Abstract
There is little information on how different spatial arrangements affect modern maize hybrids under irrigation in the maize second growing season in Brazil. The objectives of this study were to evaluate the performance of maize genotypes with different canopy architecture as a function of different spatial arrangements in the Southeast Brazil. Two maize hybrids with semi-erect (DKB 390) and erect (DKB 230) leaves were cultivated during the second season and evaluated for different plant densities (4, 7 and 10 10 4 plantsha -1 ) and row spacings (0.25, 0.50 and 1.00 m), under irrigation in a tropical environment. The increase in plant density increased plant height and ear insertion height, but reduced stalk diameter. The absorbed photosynthetically active radiation and the leaf area index also increased in higher plant densities, with a reduction of the SPAD index. The increase in plant density enhanced grain yield, however, there was no difference of yield between different row spacings. The hybrid DKB 230 (upright leaves) showed greater yield potential compared to DKB 390 (semi-upright leaves). The critical leaf area index was 5.2 and 4.3 for the hybrids DKB 230 and DKB 390, respectively. The estimated plant density that provides the maximum yield are 9.7 10 4 and 8.8 10 4 plantsha -1 for the hybrids DKB 230 and DKB 390, respectively.
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Claims 11
Claim · model-written summary
Increased plant density increased maize plant height and ear insertion height.
- Taxon
- maize hybridst0
- Treatment
- plant densitye1
- Outcome
- plant height and ear insertion heighte1
- Direction
- increasede1
Not reportedComparator
Verbatim
t0“maize hybrids”
e1“The increase in plant density increased plant height and ear insertion height, but reduced stalk diameter”
Claim · model-written summary
Increased plant density reduced maize stalk diameter.
Not reportedComparator
Verbatim
t0“maize hybrids”
e1“The increase in plant density increased plant height and ear insertion height, but reduced stalk diameter”
Claim · model-written summary
Higher plant densities increased absorbed photosynthetically active radiation and leaf area index of maize.
- Taxon
- maize hybridst0
- Treatment
- higher plant densitiese2
- Outcome
- absorbed photosynthetically active radiation and the leaf area indexe2
- Direction
- increasede2
Not reportedComparator
Verbatim
t0“maize hybrids”
e2“The absorbed photosynthetically active radiation and the leaf area index also increased in higher plant densities, with a reduction of the SPAD index”
Claim · model-written summary
Higher plant densities reduced the SPAD index of maize.
Not reportedComparator
Verbatim
t0“maize hybrids”
e2“The absorbed photosynthetically active radiation and the leaf area index also increased in higher plant densities, with a reduction of the SPAD index”
Claim · model-written summary
Increased plant density enhanced maize grain yield.
Not reportedComparator
Verbatim
t0“maize hybrids”
e3“The increase in plant density enhanced grain yield”
Claim · model-written summary
Grain yield did not differ between row spacings.
Verbatim
t0“maize hybrids”
e4“there was no difference of yield between different row spacings”
Claim · model-written summary
Hybrid DKB 230 showed greater yield potential than DKB 390.
Verbatim
t0“maize hybrids”
e5“The hybrid DKB 230 (upright leaves) showed greater yield potential compared to DKB 390 (semi-upright leaves)”
Claim · model-written summary
The critical leaf area index of DKB 230 was 5.2.
Verbatim
t0“maize hybrids”
e6“The critical leaf area index was 5.2 and 4.3 for the hybrids DKB 230 and DKB 390, respectively”
Claim · model-written summary
The critical leaf area index of DKB 390 was 4.3.
Verbatim
t0“maize hybrids”
e6“The critical leaf area index was 5.2 and 4.3 for the hybrids DKB 230 and DKB 390, respectively”
Claim · model-written summary
The estimated plant density giving maximum yield for DKB 230 is 9.7 × 10^4 plants ha-1.
Verbatim
t0“maize hybrids”
e7“The estimated plant density that provides the maximum yield are 9.7 10 4 and 8.8 10 4 plantsha -1 for the hybrids DKB 230 and DKB 390, respectively”
Claim · model-written summary
The estimated plant density giving maximum yield for DKB 390 is 8.8 × 10^4 plants ha-1.
Verbatim
t0“maize hybrids”
e7“The estimated plant density that provides the maximum yield are 9.7 10 4 and 8.8 10 4 plantsha -1 for the hybrids DKB 230 and DKB 390, respectively”
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