Abstract
Abstract Greenhouse pot experiments were conducted to compare responses of corn ( Zea mays L.) and snap beans ( Phaseolus vulgaris L.) to 0 to 1,600 mg of K/pot as KNO 3 , KCl, and K 2 SO 4 on K‐deficient soils (3 kg of soil/pot). Marked responses were obtained to applied K, which were similar among sources, except for a toxic salt effect of 1,600 mg of K as KCl. Marked reciprocal K‐N, K‐P, K‐Ca, and K‐Mg relationships with yield response to rates of applied K were attributed to both dilution and ion antagonism. The latter was most pronounced at higher K rates giving little or no additional yield response and resulting in decreased Ca, Mg, or P uptake. There was a close relationship between total N and total cation concentrations in corn leaves but not in bean leaves. This difference is attributed to absorption of much of the N as NO 3 ‐N by corn and as biologically fixed NH 2 ‐N by snap beans.
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Claims 6
Claim · model-written summary
Applied potassium produced marked responses in corn and snap beans, similar across sources.
Not reportedTaxonComparatorDirection
Verbatim
e0“Marked responses were obtained to applied K, which were similar among sources”
t0“Corn and Snap Beans”
Claim · model-written summary
The highest KCl rate caused a toxic salt effect.
Not reportedComparatorDirection
Verbatim
e0“a toxic salt effect of 1,600 mg of K as KCl”
t0“Corn and Snap Beans”
Claim · model-written summary
Higher K rates produced little or no additional yield response.
- Taxon
- Corn and Snap Beanst0
- Treatment
- higher K ratese0
- Outcome
- yield responsee0
- Direction
- little or no additionale0
Not reportedComparator
Verbatim
e0“higher K rates giving little or no additional yield response”
t0“Corn and Snap Beans”
Claim · model-written summary
Higher K rates decreased calcium, magnesium, or phosphorus uptake.
Not reportedComparator
Verbatim
e0“higher K rates giving little or no additional yield response and resulting in decreased Ca, Mg, or P uptake”
t0“Corn and Snap Beans”
Claim · model-written summary
Total nitrogen and total cation concentrations were closely related in corn leaves.
- Taxon
- corn
Zea mays subsp. mayse0 - Organ / stage
- leavese0
- Outcome
- total N and total cation concentrationse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a close relationship between total N and total cation concentrations in corn leaves”
Claim · model-written summary
The total nitrogen–cation relationship was absent in bean leaves.
Not reportedDirection
Verbatim
e0“but not in bean leaves”
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