Abstract
Soil residual N is a potential factor threatening the environment, but it is also an N fertilizer resource. Few studies have evaluated the fate of soil residual N under agronomic practice. The objective of this study was to investigate the distribution of residual N and its possible influencing factors with different irrigation regimes. Under three N residual situations created by the previous season using the 15N labeled urea, we employed lettuce as the plant material and three lower limits of drip irrigation including 75% (DR1), 65% (DR2), and 55% (DR3) accounting for the field water capacity as experimental treatments. A furrow irrigation treatment (FI) with the same irrigation regime as DR2 was used as control. Results showed that 2.1–4.8% of the residual 15N from the previous season was absorbed by the succeeding lettuce, 78.0–84.4% was still remained in the 0–80 cm soil, and 10.9–20.0% was unaccounted for. After harvest of succeeding lettuces, the soil residual 15N mainly existed in the mineral form. Moreover, the lettuce reuse efficiency for15N was positively correlated with the total residual 15N amount (p < 0.01) and the mineral 15N amount (p < 0.01). The overall results indicated that an appropriate irrigation regime (DR2) was conducive to promoting absorption of residual N by succeeding crop.
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Claims 7
Claim · model-written summary
About 2.1–4.8% of the residual 15N from the previous season was absorbed by the succeeding lettuce.
- Taxon
- lettuce
Lactuca sativae0 - Outcome
- absorbed by the succeeding lettucee1
- Value
- 2.1–4.8%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we employed lettuce as the plant material”
e1“2.1–4.8% of the residual 15N from the previous season was absorbed by the succeeding lettuce”
Claim · model-written summary
About 78.0–84.4% of the residual 15N remained in the 0–80 cm soil.
- Taxon
- lettuceLactuca sativae0
- Outcome
- still remained in the 0–80 cm soile2
- Value
- 78.0–84.4%e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we employed lettuce as the plant material”
e2“78.0–84.4% was still remained in the 0–80 cm soil”
Claim · model-written summary
About 10.9–20.0% of the residual 15N was unaccounted for.
- Taxon
- lettuceLactuca sativae0
- Outcome
- unaccounted fore3
- Value
- 10.9–20.0%e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we employed lettuce as the plant material”
e3“10.9–20.0% was unaccounted for”
Claim · model-written summary
After harvest of the succeeding lettuce, soil residual 15N existed mainly in mineral form.
- Taxon
- lettuceLactuca sativae4
- Outcome
- soil residual 15Ne4
- Qualifier
- mainly existed in the mineral forme4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“After harvest of succeeding lettuces, the soil residual 15N mainly existed in the mineral form”
Claim · model-written summary
Lettuce reuse efficiency for 15N was positively correlated with the total residual 15N amount.
- Taxon
- lettuceLactuca sativae5
- Compound
- total residual 15N amounte5
- Outcome
- lettuce reuse efficiency for15Ne5
- Direction
- positively correlatede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“the lettuce reuse efficiency for15N was positively correlated with the total residual 15N amount (p < 0.01) and the mineral 15N amount (p < 0.01)”
Claim · model-written summary
Lettuce reuse efficiency for 15N was positively correlated with the mineral 15N amount.
- Taxon
- lettuceLactuca sativae5
- Compound
- mineral 15N amounte5
- Outcome
- lettuce reuse efficiency for15Ne5
- Direction
- positively correlatede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“the lettuce reuse efficiency for15N was positively correlated with the total residual 15N amount (p < 0.01) and the mineral 15N amount (p < 0.01)”
Claim · model-written summary
An appropriate irrigation regime (DR2) promoted absorption of residual N by the succeeding lettuce.
- Taxon
- lettuceLactuca sativae0
- Treatment
- irrigation regime (DR2)e7
- Outcome
- absorption of residual N by succeeding crope7
- Direction
- promotinge7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we employed lettuce as the plant material”
e7“The overall results indicated that an appropriate irrigation regime (DR2) was conducive to promoting absorption of residual N by succeeding crop”
The same questions in other papers
irrigation · nutrient: content · Lactuca sativa (garden lettuce)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
4 papers more in this group
See all 8 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.