Abstract
Abstract Six greenhouse pot experiments were conducted in which yield and nutrient uptake responses of corn (Zea mays L.) or tall fescue (Festuca arundinacea Shreb) to N, P, K, lime, or temperature variables were measured. This paper describes yield—NO3‐N and total N concentration trends in these experiments. Crop concentrations of total N and NO3‐N during early growth increased consistently with amount of applied N. These concentrations usually decreased (by dilution and assimilation) with time of growth and yield response to other growth‐limiting nutrients and other factors. Concentrations of K also increased in corn with amount of applied K, and high K was associated with higher concentrations of NO3‐N during early growth in some experiments. This was usually true only for early crop growth periods during which rates of nutrient uptake exceeded growth rate. High K concentrations may have retarded growth and NO3‐N reduction and assimilation.
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Claims 6
Claim · model-written summary
Applied N increased early total N and nitrate N concentrations in corn or tall fescue.
Not reportedComparator
Verbatim
e0“Crop concentrations of total N and NO3‐N during early growth increased consistently with amount of applied N.”
Claim · model-written summary
Total N and nitrate N concentrations usually decreased with growth time and yield responses to other limiting factors.
Not reportedTaxon
Verbatim
e0“These concentrations usually decreased (by dilution and assimilation) with time of growth and yield response to other growth‐limiting nutrients and other factors.”
Claim · model-written summary
Applied K increased K concentrations in corn.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- applied Ke0
- Outcome
- Concentrations of Ke0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of K also increased in corn with amount of applied K”
Claim · model-written summary
High K was associated with higher early nitrate N concentrations in corn in some experiments.
Not reportedTaxon
Verbatim
e0“high K was associated with higher concentrations of NO3‐N during early growth in some experiments”
Claim · model-written summary
The high K association usually occurred only when nutrient uptake exceeded growth.
Verbatim
e0“This was usually true only for early crop growth periods during which rates of nutrient uptake exceeded growth rate.”
Claim · model-written summary
High K concentrations may have retarded growth and nitrate reduction and assimilation.
Not reportedTaxon
Verbatim
e0“High K concentrations may have retarded growth and NO3‐N reduction and assimilation.”