Abstract
Corn ( Zea mays ) biomass accumulation and nutrient uptake by the six-leaf collar (V6) growth stage are low, and therefore, synchronizing nutrient supply with crop demand could potentially minimize nutrient loss and improve nutrient use efficiency. Knowledge of corn’s response to nutrient stress in the early growth stages could inform such nutrient management. Field studies were conducted to assess corn recovery from when no fertilizer application is made until the V6 growth stage, and thereafter, applying fertilizer rates as those in non-stressed conditions. The early season nutrient stress and non-stress conditions received the same amount of nutrients. As the availability of nutrients for plant uptake is largely dependent on soil moisture, corn recovery from the early season nutrient stress was assessed under different soil moisture regimes induced via irrigation scheduling at 50% and 80% field capacity under overhead and subsurface drip irrigation (SSDI) systems. Peanut ( Arachis hypogaea ) was the previous crop under all conditions, and the fields were under cereal rye ( Secale cereale ) cover crop prior to planting corn. At the V6 growth stage, the nutrient concentrations of the early season-stressed crops, except for copper, were above the minimum threshold of sufficiency ranges reported for corn. However, the crops showed poor growth, with biomass accumulation being reduced by over 50% compared to non-stressed crops. Also, the uptake of all nutrients was significantly lower under the early season nutrient stress conditions. The recovery of corn from the early season nutrient stress was low. Compared to non-stress conditions, the early season nutrient stress caused 1.58 Mg ha -1 to 3.4 Mg ha -1 yield reduction. The percent yield reduction under the SSDI system was 37.6-38.2% and that under the overhead irrigation system was 11.7-13%. The high yield reduction from the early season nutrient stress under the SSDI system was because of water stress conditions in the topsoil soil layer. The findings of the study suggest ample nutrient supply in the early season growth stage is critical for corn production, and thus, further studies are recommended to determine the optimum nutrient supply for corn at the initial growth stages.
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Claims 6
Claim · model-written summary
At V6, most nutrients in stressed corn remained above sufficiency thresholds except copper.
- Taxon
- corn
Zea mays subsp. mayst0 - Organ / stage
- V6e2
- Outcome
- nutrient concentrationse0
- Direction
- abovee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nutrient concentrations of the early season-stressed crops, except for copper, were above the minimum threshold of sufficiency ranges reported for corn”
t0“corn”
e2“At the V6 growth stage”
Claim · model-written summary
Early nutrient stress reduced biomass accumulation by more than 50%.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- early season nutrient stresse2
- Outcome
- biomass accumulatione0
- Direction
- reducede0
- Value
- over 50%e0
- Comparator
- non-stressed cropse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“biomass accumulation being reduced by over 50% compared to non-stressed crops”
t0“corn”
e2“Compared to non-stress conditions, the early season nutrient stress”
Claim · model-written summary
All nutrient uptake was significantly lower under early nutrient stress.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- early season nutrient stresse0
- Outcome
- uptake of all nutrientse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“uptake of all nutrients was significantly lower under the early season nutrient stress conditions”
t0“corn”
Claim · model-written summary
Early nutrient stress reduced yield by 1.58 to 3.4 Mg ha -1.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- early season nutrient stresse0
- Outcome
- yielde0
- Direction
- reductione0
- Value
- 1.58 Mg ha -1 to 3.4 Mg ha -1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early season nutrient stress caused 1.58 Mg ha -1 to 3.4 Mg ha -1 yield reduction”
t0“corn”
Claim · model-written summary
Yield reduction under SSDI was 37.6-38.2%.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- yielde0
- Direction
- reductione0
- Value
- 37.6-38.2%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“percent yield reduction under the SSDI system was 37.6-38.2%”
t0“corn”
Claim · model-written summary
Yield reduction under overhead irrigation was 11.7-13%.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- yield reductione2
- Value
- 11.7-13%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under the overhead irrigation system was 11.7-13%”
t0“corn”
e2“The percent yield reduction under the SSDI system”
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