EFFECT OF NITROGEN FERTIGATION LEVELS AND CHELATED CAL-CIUM FOLIAR APPLICATION ON THE PRODUCTIVITY OF SWEET CORN

Abstract

This study was conducted in a sandy soil at Ali Mubarak Village Research Farm, South Tahrir Horticulture Research Station, Behaira Gover-norate, during the two successive seasons of 2002/2003 and 2003/2004 on sweet corn Jubilee hybrid. The study aimed to determine the best treatments of nitrogen fertigation level and chelat-ed calcium foliar application on the productivity and quality of sweet corn. The obtained results indicated that increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed. and (or) chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA) led to increasing the vegetative growth (leaf area, plant height, fresh and dry weight), chemical composition (total chlorophyll, nitrogen, phosphorus, potassium and calcium in leaves) and yield characters (ear length, ear diame-ter, weight of 1000 seed, unhusked ear, husked ear and total yield) The promising treatment was 160 kg N/Fed. combined with 1000 ppm Ca EDTA under similar prevailing conditions of the present studying in a sandy soil

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Claims 9

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed. increased leaf area, plant height, fresh and dry weight in sweet corn.

Taxon: SWEET CORNt0
Treatment: increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed.e0
Outcome: leaf area, plant height, fresh and dry weighte0
Direction: increasinge0

Not reportedComparator

Verbatim

e0
“The obtained results indicated that increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed. and (or) chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA) led to increasing the vegetative growth (leaf area, plant height, fresh and dry weight), chemical composition (total chlorophyll, nitrogen, phosphorus, potassium and calcium in leaves) and yield characters (ear length, ear diame-ter, weight of 1000 seed, unhusked ear, husked ear and total yield)”
✓ located verbatim in the source · abstract, characters 403–884 · show in text ↑

t0
“SWEET CORN”
✓ located verbatim in the source · title, characters 102–112 · show in text ↑

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA) increased leaf area, plant height, fresh and dry weight in sweet corn.

Taxon: SWEET CORNt0
Treatment: chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA)e0
Outcome: leaf area, plant height, fresh and dry weighte0
Direction: increasinge0

Not reportedComparator

Verbatim

e0
“The obtained results indicated that increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed. and (or) chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA) led to increasing the vegetative growth (leaf area, plant height, fresh and dry weight), chemical composition (total chlorophyll, nitrogen, phosphorus, potassium and calcium in leaves) and yield characters (ear length, ear diame-ter, weight of 1000 seed, unhusked ear, husked ear and total yield)”
✓ located verbatim in the source · abstract, characters 403–884 · show in text ↑

t0
“SWEET CORN”
✓ located verbatim in the source · title, characters 102–112 · show in text ↑

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed. increased total chlorophyll, nitrogen, phosphorus, potassium and calcium in leaves in sweet corn.

Taxon: SWEET CORNt0
Treatment: increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed.e0
Outcome: total chlorophyll, nitrogen, phosphorus, potassium and calcium in leavese0
Direction: increasinge0

Not reportedComparator

Verbatim

e0
“The obtained results indicated that increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed. and (or) chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA) led to increasing the vegetative growth (leaf area, plant height, fresh and dry weight), chemical composition (total chlorophyll, nitrogen, phosphorus, potassium and calcium in leaves) and yield characters (ear length, ear diame-ter, weight of 1000 seed, unhusked ear, husked ear and total yield)”
✓ located verbatim in the source · abstract, characters 403–884 · show in text ↑

t0
“SWEET CORN”
✓ located verbatim in the source · title, characters 102–112 · show in text ↑

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA) increased total chlorophyll, nitrogen, phosphorus, potassium and calcium in leaves in sweet corn.

Taxon: SWEET CORNt0
Treatment: chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA)e0
Outcome: total chlorophyll, nitrogen, phosphorus, potassium and calcium in leavese0
Direction: increasinge0

Not reportedComparator

Verbatim

e0
“The obtained results indicated that increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed. and (or) chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA) led to increasing the vegetative growth (leaf area, plant height, fresh and dry weight), chemical composition (total chlorophyll, nitrogen, phosphorus, potassium and calcium in leaves) and yield characters (ear length, ear diame-ter, weight of 1000 seed, unhusked ear, husked ear and total yield)”
✓ located verbatim in the source · abstract, characters 403–884 · show in text ↑

t0
“SWEET CORN”
✓ located verbatim in the source · title, characters 102–112 · show in text ↑

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed. increased ear length, ear diame-ter, weight of 1000 seed in sweet corn.

