Abstract
Corn performance is often unchanged by modifying the potassium fertilizer application timing, especially when soil K is not a limiting factor. Consequently, there is no literature reporting K timing on K-fertilizer contribution (or use) in high-yielding corn fields. We evaluated corn performance and K-fertilizer use based on timings of K-fertilizer application in the oat-corn sequence at subtropical environment with highly weathered soils. Additionally, we propose a timing strategy to ensure high corn use of fertilizer. The crop sequence study was conducted in two field experiments to investigate corn performance with respect to K-leaf, K uptake, and yield. Additionally, we evaluated K-fertilizer use by rubidium as potassium derived from fertilizer and potassium use efficiency. Application timings were two before and three during corn growth and development. Timings did not change corn performance even for late K application, and this was attributed mainly to soil K sufficiency levels. Corn K-fertilizer use, on the other hand, was different and higher for timings before (versus during) corn growth and development. Importantly, timing of K application ∼22 days before corn sowing improved corn K-fertilizer use approximately 2-fold versus the two late timings. Timings in oat or during corn sowing were identical for corn K-fertilizer use. We link our rainfall data with literature K-fertilizer movement (positional aspect), and the corn ability to acquire it. Application of K at 3-weeks before corn sowing constituted the optimal timing for fertilizer supply. This finding will assist farmers in large-scale areas to manage K-fertilizer application to promote higher efficiency.
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Claims 5
Claim · model-written summary
Application timing did not change corn performance.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- Timingse0
- Outcome
- corn performancee0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Timings did not change corn performance even for late K application”
t0“Potassium application timing to improve corn K-fertilizer use in the oat-corn sequence: a tracer study for high yielding corn”
Claim · model-written summary
Corn fertilizer potassium use was higher for applications before growth than during growth.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- timings beforee0
- Outcome
- Corn K-fertilizer usee0
- Direction
- highere0
- Comparator
- duringe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn K-fertilizer use, on the other hand, was different and higher for timings before (versus during) corn growth and development”
Claim · model-written summary
Applying potassium about 22 days before sowing approximately doubled corn fertilizer use versus late timings.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- K application ∼22 days before corn sowinge0
- Outcome
- corn K-fertilizer usee0
- Direction
- improvede0
- Value
- approximately 2-folde0
- Comparator
- the two late timingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“timing of K application ∼22 days before corn sowing improved corn K-fertilizer use approximately 2-fold versus the two late timings”
Claim · model-written summary
Oat timing and corn sowing timing had identical corn fertilizer potassium use.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Timings in oate0
- Outcome
- corn K-fertilizer usee0
- Direction
- identicale0
- Comparator
- during corn sowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Timings in oat or during corn sowing were identical for corn K-fertilizer use”
Claim · model-written summary
The authors identified three weeks before sowing as optimal potassium supply timing.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Application of K at 3-weeks before corn sowinge0
- Outcome
- optimal timing for fertilizer supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of K at 3-weeks before corn sowing constituted the optimal timing for fertilizer supply”
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