Abstract
In the production of cotton ( Gossypium hirsutum L.), nitrogen fertilization is one of the most costly crop practices, but important to reach high yields. However, high nitrogen (N) content in plants does not always translate into a high fibre production. One way of assessing the efficiency of the N fertilizer is through the enzymatic activity of the nitrate reductase (NR). This is a key enzyme in N assimilation, whose activity is regulated by a number of endogenous and exogenous factors that determine yield. The aim of this study was to assess the effect of N fertilization on yield, fibre quality, biomass, and NR enzymatic activity in vivo in the cotton variety Fiber Max 989. The evaluated application rates were 0, 50, 100, and 150 kg/ha of N, using urea as a source (46% N) in a randomizedblock design with three replicates. At harvest, the maximum yield of seed cotton and the greatest accumulation of total foliar biomass through time was reached after applying 150 kg N/ha. The different N-application rates did not affect the components of cotton-fibre quality. The activity of endogenous NR was greater on plants where 150 kg N/ha were applied. The highest cotton yield and N contents were obtained on these plants. Therefore, the NR activity in vivo could be used as a bioindicator of the N nutritional level in cotton.
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Claims 6
Claim · model-written summary
The 150 kg N/ha rate gave maximum seed cotton yield.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- 150 kg N/hae0
- Outcome
- yield of seed cottone0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the maximum yield of seed cotton and the greatest accumulation of total foliar biomass through time was reached after applying 150 kg N/ha”
Claim · model-written summary
The 150 kg N/ha rate gave greatest foliar biomass accumulation.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- 150 kg N/hae0
- Outcome
- accumulation of total foliar biomasse0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the maximum yield of seed cotton and the greatest accumulation of total foliar biomass through time was reached after applying 150 kg N/ha”
Claim · model-written summary
Nitrogen application rate did not affect cotton fibre quality components.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- different N-application ratese0
- Outcome
- components of cotton-fibre qualitye0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The different N-application rates did not affect the components of cotton-fibre quality”
Claim · model-written summary
Endogenous nitrate reductase activity was greater at 150 kg N/ha.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- 150 kg N/hae0
- Gene
- endogenous NRe0
- Outcome
- activity of endogenous NRe0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activity of endogenous NR was greater on plants where 150 kg N/ha were applied”
e1“cotton variety Fiber Max 989”
Claim · model-written summary
Cotton nitrogen content was highest at the 150 kg N/ha rate.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- 150 kg N/hae1
- Outcome
- N contentse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest cotton yield and N contents were obtained on these plants”
e1“plants where 150 kg N/ha were applied”
Claim · model-written summary
Authors propose in vivo NR activity as an indicator of cotton nitrogen nutritional level.
- Taxon
- cottonGossypium hirsutume0
- Gene
- NRe0
- Outcome
- bioindicator of the N nutritional levele0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the NR activity in vivo could be used as a bioindicator of the N nutritional level in cotton”
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