Taxon: SWEET CORNt0
Treatment: increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed.e0
Outcome: ear length, ear diame-ter, weight of 1000 seede0
Direction: increasinge0

Not reportedComparator

Verbatim

e0
“The obtained results indicated that increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed. and (or) chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA) led to increasing the vegetative growth (leaf area, plant height, fresh and dry weight), chemical composition (total chlorophyll, nitrogen, phosphorus, potassium and calcium in leaves) and yield characters (ear length, ear diame-ter, weight of 1000 seed, unhusked ear, husked ear and total yield)”
✓ located verbatim in the source · abstract, characters 403–884 · show in text ↑

t0
“SWEET CORN”
✓ located verbatim in the source · title, characters 102–112 · show in text ↑

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA) increased ear length, ear diame-ter, weight of 1000 seed in sweet corn.

Taxon: SWEET CORNt0
Treatment: chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA)e0
Outcome: ear length, ear diame-ter, weight of 1000 seede0
Direction: increasinge0

Not reportedComparator

Verbatim

e0
“The obtained results indicated that increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed. and (or) chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA) led to increasing the vegetative growth (leaf area, plant height, fresh and dry weight), chemical composition (total chlorophyll, nitrogen, phosphorus, potassium and calcium in leaves) and yield characters (ear length, ear diame-ter, weight of 1000 seed, unhusked ear, husked ear and total yield)”
✓ located verbatim in the source · abstract, characters 403–884 · show in text ↑

t0
“SWEET CORN”
✓ located verbatim in the source · title, characters 102–112 · show in text ↑

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed. increased unhusked ear, husked ear and total yield in sweet corn.

Taxon: SWEET CORNt0
Treatment: increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed.e0
Outcome: unhusked ear, husked ear and total yielde0
Direction: increasinge0

Not reportedComparator

Verbatim

e0
“The obtained results indicated that increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed. and (or) chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA) led to increasing the vegetative growth (leaf area, plant height, fresh and dry weight), chemical composition (total chlorophyll, nitrogen, phosphorus, potassium and calcium in leaves) and yield characters (ear length, ear diame-ter, weight of 1000 seed, unhusked ear, husked ear and total yield)”
✓ located verbatim in the source · abstract, characters 403–884 · show in text ↑

t0
“SWEET CORN”
✓ located verbatim in the source · title, characters 102–112 · show in text ↑

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA) increased unhusked ear, husked ear and total yield in sweet corn.

Taxon: SWEET CORNt0
Treatment: chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA)e0
Outcome: unhusked ear, husked ear and total yielde0
Direction: increasinge0

Not reportedComparator

Verbatim

e0
“The obtained results indicated that increasing nitrogen fertigation level (100, 120, 140 to 160) kg N/fed. and (or) chelated calcium (12% Ca++) concentration (500 and 1000 ppm Ca EDTA) led to increasing the vegetative growth (leaf area, plant height, fresh and dry weight), chemical composition (total chlorophyll, nitrogen, phosphorus, potassium and calcium in leaves) and yield characters (ear length, ear diame-ter, weight of 1000 seed, unhusked ear, husked ear and total yield)”
✓ located verbatim in the source · abstract, characters 403–884 · show in text ↑

t0
“SWEET CORN”
✓ located verbatim in the source · title, characters 102–112 · show in text ↑

Recommendationauthor interpretationoriginal resultpositivebasis n/a

Claim · model-written summary

The authors recommend 160 kg N/Fed. with 1000 ppm Ca EDTA for sweet corn in sandy soil.

