
Plant N uptake increased 18% at 140 kg/hm2 N versus no N.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- 140 kg/hm2e0
- Outcome
- plant N uptakee0
- Direction
- increasese0
- Value
- 18%e0
- Comparator
- no N applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with no N application,the increases of plant N uptake,in 300,221,140 kg/hm2,were 47%,37% and 18%,respectively.”
t0“Spring Wheat”
Claim · model-written summary
Soil nitrate in the 0–60 cm profile decreased as irrigation increased.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- amounts of irrigatione0
- Outcome
- NO-3-N contents in 0-60 cm depth soil profilese0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the NO-3-N contents in 0-60 cm depth soil profiles decreased with the amounts of irrigation”
t0“Spring Wheat”
Claim · model-written summary
Soil nitrate in the 0–60 cm profile increased with N supply.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- N suppliese0
- Outcome
- NO-3-N contents in 0-60 cm depth soil profilese0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the NO-3-N contents in 0-60 cm depth soil profiles decreased with the amounts of irrigation and increased with N supplies”
t0“Spring Wheat”
Claim · model-written summary
Irrigation and N supply had no evident effect on nitrate below 60 cm.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- irrigation and nitrogen supply levelse0
- Outcome
- NO-3-N contents below 0-60 cm depth in soile0
- Direction
- had not evidently affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation and nitrogen supply levels had not evidently affect on NO-3-N contents below 0-60 cm depth in soil”
t0“Spring Wheat”
Claim · model-written summary
Fertilizer N loss increased by 186 kg/hm2 at 300 kg/hm2 N versus no N.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- 300e0
- Outcome
- fertilizer N losse0
- Direction
- increasese0
- Value
- 186e0
- Comparator
- no N applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with no N application,the increases of fertilizer N loss,in 300,221,140 kg/hm2,were 186,137,94 kg/hm2,respectively.”
t0“Spring Wheat”
Claim · model-written summary
Fertilizer N loss increased by 137 kg/hm2 at 221 kg/hm2 N versus no N.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- 221e0
- Outcome
- fertilizer N losse0
- Direction
- increasese0
- Value
- 137e0
- Comparator
- no N applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with no N application,the increases of fertilizer N loss,in 300,221,140 kg/hm2,were 186,137,94 kg/hm2,respectively.”
t0“Spring Wheat”
Claim · model-written summary
Fertilizer N loss increased by 94 kg/hm2 at 140 kg/hm2 N versus no N.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- 140 kg/hm2e0
- Outcome
- fertilizer N losse0
- Direction
- increasese0
- Value
- 94 kg/hm2e0
- Comparator
- no N applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with no N application,the increases of fertilizer N loss,in 300,221,140 kg/hm2,were 186,137,94 kg/hm2,respectively.”
t0“Spring Wheat”
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