Abstract
Actual yields of maize harvested by farmers are at level much below attainable yield potential of currently cultivated varieties. Among many growth factors zinc was recognized as one of main limiting factors of maize crop growth and yielding. This hypothesis has been verified within a three-year field study, where zinc fertilizer was applied to maize plants at the 5th leaf stage. Maize crop responded significantly to zinc foliar application in two of three years of study. The optimal rate of zinc foliar spray for achieving significant grain yield response was in the range from 1.0 to 1.5 kg Zn/ha. Grain yield increase was circa 18% (mean of three years) as compared to the treatment fertilized only with NPK. Plants fertilized with 1.0 kg Zn/ha significantly increased both total N uptake and grain yield. Yield forming effect of zinc fertilizer revealed via improvement of yield structure elements. The number of kernels per plant showed the highest response (+17.8% as compared to the NPK plot) and simultaneously the highest dependence on N uptake (R2 = 0.79). For this particular zinc treatment, however, the length of cob can also be applied as a component of yield structure significantly shaping the final grain yield.
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Claims 8
Claim · model-written summary
Maize grain yield responded significantly to zinc foliar application in two of three study years.
Zea maysNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“verified within a three-year field study, where zinc fertilizer was applied to maize plants at the 5th leaf stage”
e1“Maize crop responded significantly to zinc foliar application in two of three years of study”
t0“grain yield of maize”
Claim · model-written summary
The optimal zinc foliar spray rate for a significant grain yield response in maize was 1.0 to 1.5 kg Zn/ha.
- Treatment
- zinc foliar spraye1
- Outcome
- grain yield responsee1
- Value
- 1.0 to 1.5 kg Zn/hae1
- Setting
- three-year field studye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“verified within a three-year field study, where zinc fertilizer was applied to maize plants at the 5th leaf stage”
e1“The optimal rate of zinc foliar spray for achieving significant grain yield response was in the range from 1.0 to 1.5 kg Zn/ha”
Claim · model-written summary
Zinc fertilizer increased maize grain yield by circa 18 % (mean of three years) compared with NPK fertilization alone.
- Treatment
- zinc fertilizere0
- Outcome
- Grain yielde1
- Direction
- increasee1
- Value
- circa 18%e1
- Comparator
- treatment fertilized only with NPKe1
- Setting
- three-year field studye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“verified within a three-year field study, where zinc fertilizer was applied to maize plants at the 5th leaf stage”
e1“Grain yield increase was circa 18% (mean of three years) as compared to the treatment fertilized only with NPK”
Claim · model-written summary
Zinc fertilizer at 1.0 kg Zn/ha significantly increased total N uptake and grain yield of maize.
- Treatment
- 1.0 kg Zn/hae1
- Outcome
- total N uptake and grain yielde1
- Direction
- significantly increasede1
- Setting
- three-year field studye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“verified within a three-year field study, where zinc fertilizer was applied to maize plants at the 5th leaf stage”
e1“Plants fertilized with 1.0 kg Zn/ha significantly increased both total N uptake and grain yield”
Claim · model-written summary
Zinc treatment increased the number of kernels per maize plant by 17.8 % compared with the NPK plot.
- Treatment
- zinc fertilizere0
- Outcome
- number of kernels per plante1
- Direction
- higherinferrede1
- Value
- +17.8%e1
- Comparator
- NPK plote1
- Setting
- three-year field studye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“verified within a three-year field study, where zinc fertilizer was applied to maize plants at the 5th leaf stage”
e1“The number of kernels per plant showed the highest response (+17.8% as compared to the NPK plot)”
Claim · model-written summary
Kernels per plant showed the highest dependence on N uptake among the yield components (R2 = 0.79).
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“verified within a three-year field study, where zinc fertilizer was applied to maize plants at the 5th leaf stage”
e1“simultaneously the highest dependence on N uptake (R2 = 0.79)”
Claim · model-written summary
The length of cob significantly shaped the final grain yield of maize under the zinc treatment.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“verified within a three-year field study, where zinc fertilizer was applied to maize plants at the 5th leaf stage”
e1“For this particular zinc treatment, however, the length of cob can also be applied as a component of yield structure significantly shaping the final grain yield”
Claim · model-written summary
Zinc fertilizer improved maize yield structure elements.
- Treatment
- zinc fertilizere1
- Outcome
- yield structure elementse1
- Direction
- increaseinferrede1
- Setting
- three-year field studye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“verified within a three-year field study, where zinc fertilizer was applied to maize plants at the 5th leaf stage”
e1“Yield forming effect of zinc fertilizer revealed via improvement of yield structure elements”
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