Abstract
Growth regulators can be an important tool in corn crop management, especially in technology-intensive crops grown in densified spatial arrangements, under favorable environmental conditions, and using genotypes with greater vegetative development. The objective of this study was to evaluate the effect of growth regulators associated with sowing date on the growth characteristics, yield components, and grain yield of first-crop corn hybrids. The experiment was performed on a 2014/15 field crop, under a randomized complete block design with four replicates. Treatments were placed in a 2 × 2 × 3 factorial arrangement consisting of two sowing dates (first: 09/19/2014 and second: 11/23/2014), two corn hybrids (2B610PW and 2B810PW), and three conditions of growth regulators (control without application, 400 g a.i. ha-1 trinexapac-ethyl, and 200 g a.i. ha-1 clomazone, both applied when six fully expanded leaves were observed). The following characteristics were evaluated: plant height, ear insertion height, stem diameter, leaf area index, number of rows per ear, number of grains per row, number of grains per ear, ear length, ear diameter, prolificacy, thousand grain weight, and grain yield. Corn development and yield performance were altered by the interaction between sowing date, genotypes, and growth regulators. The second sowing date, which was not limited by water deficiency, resulted in better development and yield performance for the two hybrids. The 2B610 hybrid had a higher yield performance than did 2B810 in the second sowing date. Trinexapac-ethyl and clomazone contributed to higher corn grain yield from the two hybrids at the first sowing date and from the 2B810 hybrid at the second date. Trinexapac-ethyl reduced the size of the 2B810 hybrid at the second date. The growth and leaf area of the 2B810 hybrid were less affected by the restrictive conditions of the first sowing date; consequently, there was a higher grain weight performance that did not allow the differentiation of yield between genotypes for this sowing date.
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Claims 8
Claim · model-written summary
The second sowing date improved development and yield performance of both hybrids.
- Taxon
- corn
Zea mays subsp. mayst1 - Treatment
- second sowing datee0
- Outcome
- development and yield performancee0
- Direction
- bettere0
- Comparator
- first sowing datee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second sowing date, which was not limited by water deficiency, resulted in better development and yield performance for the two hybrids.”
t1“corn hybrids”
e1“at the first sowing date and from the 2B810 hybrid at the second date”
Claim · model-written summary
2B610 yielded more than 2B810 at the second sowing date.
- Taxon
- cornZea mays subsp. mayst1
- Material
- 2B610e0
- Outcome
- yield performancee0
- Direction
- highere0
- Comparator
- 2B810e0
- Setting
- second sowing datee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The 2B610 hybrid had a higher yield performance than did 2B810 in the second sowing date.”
t1“corn hybrids”
Claim · model-written summary
Trinexapac-ethyl raised grain yield for both hybrids at the first sowing date and 2B810 at the second.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Trinexapac-ethyle0
- Outcome
- grain yielde0
- Direction
- highere0
- Qualifier
- the two hybrids at the first sowing date and from the 2B810 hybrid at the second datee0
- Comparator
- control without applicatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trinexapac-ethyl and clomazone contributed to higher corn grain yield from the two hybrids at the first sowing date and from the 2B810 hybrid at the second date.”
e1“control without application”
Claim · model-written summary
Clomazone raised grain yield for both hybrids at the first sowing date and 2B810 at the second.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- clomazonee0
- Outcome
- grain yielde0
- Direction
- highere0
- Qualifier
- the two hybrids at the first sowing date and from the 2B810 hybrid at the second datee0
- Comparator
- control without applicatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trinexapac-ethyl and clomazone contributed to higher corn grain yield from the two hybrids at the first sowing date and from the 2B810 hybrid at the second date.”
e1“control without application”
Claim · model-written summary
Trinexapac-ethyl reduced 2B810 plant size at the second date.
- Taxon
- cornZea mays subsp. mayst1
- Material
- 2B810e0
- Treatment
- Trinexapac-ethyle0
- Outcome
- sizee0
- Direction
- reducede0
- Comparator
- control without applicatione1
- Setting
- second datee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trinexapac-ethyl reduced the size of the 2B810 hybrid at the second date.”
t1“corn hybrids”
e1“control without application”
Claim · model-written summary
Restrictive first-date conditions affected 2B810 growth and leaf area less.
- Taxon
- cornZea mays subsp. mayst1
- Material
- 2B810e0
- Outcome
- growth and leaf areae0
- Direction
- less affectede0
- Setting
- first sowing datee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth and leaf area of the 2B810 hybrid were less affected by the restrictive conditions of the first sowing date”
t1“corn hybrids”
Claim · model-written summary
2B810 had higher grain weight at the first sowing date.
- Taxon
- cornZea mays subsp. mayst1
- Outcome
- grain weight performancee0
- Direction
- highere0
- Setting
- this sowing datee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a higher grain weight performance that did not allow the differentiation of yield between genotypes for this sowing date.”
t1“corn hybrids”
Claim · model-written summary
Yield did not differ between genotypes at the first sowing date.
- Taxon
- cornZea mays subsp. mayst1
- Outcome
- yield between genotypese0
- Direction
- did not allow the differentiatione0
- Setting
- this sowing datee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not allow the differentiation of yield between genotypes for this sowing date.”
t1“corn hybrids”
The same questions in other papers
clomazone · yield · Zea mays (maize)Results differ
2 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
1 paper more in this group
See all 5 papers →trinexapac-ethyl · yield · Zea mays (maize)Results differ
2 papers in the same direction as this paper · 3 in the opposite direction
- negative
- no effect
- negative
2 papers more in this group
See all 6 papers →sowing time · yield · Zea mays (maize)Positive and negative results
177 papers in the same direction as this paper · 89 in the opposite direction · 2 reporting no difference from an alternative
- negative
- negative
- negative
265 papers more in this group
See all 269 papers →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.