Abstract
Abstract The influence of four nitrogen levels (0, 60, 90 and 120 kg N/ha) on growth of maize and development of lepidopterous pests was investigated in a field trial. Nitrogen had a positive effect on both plant growth variables (plant height, stem diameter and yield), and development and survival of Sesamia calamistis and Eldana saccharina , and thereby increased the incidence of dead hearts and stem tunneling. However, the percent yield loss due to artificial infestation decreased with increasing N application rate from 20% to 11% in the in the 0kg/ha and 120kg/ha treatment, respectively. Using a multiple regression analysis, plant height, plant diameter and stem tunneling were found to be the most important variables explaining the variability in maize yield.
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Claims 5
Claim · model-written summary
Nitrogen had a positive effect on maize growth variables (plant height, stem diameter and yield).
- Treatment
- four nitrogen levelse0
- Outcome
- plant growth variables (plant height, stem diameter and yield)e2
- Direction
- positivee2
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four nitrogen levels (0, 60, 90 and 120 kg N/ha)”
e1“growth of maize”
e2“Nitrogen had a positive effect on both plant growth variables (plant height, stem diameter and yield), and development and survival of Sesamia calamistis and Eldana saccharina”
Claim · model-written summary
Nitrogen had a positive effect on the development and survival of Sesamia calamistis and of Eldana saccharina on maize.
- Treatment
- four nitrogen levelse0
- Interactor
- Sesamia calamistisSesamia calamistise2pest
- Second interactor
- Eldana saccharina
Eldana saccharinae2pest - Outcome
- development and survival of Sesamia calamistis and Eldana saccharinae2
- Direction
- positivee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four nitrogen levels (0, 60, 90 and 120 kg N/ha)”
e1“growth of maize”
e2“Nitrogen had a positive effect on both plant growth variables (plant height, stem diameter and yield), and development and survival of Sesamia calamistis and Eldana saccharina”
Claim · model-written summary
Nitrogen increased the incidence of dead hearts and stem tunneling in maize.
- Treatment
- four nitrogen levelse0
- Outcome
- incidence of dead hearts and stem tunnelinge3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four nitrogen levels (0, 60, 90 and 120 kg N/ha)”
e1“growth of maize”
e3“thereby increased the incidence of dead hearts and stem tunneling”
Claim · model-written summary
Percent yield loss due to artificial infestation in maize decreased from 20% to 11% as the N application rate increased from 0 kg/ha to 120 kg/ha.
- Treatment
- increasing N application ratee4
- Outcome
- percent yield loss due to artificial infestatione4
- Direction
- decreasede4
- Value
- 20% to 11%e4
- Comparator
- 0kg/hae4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“growth of maize”
e4“the percent yield loss due to artificial infestation decreased with increasing N application rate from 20% to 11% in the in the 0kg/ha and 120kg/ha treatment, respectively”
Claim · model-written summary
Plant height, plant diameter and stem tunneling were the most important variables explaining the variability in maize yield in a multiple regression analysis.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Using a multiple regression analysis, plant height, plant diameter and stem tunneling were found to be the most important variables explaining the variability in maize yield”
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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.