Abstract
Soil salinization in arid regions severely limits cotton growth by restricting nitrogen availability. Optimizing nitrogen application timing in conjunction with effective salt leaching is a potential strategy to enhance nitrogen uptake and improve yield. Therefore, this study aimed to evaluate the effects of nitrogen drip timing on soil salt leaching, available nitrogen distribution in the soil profile, and cotton yield. We conducted an indoor 15 N labeled fertilizer leaching experiment and a two-year field experiment to adjust the nitrogen dripping time while applying the same amount of pure nitrogen. Specifically, “t” was defined as the total duration of one irrigation cycle, and the starting points for nitrogen application were as follows: T1, 1 h; T2, 1 h + 1/3 t h; T3, 1 h + 2/3 t h; CK, 1/3 t h and CK0 (no fertilization treatment). The results of indoor experiments revealed that the 15 N abundance of the T3 treatment was the highest in the 0–20 cm soil layer, which was 57.50 % and 46.51 % higher than that of the T1 and T2 treatments. The results of field experiment show that T3 treatment significantly reduced the total soil salt, which was 25.49 % lower than that of T1 treatment at the bud stage. At the bud stages, the NO 3 - content of T3 treatment was 1.82 times higher than that of T1 treatment. In the boll opening stage, T3 treatment achieved the highest ammonium nitrogen content, which was 23.43 % higher than that of T1 treatment. At the flowering-boll stage, the nitrogen accumulation of T3 treatment was 30.17 % higher than that of CK treatment. The cotton yield was 11.63 % higher of T3 treatment compared to CK treatment. From the perspective of soil salinity, nitrogen distribution, nitrogen accumulation, and cotton yield, T3 treatment effectively removed salt and increased cotton yield. • Delaying fertilization reduced the total salt content of soil and increased the yield. • The later the time node of fertilization, the better the effect of salt displacement and nitrogen increase. • Delayed nitrogen dripping time could not improve the the nitrogen use efficiency.
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Claims 8
Claim · model-written summary
T3 had the highest soil 15 N abundance, 57.50% higher than T1 in the 0–20 cm layer.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- T3e0
- Outcome
- 15 N abundancee0
- Direction
- highere0
- Value
- 57.50 %e0
- Qualifier
- 0–20 cm soil layere0
- Comparator
- T1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“15 N abundance of the T3 treatment was the highest in the 0–20 cm soil layer, which was 57.50 % and 46.51 % higher than that of the T1 and T2 treatments”
t0“Effects of delayed nitrogen fertilizer drip timing on soil total salt, cotton yield and nitrogen fertilizer use efficiency”
Claim · model-written summary
T3 had 46.51% higher soil 15 N abundance than T2.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- T3e0
- Outcome
- 15 N abundancee0
- Direction
- highere0
- Value
- 46.51 %e0
- Comparator
- T2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“15 N abundance of the T3 treatment was the highest in the 0–20 cm soil layer, which was 57.50 % and 46.51 % higher than that of the T1 and T2 treatments”
t0“Effects of delayed nitrogen fertilizer drip timing on soil total salt, cotton yield and nitrogen fertilizer use efficiency”
Claim · model-written summary
T3 reduced total soil salt by 25.49% relative to T1 at bud stage.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- bud stagee0
- Treatment
- T3e0
- Outcome
- total soil salte0
- Direction
- lowere0
- Value
- 25.49 %e0
- Comparator
- T1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“T3 treatment significantly reduced the total soil salt, which was 25.49 % lower than that of T1 treatment at the bud stage”
t0“Effects of delayed nitrogen fertilizer drip timing on soil total salt, cotton yield and nitrogen fertilizer use efficiency”
Claim · model-written summary
T3 soil nitrate content was 1.82 times T1 at bud stage.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- bud stagese0
- Treatment
- T3e0
- Outcome
- NO 3 - contente0
- Direction
- highere0
- Value
- 1.82 timese0
- Comparator
- T1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the bud stages, the NO 3 - content of T3 treatment was 1.82 times higher than that of T1 treatment”
t0“Effects of delayed nitrogen fertilizer drip timing on soil total salt, cotton yield and nitrogen fertilizer use efficiency”
Claim · model-written summary
T3 ammonium nitrogen content was 23.43% higher than T1 at boll opening.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- boll opening stagee0
- Treatment
- T3e0
- Outcome
- ammonium nitrogen contente0
- Direction
- highere0
- Value
- 23.43 %e0
- Comparator
- T1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the boll opening stage, T3 treatment achieved the highest ammonium nitrogen content, which was 23.43 % higher than that of T1 treatment”
t0“Effects of delayed nitrogen fertilizer drip timing on soil total salt, cotton yield and nitrogen fertilizer use efficiency”
Claim · model-written summary
T3 nitrogen accumulation was 30.17% higher than CK at flowering-boll stage.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- flowering-boll stagee0
- Treatment
- T3e0
- Outcome
- nitrogen accumulatione0
- Direction
- highere0
- Value
- 30.17 %e0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the flowering-boll stage, the nitrogen accumulation of T3 treatment was 30.17 % higher than that of CK treatment”
t0“Effects of delayed nitrogen fertilizer drip timing on soil total salt, cotton yield and nitrogen fertilizer use efficiency”
Claim · model-written summary
T3 cotton yield was 11.63% higher than CK.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- T3e0
- Outcome
- cotton yielde0
- Direction
- highere0
- Value
- 11.63 %e0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cotton yield was 11.63 % higher of T3 treatment compared to CK treatment”
Claim · model-written summary
Delayed nitrogen dripping did not improve nitrogen use efficiency.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Delayed nitrogen dripping timee0
- Outcome
- nitrogen use efficiencye0
- Direction
- could not improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delayed nitrogen dripping time could not improve the the nitrogen use efficiency”
t0“Effects of delayed nitrogen fertilizer drip timing on soil total salt, cotton yield and nitrogen fertilizer use efficiency”
The same questions in other papers
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