Abstract
A field study was conducted during 2008 and 2009 at El-Khattara farm station, Zagazig Uni-versity, Sharkyia, Egypt (30°36' N, 32°15' E) to determine the effect of three N rates (214, 273, and 333 kg N ha-1), four micronutrients spray treatments (Check, Zn, Mn, and Zn + Mn), and three planting density levels ( 4.76, 5.71, and 6.66 plant m-2) on growth and grain yield of corn (Zea mays, L). The soil was sandy (Entisols) and groundwater was used for irrigation. Response to N was maximized to 214 kg ha-1 without a significant effect on most growth traits and grain yield. Agronomic efficiency of N use for grain yield was negatively related to N rate (r2 = 0.49). Application of micronutrients had no ef-fect on most growth and yield characters except a significant increase by 9.5, 8.7, and 9 % in plant weight (g plant-1), biomass yield (kg m-2), and N agronomic efficiency for biomass yield, respectively. Growth was decreased by in-creasing plant density without affecting harvest index, agronomic efficiency, biomass yield, and grain yield. The application of Zn to the highest maize plant density increased grain yield by 16 % as compared to the check. It is recommended, as predicated by the linear model, that N ferti-gation rate should be around 220 kg ha-1 with plant density of 6.66 plant m-2 accompanied by Zn application for maximum irrigated corn grain yield in sandy soil. Abbreviations: DAS, days after sowing; LA, leaf area; LAI, leaf area index; RPP, relative photosynthetic potential; HI, har-vest index; BW, plant weight g plant-1, GYP, grain yield g plant-1, BYM, biomass yield kg m-2, GYM, grain yield kg m-2, NAE, nitrogen agro-nomic efficiency.
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Claims 10
Claim · model-written summary
Corn response to N was maximized at 214 kg ha-1, with no significant effect on most growth traits and grain yield.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- 214 kg ha-1e0
- Outcome
- growth traits and grain yielde0
- Direction
- no_changeinferrede0
- Value
- 214 kg ha-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Response to N was maximized to 214 kg ha-1 without a significant effect on most growth traits and grain yield”
t0“corn”
Claim · model-written summary
Agronomic efficiency of N use for grain yield was negatively related to N rate (r2 = 0.49) in corn.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- N ratee0
- Outcome
- Agronomic efficiency of N use for grain yielde0
- Direction
- negatively relatede0
- Value
- r2 = 0.49e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Agronomic efficiency of N use for grain yield was negatively related to N rate (r2 = 0.49)”
t0“corn”
Claim · model-written summary
Micronutrient application had no effect on most growth and yield characters of corn.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Application of micronutrientse0
- Outcome
- growth and yield characterse0
- Direction
- no_changeinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of micronutrients had no ef-fect on most growth and yield characters”
t0“corn”
Claim · model-written summary
Micronutrient application significantly increased corn plant weight by 9.5%.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Application of micronutrientse0
- Outcome
- plant weighte0
- Direction
- increasee0
- Value
- 9.5e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of micronutrients had no ef-fect on most growth and yield characters except a significant increase by 9.5, 8.7, and 9 % in plant weight (g plant-1), biomass yield (kg m-2), and N agronomic efficiency for biomass yield, respectively”
t0“corn”
Claim · model-written summary
Micronutrient application significantly increased corn biomass yield by 8.7%.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Application of micronutrientse0
- Outcome
- biomass yielde0
- Direction
- increasee0
- Value
- 8.7e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of micronutrients had no ef-fect on most growth and yield characters except a significant increase by 9.5, 8.7, and 9 % in plant weight (g plant-1), biomass yield (kg m-2), and N agronomic efficiency for biomass yield, respectively”
t0“corn”
Claim · model-written summary
Micronutrient application significantly increased N agronomic efficiency for biomass yield by 9%.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Application of micronutrientse0
- Outcome
- N agronomic efficiency for biomass yielde0
- Direction
- increasee0
- Value
- 9 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of micronutrients had no ef-fect on most growth and yield characters except a significant increase by 9.5, 8.7, and 9 % in plant weight (g plant-1), biomass yield (kg m-2), and N agronomic efficiency for biomass yield, respectively”
t0“corn”
Claim · model-written summary
Increasing plant density decreased growth of corn.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- plant densitye0
- Outcome
- Growthe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth was decreased by in-creasing plant density without affecting harvest index, agronomic efficiency, biomass yield, and grain yield”
t0“corn”
Claim · model-written summary
Increasing plant density did not affect harvest index, agronomic efficiency, biomass yield or grain yield of corn.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- plant densitye0
- Outcome
- harvest index, agronomic efficiency, biomass yield, and grain yielde0
- Direction
- no_changeinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth was decreased by in-creasing plant density without affecting harvest index, agronomic efficiency, biomass yield, and grain yield”
t0“corn”
Claim · model-written summary
Zn applied at the highest maize plant density increased grain yield by 16% compared with the check.
- Treatment
- Zne0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- 16 %e0
- Qualifier
- highest maize plant densitye0
- Comparator
- the checke0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of Zn to the highest maize plant density increased grain yield by 16 % as compared to the check”
Claim · model-written summary
The authors recommend N fertigation of about 220 kg ha-1, plant density of 6.66 plant m-2 and Zn application for maximum irrigated corn grain yield in sandy soil.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- maximum irrigated corn grain yielde0
- Value
- 220 kg ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N ferti-gation rate should be around 220 kg ha-1 with plant density of 6.66 plant m-2 accompanied by Zn application for maximum irrigated corn grain yield in sandy soil”
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