Taxon: SWEET CORNt0
Treatment: 160 kg N/Fed. combined with 1000 ppm Ca EDTAe0
Outcome: promising treatmente0
Setting: sandy soile0

Verbatim

e0
“The promising treatment was 160 kg N/Fed. combined with 1000 ppm Ca EDTA under similar prevailing conditions of the present studying in a sandy soil”
✓ located verbatim in the source · abstract, characters 885–1033 · show in text ↑

t0
“SWEET CORN”
✓ located verbatim in the source · title, characters 102–112 · show in text ↑

calcium atom · yield · Zea mays (maize)Results differ

19 papers: 14 positive, 5 negative or no effect

13 papers in the same direction as this paper · 5 in the opposite direction

negative
Using Ca(NO3)2 rather than NH4NO3 as N source reduced sweet corn height and yield.
Sweet Corn Growth Responses and Leaf Concentrations as Affected by Lime Types and Fertilizer Treatments in a Five-year Study · 1984 · compared with NH 4 NO 3
Opposite directionCited by this paper
no effect
Sweet corn showed no yield response for 2 years to spring-applied N from Ca(NO3)2, urea, and urea plus nitrapyrin on a loam soil high in organic matter and cation exchange capacity.
Effect of Nitrogen Source and Nitrapyrin on Sweet Corn1 · 1979
Opposite direction
no effect
Leaf area, dry matter and root length did not differ statistically among the aluminum ratio treatments.
Growth of maize seedlings (Zea mays L. var. Porva) in nutrient solution with low (Ca+Mg+K)/Al ratio. · 2009 · compared with treatments
Opposite direction

15 papers more in this group

See all 19 papers →

calcium atom · growth · Zea mays (maize)Results differ

33 papers: 25 positive, 8 negative or no effect

24 papers in the same direction as this paper · 8 in the opposite direction

negative
Maize root elongation was inhibited under NaCl with added calcium.
Hardening of root cell walls: a growth inhibitory response to salinity stress · 1994
Opposite direction
no effect
Exchangeable Ca/Mg ratios did not substantially affect corn root and shoot growth.
GYPSUM AMENDMENT AND EXCHANGEABLE CALCIUM AND MAGNESIUM EFFECTS ON PLANT NUTRITION UNDER CONDITIONS OF INTENSIVE NUTRIENT EXTRACTION · 2008
Opposite direction
no effect
Calcium level did not change corn pollen germination initiation time.
THE MALE GAMETOPHYTE OF ZEA MAYS L.: III. THE INFLUENCE OF TEMPERATURE AND CALCIUM ON POLLEN GERMINATION AND TUBE GROWTH · 1967
Opposite direction

29 papers more in this group

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calcium atom · physiology: pigments · Zea mays (maize)Positive and negative results

6 papers: 4 positive, 2 negative or no effect

3 papers in the same direction as this paper · 2 in the opposite direction

no effect
Ca starvation did not significantly change pigment content.
Influence of short-term macronutrient deprivation in maize on photosynthetic characteristics, transpiration and pigment content · 2019 · compared with control
Opposite directionAbout lacking this nutrient, so it counts the other way round
negative
Element deficiencies decreased chlorophyll and soluble proline content.
Effect of Lacking Different Chemical Elements on Maize Leaf's Lipid Peroxidation and Protective Enzyme · 2009
Opposite direction
positive
Withholding calcium reduced leaf chlorophyll a, b and total chlorophyll.
Effects of Ca on growth and some physiological characteristics of maize under Cd stress · 2001
Same directionAbout lacking this nutrient, so it counts the other way round

2 papers more in this group

See all 6 papers →

nitrogen · physiology: pigments · Zea mays (maize)Positive and negative results

126 papers: 112 positive, 14 negative or no effect

111 papers in the same direction as this paper · 13 in the opposite direction · 1 reporting no difference from an alternative

negative
Low nitrogen significantly decreased leaf chlorophyll content.
Effect of low-nitrogen stress on photosynthesis and chlorophyll fluorescence characteristics of maize cultivars with different low-nitrogen tolerances · 2019
Opposite direction
negative
Ammonium reduced maize chlorophyll accumulation.
Nitrate and Ammonium Affect the Overall Maize Response to Nitrogen Availability by Triggering Specific and Common Transcriptional Signatures in Roots · 2020
Opposite direction
no effect
The five selected diazotrophs had no significant field effect on germination, grain yield, dry weight, plant height or leaf chlorophyll in 2010/2011.
Effects of Selected Diazotrophs on Maize Growth · 2016
Opposite directionAbout lacking this nutrient, so it counts the other way round

122 papers more in this group

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fertilization · physiology: pigments · Zea mays (maize)Positive and negative results

