Abstract
The objective of this study was to assess the impacts of nitrogen on the physiological characteristics of the source–sink system of upper fruiting branches under various amounts of nitrogen fertilization. A two-year field experiment was conducted with a Bt cotton cultivar in the Yellow River Basin of China. The growth and yield of cotton of the upper fruiting branches were compared under four nitrogen levels: Control (N0, 0 kg ha−1), low nitrogen (N1, 120 kg ha−1), moderate nitrogen (N2, 240 kg ha−1), and high nitrogen (N3, 480 kg ha−1). The results indicated that in the subtending leaves in upper fruiting branches, chlorophyll content, protein content, and peroxidase (POD) activity dramatically increased with nitrogen application, reaching the highest under the moderate nitrogen treatment. The physiological characters in the seeds had the same trends as in the subtending leaves. Furthermore, the moderate nitrogen rate (240 kg ha−1) had a favorable yield and quality. Our results supported that a moderate nitrogen rate (240 kg ha−1) could coordinate the source–sink growth of cotton in the late stage, enhance the yield and fiber quality, and decrease the cost of fertilizer in the Yellow River Basin of China and other similar ecological areas.
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Claims 5
Claim · model-written summary
Nitrogen application increased leaf chlorophyll and protein contents and POD activity, with maxima at moderate nitrogen.
- Taxon
- Cotton
Gossypium hirsutumt0 - Organ / stage
- subtending leavese0
- Treatment
- nitrogen applicatione0
- Outcome
- chlorophyll content, protein content, and peroxidase (POD) activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cotton”
e0“in the subtending leaves in upper fruiting branches, chlorophyll content, protein content, and peroxidase (POD) activity dramatically increased with nitrogen application, reaching the highest under the moderate nitrogen treatment”
Claim · model-written summary
Seed physiological characteristics followed the leaf response to nitrogen.
- Taxon
- CottonGossypium hirsutumt0
- Organ / stage
- seedse0
- Treatment
- nitrogen treatmente0
- Outcome
- physiological characterse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cotton”
e0“nitrogen treatment. The physiological characters in the seeds had the same trends as in the subtending leaves”
Claim · model-written summary
Moderate nitrogen had favorable cotton yield.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- moderate nitrogen rate (240 kg ha−1)e0
- Outcome
- yielde0
- Direction
- favorablee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cotton”
e0“the moderate nitrogen rate (240 kg ha−1) had a favorable yield and quality”
Claim · model-written summary
Moderate nitrogen had favorable cotton quality.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- moderate nitrogen rate (240 kg ha−1)e0
- Outcome
- qualitye0
- Direction
- favorablee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cotton”
e0“the moderate nitrogen rate (240 kg ha−1) had a favorable yield and quality”
Claim · model-written summary
Authors recommend moderate nitrogen to coordinate late cotton source sink growth and improve yield and fiber quality while lowering fertilizer cost.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- moderate nitrogen rate (240 kg ha−1)e0
- Setting
- Yellow River Basin of Chinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cotton”
e0“a moderate nitrogen rate (240 kg ha−1) could coordinate the source–sink growth of cotton in the late stage, enhance the yield and fiber quality, and decrease the cost of fertilizer in the Yellow River Basin of China”
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