Abstract
Abstract One method of correcting K deficiencies in cotton ( Gossypium hirsutum L.) is by in‐row deep placement of K fertilizer. At present, the mechanisms involved in cotton yield response to deep placement of K have not been elucidated. A field study was conducted in 1990 and 1991 to evaluate root development and dry matter yield of cotton as affected by in‐row subsoiling and placement of K fertilizer. The experiment was located in central Alabama on a Norfolk fine sandy loam (fine‐loamy, siliceous, thermic Typic Kandiudult). Five treatments were compared: (i) check, without in‐row subsoiling; (ii) check, with in‐row subsoiling; (iii) 84 kg K ha −1 surface‐applied, without in‐row subsoiling; (iv) 84 kg K ha −1 surface‐applied, with in‐row subsoiling; and (v) 84 kg K ha −1 deep‐placed, in‐row. Penetrometer readings taken in 1991 demonstrated that the soil has a well‐developed traffic pan at a depth of approximately 15 to 38 cm. In‐row subsoiling disrupted the pan up to 25 cm away from the in‐row position. Root density measurements taken in‐row showed that root growth at depths > 20 cm was improved by in‐row subsoiling and K fertilization. Cotton root growth at depths > 20 cm was generally better for the treatment receiving the deep applied K. However, broadcast K in combination with in‐row subsoiling resulted in the highest productivity and K accumulation per plant. Results of this study suggest that, for cotton production in Alabama, deep placement of K is not superior to broadcast applications of K.
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Claims 8
Claim · model-written summary
The soil had a traffic pan at approximately 15 to 38 cm depth.
- Taxon
- cotton
Gossypium hirsutumt0 - Outcome
- traffic pane0
- Value
- approximately 15 to 38 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the soil has a well‐developed traffic pan at a depth of approximately 15 to 38 cm”
t0“Cotton”
t1“Cotton”
Claim · model-written summary
In-row subsoiling disrupted the traffic pan up to 25 cm away.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- In‐row subsoilinge0
- Outcome
- pane0
- Direction
- disruptede0
- Value
- 25 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In‐row subsoiling disrupted the pan up to 25 cm away from the in‐row position”
t0“Cotton”
t1“Cotton”
Claim · model-written summary
Subsoiling improved cotton root growth below 20 cm.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- in‐row subsoilinge0
- Outcome
- root growthe0
- Direction
- improvede0
- Qualifier
- depths > 20 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth at depths > 20 cm was improved by in‐row subsoiling and K fertilization”
t0“Cotton”
t1“Cotton”
Claim · model-written summary
Potassium fertilization improved cotton root growth below 20 cm.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- K fertilizatione0
- Outcome
- root growthe0
- Direction
- improvede0
- Qualifier
- depths > 20 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth at depths > 20 cm was improved by in‐row subsoiling and K fertilization”
t0“Cotton”
t1“Cotton”
Claim · model-written summary
Deep applied potassium generally gave better root growth below 20 cm.
- Taxon
- CottonGossypium hirsutume0
- Treatment
- deep applied Ke0
- Outcome
- root growthe0
- Direction
- bettere0
- Qualifier
- depths > 20 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton root growth at depths > 20 cm was generally better for the treatment receiving the deep applied K”
Claim · model-written summary
Broadcast potassium with subsoiling produced the highest cotton productivity.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- broadcast K in combination with in‐row subsoilinge0
- Outcome
- productivitye0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“broadcast K in combination with in‐row subsoiling resulted in the highest productivity and K accumulation per plant”
t0“Cotton”
t1“Cotton”
Claim · model-written summary
Broadcast potassium with subsoiling produced the highest potassium accumulation per plant.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- broadcast K in combination with in‐row subsoilinge0
- Outcome
- K accumulation per plante0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“broadcast K in combination with in‐row subsoiling resulted in the highest productivity and K accumulation per plant”
t0“Cotton”
t1“Cotton”
Claim · model-written summary
Deep potassium placement was not superior to broadcast application for Alabama cotton production.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- deep placement of K is not superior to broadcast applications of Ke0
- Setting
- Alabamae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for cotton production in Alabama, deep placement of K is not superior to broadcast applications of K”
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