Abstract
Effect of nitrogen-catch crop(sweet maize) on vegetable yields and nitrate content of vegetable rotation system in north China was studied.The results showed that nitrate content in soil profile and nitrate content of spinach reduced;and vegetable yield also decreased obviously after the introduction of nitrogen-catch crop under traditional applied N-fertilizer treatment.Nitrate content in soil profile(0~120 cm) reduced from 1 772 kg/hm2 before seeding to 653 kg/hm2 after harvest.Nitrate content of spinach in 2002 reduced by 42 % compared with that in 2001,but spinach yield in 2002 reduced by 81 %.The effect of nitrogen-catch crop on nitrate content in the whole soil profile was small under the improved and economic applied N-fertilizer treatments,but nitrate content and vegetable yield reduced obviously.Nitrate content of spinach in 2002 reduced by 28 % and 23 %,respectively,compared with those in 2001.Meanwhile spinach yield reduced by 84 % and 88 %.With a view to reduce the latent risk of nitrate leaching,the method of nitrogen-catch crop could be adopted in traditional farming.However,the improved and economic applied N-fertilizer treatment was improper.
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Claims 10
Claim · model-written summary
Soil profile nitrate fell from 1 772 to 653 kg/hm2 after catch crop harvest.
- Outcome
- Nitrate content in soil profile(0~120 cm)e0
- Direction
- reducede0
- Value
- 653 kg/hm2e0
- Qualifier
- 1 772 kg/hm2e0
- Comparator
- before seedinge0
Not reportedTaxonTreatment
Verbatim
e0“Nitrate content in soil profile(0~120 cm) reduced from 1 772 kg/hm2 before seeding to 653 kg/hm2 after harvest.”
Claim · model-written summary
Spinach nitrate content fell by 42% in 2002 under traditional nitrogen treatment.
- Taxon
- spinach
Spinacia oleraceae0 - Treatment
- traditional applied N-fertilizer treatmente1
- Outcome
- Nitrate contente0
- Direction
- reducede0
- Value
- 42 %e0
- Comparator
- 2001e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate content of spinach in 2002 reduced by 42 % compared with that in 2001”
e1“under traditional applied N-fertilizer treatment”
Claim · model-written summary
Spinach yield fell by 81% in 2002 under traditional nitrogen treatment.
- Taxon
- spinachSpinacia oleraceae0
- Treatment
- traditional applied N-fertilizer treatmente1
- Outcome
- spinach yielde0
- Direction
- reducede0
- Value
- 81 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“spinach yield in 2002 reduced by 81 %”
e1“under traditional applied N-fertilizer treatment”
Claim · model-written summary
Catch cropping had a small effect on soil profile nitrate with improved and economic nitrogen rates.
- Treatment
- nitrogen-catch crope0
- Outcome
- nitrate content in the whole soil profilee0
- Direction
- smalle0
- Qualifier
- improved and economic applied N-fertilizer treatmentse0
Not reportedTaxonComparator
Verbatim
e0“The effect of nitrogen-catch crop on nitrate content in the whole soil profile was small under the improved and economic applied N-fertilizer treatments”
Claim · model-written summary
Spinach nitrate content fell by 28% under improved nitrogen treatment.
- Taxon
- spinachSpinacia oleraceae0
- Treatment
- improvede1
- Outcome
- Nitrate contente0
- Direction
- reducede0
- Value
- 28 %e0
- Comparator
- 2001e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate content of spinach in 2002 reduced by 28 % and 23 %,respectively,compared with those in 2001.”
e1“improved and economic applied N-fertilizer treatments”
Claim · model-written summary
Spinach nitrate content fell by 23% under economic nitrogen treatment.
- Taxon
- spinachSpinacia oleraceae0
- Treatment
- economice1
- Outcome
- Nitrate contente0
- Direction
- reducede0
- Value
- 23 %e0
- Comparator
- 2001e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate content of spinach in 2002 reduced by 28 % and 23 %,respectively,compared with those in 2001.”
e1“improved and economic applied N-fertilizer treatments”
Claim · model-written summary
Spinach yield fell by 84% under improved nitrogen treatment.
- Taxon
- spinachSpinacia oleraceae0
- Treatment
- improvede1
- Outcome
- spinach yielde0
- Direction
- reducede0
- Value
- 84 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Meanwhile spinach yield reduced by 84 % and 88 %.”
e1“improved and economic applied N-fertilizer treatments”
Claim · model-written summary
Spinach yield fell by 88% under economic nitrogen treatment.
- Taxon
- spinachSpinacia oleraceae0
- Treatment
- economice1
- Outcome
- spinach yielde0
- Direction
- reducede0
- Value
- 88 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Meanwhile spinach yield reduced by 84 % and 88 %.”
e1“improved and economic applied N-fertilizer treatments”
Claim · model-written summary
The authors recommend a nitrogen catch crop under traditional farming to reduce nitrate leaching risk.
- Outcome
- nitrogen-catch crop could be adopted in traditional farminge0
Not reportedTaxon
Verbatim
e0“With a view to reduce the latent risk of nitrate leaching,the method of nitrogen-catch crop could be adopted in traditional farming.”
Claim · model-written summary
The authors consider improved and economic nitrogen fertilizer treatment unsuitable.
- Outcome
- improved and economic applied N-fertilizer treatment was impropere0
Not reportedTaxon
Verbatim
e0“However,the improved and economic applied N-fertilizer treatment was improper.”
The same questions in other papers
nitrogen · yield · Spinacia oleracea (spinach)Results differ
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20 papers in the same direction as this paper · 14 in the opposite direction
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See all 35 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.