Abstract
Determining nutrient uptake and accumulation rates by cotton crops is important to define management strategies, especially for transgenic varieties, which are cultivated using high-technology approaches that require substantial investment to maximize yield. Currently in Brazil, the states of Bahia and Mato Grosso are responsible for 84.4 % of the total cotton growing area. In the present study, two trials were conducted in 2013, one that involved planting FM 940 GLT, FM 980 GLT, and FM 913 GLT varieties in the state of Bahia and the other which involved FM 940 GLT and FM 980 GLT varieties in the state of Mato Grosso. The aim of the two trials was to represent the two regions that currently encompass the largest areas of cotton cultivation. Tissue samples, consisting of leaves, stems, and reproductive components, were collected eleven times during the crop cycle for determination of nutrient content and shoot dry matter. After weighing, plant tissue samples were dried and ground to determine nutrient contents. Because there were no overall differences in nutrient contents and biomass accumulation of the varieties during the crop cycle, we undertook joint analysis of the data from all varieties at each site. Favorable climatic conditions in Bahia promoted plant biomass production that was twice as much as plants grown in Mato Grosso, with cotton yields of 6.2 and 3.8 t ha -1 of lint and seed, respectively. The maximum nutrient accumulation occurred between 137-150 days after emergence (DAE) for N; 143-148 for P; 172-185 for K; 100 for Ca; 144-149 for Mg; and 153-158 for S. Maximum uptake ranged from 218-362 kg ha -1 N; 26-53 kg ha -1 P; 233-506 kg ha -1 K; 91-202 kg ha -1 Ca; 28-44 kg ha -1 Mg; and 19-61 kg ha -1 S. On average, the sites revealed nutrient export of 14, 2, 23, 3, 2, and 2 kg t -1 of lint and seed for N, P, K, Ca, Mg, and S, respectively, with little variation among sites. Extraction of nutrients per area by cotton vary among sites, but nutritional requirement of cotton per unit of lint and seeds is similar independently of yield potential.
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Claims 8
Claim · model-written summary
The tested cotton varieties showed no overall differences in nutrient contents and biomass accumulation.
- Taxon
- Cotton
Gossypium hirsutumt0 - Outcome
- nutrient contents and biomass accumulatione0
- Direction
- no overall differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were no overall differences in nutrient contents and biomass accumulation of the varieties during the crop cycle”
t0“Cotton”
Claim · model-written summary
Cotton biomass production in Bahia was twice that in Mato Grosso.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- plant biomass productione0
- Direction
- twice as muche0
- Comparator
- Mato Grossoe0
- Setting
- Bahiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Favorable climatic conditions in Bahia promoted plant biomass production that was twice as much as plants grown in Mato Grosso”
t0“Cotton”
Claim · model-written summary
Cotton lint and seed yield in Bahia was 6.2 t ha -1.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- cotton yieldse0
- Value
- 6.2e0
- Setting
- Bahiae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with cotton yields of 6.2 and 3.8 t ha -1 of lint and seed, respectively.”
e1“Bahia promoted plant biomass production”
t0“Cotton”
Claim · model-written summary
Cotton lint and seed yield in Mato Grosso was 3.8 t ha -1.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- cotton yieldse0
- Value
- 3.8 t ha -1e0
- Setting
- Mato Grossoe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with cotton yields of 6.2 and 3.8 t ha -1 of lint and seed, respectively.”
e1“plants grown in Mato Grosso”
t0“Cotton”
Claim · model-written summary
Maximum cotton nutrient accumulation occurred at nutrient-specific times after emergence.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- maximum nutrient accumulatione0
- Value
- 137-150 days after emergence (DAE)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum nutrient accumulation occurred between 137-150 days after emergence (DAE) for N; 143-148 for P; 172-185 for K; 100 for Ca; 144-149 for Mg; and 153-158 for S.”
t0“Cotton”
Claim · model-written summary
Maximum cotton uptake ranged across nutrients and sites.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- Maximum uptakee0
- Value
- 218-362 kg ha -1 Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum uptake ranged from 218-362 kg ha -1 N; 26-53 kg ha -1 P; 233-506 kg ha -1 K; 91-202 kg ha -1 Ca; 28-44 kg ha -1 Mg; and 19-61 kg ha -1 S.”
t0“Cotton”
Claim · model-written summary
Average cotton nutrient export varied little between sites.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- nutrient exporte0
- Value
- 14, 2, 23, 3, 2, and 2 kg t -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On average, the sites revealed nutrient export of 14, 2, 23, 3, 2, and 2 kg t -1 of lint and seed for N, P, K, Ca, Mg, and S, respectively, with little variation among sites.”
t0“Cotton”
Claim · model-written summary
Nutrient extraction per area varied by site, while requirement per unit lint and seed was similar regardless of yield potential.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- Extraction of nutrients per areae0
- Direction
- varye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Extraction of nutrients per area by cotton vary among sites, but nutritional requirement of cotton per unit of lint and seeds is similar independently of yield potential.”