Abstract
Abstract Field‐grown maize ( Zea mays L.) plants (hybrid B73 X Mo17) were sprayed with 15 N‐enriched urea to determine recovery and subsequent distribution within the plant. Plants were sprayed with 15 N enriched urea at 7 days pre‐ (treatment 1) and post‐anthesis (treatment 2) to provide a total of 22.3 kg N ha −1 (350 mg N plant −1 ). Unsprayed plants were used as controls. Plots were located on Flannigan silt loam (fine, montmorillontic mesic Aquic Argiudoll) at stands equivalent to 63 800 plants ha −1 . Timing of spray treatment had no effect on grain yield, stover weight, visible leaf senescence, or N content of the plant parts, relative to controls. About one‐third (29% in treatment 1, 30% in treatment 2) of the foliarly applied urea was absorbed and incorporated by the plant. The amounts and distribution patterns within plant parts of foliarly applied N and of total N (N derived from soil uptake and foliarly applied urea N) indicated that leaves were the organs of uptake, and that the stalk served as a conduit for passage of urea‐derived N from leaves to the ear rather than as a storage organ for foliarly applied N. The greater initial rates of loss and the final extent of depletion of N from leaves was greater for foliarly applied N than for total N. This indicated that the foliarly applied N was incorporated into a different pool of N than had been formed earlier by unenriched soil derived N. This observation provides possible explanation for the failure of foliar N applications to increase grain yields of maize.
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Claims 8
Claim · model-written summary
Spray timing did not affect grain yield, stover weight or senescence relative to controls.
- Treatment
- Timing of spray treatmente0
- Outcome
- grain yield, stover weight, visible leaf senescencee0
- Direction
- no effecte0
- Comparator
- controlse0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Timing of spray treatment had no effect on grain yield, stover weight, visible leaf senescence, or N content of the plant parts, relative to controls”
t0“maize”
Claim · model-written summary
Spray timing did not affect plant-part nitrogen content relative to controls.
- Treatment
- Timing of spray treatmente0
- Outcome
- N content of the plant partse0
- Direction
- no effecte0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Timing of spray treatment had no effect on grain yield, stover weight, visible leaf senescence, or N content of the plant parts, relative to controls”
t0“maize”
Claim · model-written summary
Maize absorbed 29% of foliar urea applied before anthesis.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“About one‐third (29% in treatment 1, 30% in treatment 2) of the foliarly applied urea was absorbed and incorporated by the plant”
t0“maize”
Claim · model-written summary
Maize absorbed 30% of foliar urea applied after anthesis.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“About one‐third (29% in treatment 1, 30% in treatment 2) of the foliarly applied urea was absorbed and incorporated by the plant”
t0“maize”
Claim · model-written summary
Leaves were the organs of foliar nitrogen uptake.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaves were the organs of uptake”
t0“maize”
Claim · model-written summary
The stalk served as a conduit for urea-derived nitrogen to the ear rather than a storage organ.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the stalk served as a conduit for passage of urea‐derived N from leaves to the ear rather than as a storage organ for foliarly applied N”
t0“maize”
Claim · model-written summary
Foliar nitrogen was lost and depleted from leaves more rapidly than total nitrogen.
- Outcome
- initial rates of loss and the final extent of depletion of N from leavese0
- Direction
- greatere0
- Comparator
- total Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The greater initial rates of loss and the final extent of depletion of N from leaves was greater for foliarly applied N than for total N”
t0“maize”
Claim · model-written summary
Foliar nitrogen apparently entered a different pool from earlier soil-derived nitrogen.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the foliarly applied N was incorporated into a different pool of N than had been formed earlier by unenriched soil derived N”
t0“maize”
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