Abstract
Abstract Corn (Zea mays L.) was grown for five consecutive years on Cecil fine sandy loam to measure the effects of irrigation and fertilization on leaf composition, yields, and on the changes in available K in the soil. Plant nutrients consisting of 0, 56, 140, 224 and 280 kg N/ha: 0, 15, 37.5, 60 and 75 kg P/ha, and 0, 28, 70, 112 and 140 kg K/ha were applied in a central composite rotatable design in each of the five years. All plant residue was removed each year when the corn was harvested and the plots were seeded without fertilization to rye each year as a cover crop. One‐half of the experiment was irrigated when there was a 50% depletion of available soil moisture in the 0‐ to 45‐cm soil depth. The available K content of the 0‐ to 15‐cm soil depth was not significantly affected by irrigation but decreased with cropping at all rates of applied K. Decreases in available K were less pronounced with increased rates of applied K. The available K content of the 90‐ to 120‐cm depth was similar where 0 and 140 kg K/ha were applied. Irrigation, as compared with no irrigation, decreased the level of available K throughout the profile on uncropped and unfertilized plots. Irrigation increased the N content of corn leaves but did not increase the P and K contents. Corn responded to N during the last four years, to K only in the fifth year and there was no response to P fertilization.
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Claims 10
Claim · model-written summary
Available soil K declined with cropping at all K application rates.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The available K content of the 0‐ to 15‐cm soil depth was not significantly affected by irrigation but decreased with cropping at all rates of applied K”
t0“corn”
Claim · model-written summary
Higher applied K rates lessened the decline in available soil K.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- increased rates of applied Ke0
- Outcome
- Decreases in available Ke0
- Direction
- less pronouncede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreases in available K were less pronounced with increased rates of applied K”
t0“corn”
Claim · model-written summary
Irrigation did not significantly affect available K at 0 to 15 cm.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- irrigatione0
- Outcome
- available K contente0
Not reportedOrgan / stageComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The available K content of the 0‐ to 15‐cm soil depth was not significantly affected by irrigation”
t0“corn”
Claim · model-written summary
Available K at 90 to 120 cm was similar under 0 and 140 kg K/ha.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- 140 kg K/hae0
- Outcome
- available K contente0
- Direction
- similare0
- Comparator
- 0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The available K content of the 90‐ to 120‐cm depth was similar where 0 and 140 kg K/ha were applied”
t0“corn”
Claim · model-written summary
Irrigation lowered available K throughout the soil profile on uncropped, unfertilized plots.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Irrigatione0
- Outcome
- available Ke0
- Direction
- decreasede0
- Qualifier
- uncropped and unfertilized plotse0
- Comparator
- no irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation, as compared with no irrigation, decreased the level of available K throughout the profile on uncropped and unfertilized plots”
t0“corn”
Claim · model-written summary
Irrigation increased N content of corn leaves.
- Taxon
- cornZea mays subsp. mayse0
- Organ / stage
- leavese0
- Treatment
- Irrigatione0
- Outcome
- N content of corn leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation increased the N content of corn leaves”
Claim · model-written summary
Irrigation did not increase P and K contents of corn leaves.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Irrigatione0
- Outcome
- P and K contentse0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation increased the N content of corn leaves but did not increase the P and K contents”
Claim · model-written summary
Corn responded to N in the last four years.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- Ne0
- Outcome
- responded to Ne0
- Qualifier
- last four yearse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn responded to N during the last four years”
Claim · model-written summary
Corn responded to K only in the fifth year.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- Ke0
- Outcome
- responded to N during the last four years, to K only in the fifth yeare0
- Qualifier
- fifth yeare0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn responded to N during the last four years, to K only in the fifth year”
Claim · model-written summary
Corn showed no response to P fertilization.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- P fertilizatione0
- Outcome
- response to P fertilizatione0
- Direction
- no responsee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn responded to N during the last four years, to K only in the fifth year and there was no response to P fertilization”
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