Abstract
Corn (Zea mays cv Prisma) was cropped consecutively for 5 years under the common Mediterranean management practice of plentiful fertilisation and irrigation. The nutritional status of the crop was studied over 5 years of monocropping at three different stages of growth: plantlets of 15 cm height, early tasseling and mature plants. The fertilisation was applied at both one of the highest rates used in SW Spain, 1000 kg ha-1 of a 15(N)–15(P2O5)–15(K2O) fertiliser, plus two top-dressings of urea each of 400 kg ha-1, and the same fertiliser but at one third of this rate. The nutritional status of the crop, and yield, decreased over the study. Concentrations of N and P declined along the years, this effect being most evident during early growth in the case of P and in mature plants in the case of N. Zinc concentration also declined over the first 4 years. DRIS approach also reflected a decrease in the nutritional status of the crop. The high rate of fertilisation did not alleviate the decline in nutritional status, which shows that its routine application is not justified under Mediterranean conditions since it hardly provokes any crop response and increases the risk of environmental pollution. © 1997 SCI.
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Claims 8
Claim · model-written summary
Corn nutritional status declined over five years of monocropping.
- Taxon
- Corn
Zea mays subsp. mayst0 - Outcome
- nutritional statuse0
- Direction
- decreasede0
- Qualifier
- over the studye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nutritional status of the crop, and yield, decreased over the study”
t0“Corn”
Claim · model-written summary
Corn yield declined over five years of monocropping.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- yielde0
- Direction
- decreasede0
- Qualifier
- over the studye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nutritional status of the crop, and yield, decreased over the study”
t0“Corn”
Claim · model-written summary
Corn N concentration declined across years, most evidently in mature plants.
- Taxon
- CornZea mays subsp. mayst0
- Organ / stage
- mature plantse0
- Outcome
- Concentrations of Ne0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of N and P declined along the years, this effect being most evident during early growth in the case of P and in mature plants in the case of N”
t0“Corn”
Claim · model-written summary
Corn P concentration declined across years, most evidently during early growth.
- Taxon
- CornZea mays subsp. mayst0
- Organ / stage
- early growthe0
- Outcome
- Concentrations of N and Pe0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of N and P declined along the years, this effect being most evident during early growth in the case of P and in mature plants in the case of N”
t0“Corn”
Claim · model-written summary
Corn zinc concentration declined during the first four years.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- Zinc concentratione0
- Direction
- declinede0
- Qualifier
- first 4 yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zinc concentration also declined over the first 4 years”
t0“Corn”
Claim · model-written summary
DRIS indicated declining corn nutritional status.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- nutritional statuse0
- Direction
- decreasee0
- Comparator
- DRIS approache0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DRIS approach also reflected a decrease in the nutritional status of the crop”
t0“Corn”
Claim · model-written summary
High fertilization did not alleviate declining nutritional status.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- high rate of fertilisatione0
- Outcome
- nutritional statuse0
- Direction
- did not alleviatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high rate of fertilisation did not alleviate the decline in nutritional status”
t0“Corn”
Claim · model-written summary
Routine high fertilization is not justified under Mediterranean conditions.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- routine application is not justifiede0
- Setting
- Mediterranean conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its routine application is not justified under Mediterranean conditions since it hardly provokes any crop response and increases the risk of environmental pollution”
t0“Corn”