171 papers: 157 positive, 14 negative or no effect

156 papers in the same direction as this paper · 11 in the opposite direction · 3 reporting no difference from an alternative

positive
Increasing N fertilizer to 120 kg N per fed significantly increased chlorophyll content.
THE YIELD AND YIELD COMPONENTS OF MAIZE AS INFLUENCED BY NITROGEN, ZINC AND BORON FERTIL- IZATION · 2003
Same directionCited by this paper
no effect
No consistent significant differences in agronomic parameters were found among fertilizer treatments.
Utility of stabilized nitrogen fertilizers to reduce nitrate leaching under optimal management practices · 2020
Opposite direction
no effect
Phosphate starter fertilization did not significantly alter fatty acid, carotenoid and tocochromanol concentrations in corn kernels.
Location and Variety but Not Phosphate Starter Fertilization Influence the Profiles of Fatty Acids, Carotenoids, and Tocochromanols in Kernels of Modern Corn (Zea mays L.) Hybrids Cultivated in Germany · 2021 · compared with without starter fertilizer
Opposite direction

167 papers more in this group

See all 171 papers →

nitrogen · growth · Zea mays (maize)Positive and negative results

748 papers: 619 positive, 129 negative or no effect

618 papers in the same direction as this paper · 115 in the opposite direction · 14 reporting no difference from an alternative

negative
Under nitrogen starvation, atg12 seedling growth was severely arrested.
Autophagic Recycling Plays a Central Role in Maize Nitrogen Remobilization · 2015
Opposite direction
no effect
WDRVI, NDVI and crop height showed no significant response to extra nitrogen at the economic optimum rate.
Analysis of Vegetation Indices to Determine Nitrogen Application and Yield Prediction in Maize (Zea mays L.) from a Standard UAV Service · 2016 · compared with economic optimum rate of fertilization
Opposite direction
negative
Nitrogen limitation reduced shoot growth.
Adaptation of the Photosynthetic Apparatus in Maize Leaves as a Result of Nitrogen Limitation · 1990
Opposite direction

744 papers more in this group

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fertilization · growth · Zea mays (maize)Positive and negative results

1,365 papers: 1,196 positive, 169 negative or no effect

1,195 papers in the same direction as this paper · 149 in the opposite direction · 20 reporting no difference from an alternative

positive
Higher nitrogen rates produced larger plant height and ear diameter, usually without significant treatment differences.
Response of Selected Sweet Corn Cultivars to Nitrogen Fertilization · 1999
Same directionCited by this paper
no effect
Foliar fertilization did not improve maize growth under short-term drought or salt stress.
Effect of foliar fertilization application on the growth and mineral nutrient content of maize seedlings under drought and salinity · 2008
Opposite direction
no effect
Starter fertilizer did not increase corn height.
Corn Yield is Equal in Conventional, Reduced, and No Tillage after 20 Years · 1996
Opposite direction

1,361 papers more in this group

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nitrogen · yield · Zea mays (maize)Positive and negative results

2,185 papers: 1,906 positive, 279 negative or no effect

1,905 papers in the same direction as this paper · 234 in the opposite direction · 45 reporting no difference from an alternative

positive
Northern Belle yields increased by 36% under 56 kg/ha each of N and P banded, compared with the check.
Sweet Corn Growth Responses and Leaf Concentrations as Affected by Lime Types and Fertilizer Treatments in a Five-year Study · 1984 · compared with the check
Same directionCited by this paper
positive
Higher nitrogen rate increased sweet corn yield.
Nitrogen effect on yield and kernel protein content of sweet corn grown on sandy soils · 1983
Same directionCited by this paper
negative
Low nitrogen decreased maize grain yield.
Within-Leaf Nitrogen Allocation in Adaptation to Low Nitrogen Supply in Maize during Grain-Filling Stage · 2016
Opposite direction

2,181 papers more in this group

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8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.

Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.

Abstract

Claims 9

The same questions in other papers

calcium atom · yield · Zea mays (maize)Results differ

calcium atom · growth · Zea mays (maize)Results differ

calcium atom · physiology: pigments · Zea mays (maize)Positive and negative results

nitrogen · physiology: pigments · Zea mays (maize)Positive and negative results

fertilization · physiology: pigments · Zea mays (maize)Positive and negative results

nitrogen · growth · Zea mays (maize)Positive and negative results

fertilization · growth · Zea mays (maize)Positive and negative results

nitrogen · yield · Zea mays (maize)Positive and negative results