Abstract
This study was conducted to determine the optimum planting date for maize (Zea mays L.) to cope with the negative impacts of climate change in the marginal rainforest agro-ecology as typified at Ile-Ife, SW Nigeria. Five maize varieties were planted weekly, in 3-replicate randomized complete block design experiments at the Obafemi Awolowo University Teaching and Research Farm, throughout the 2016 and 2017 cropping seasons. The varieties were monitored for seedling and adult plant traits including grain yield with its components. Statistical analysis showed significant effect of planting dates (DOP) on all traits. The first few DOPs in March and April had the highest grain yield which reduced with delayed planting till June and increased again mid July/August before finally dropping off thereafter. The higher yield in the earlier dates each year, was due to early flowering and taller plants with higher ear placement. Planting after the first few rains in March/April was the optimum for the first cropping season, and late July to mid-August was best for the second cropping season in this agroclimatic zone. Planting beyond these periods results in poor grain yield and pre-disposes the crop to terminal drought, which could result in complete crop failure.
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Claims 9
Claim · model-written summary
Planting date significantly affected all measured maize traits.
Zea maysNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Statistical analysis showed significant effect of planting dates (DOP) on all traits”
t0“Planting date effects on maize (Zea mays L.) growth and development in the rainforest of southwestern Nigeria”
Claim · model-written summary
Early March and April planting gave the highest grain yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The first few DOPs in March and April had the highest grain yield”
t0“Planting date effects on maize (Zea mays L.) growth and development in the rainforest of southwestern Nigeria”
Claim · model-written summary
Grain yield fell as planting was delayed until June.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yield which reduced with delayed planting till June”
t0“Planting date effects on maize (Zea mays L.) growth and development in the rainforest of southwestern Nigeria”
Claim · model-written summary
Grain yield increased with mid July/August planting.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased again mid July/August”
t0“Planting date effects on maize (Zea mays L.) growth and development in the rainforest of southwestern Nigeria”
e1“The first few DOPs in March and April had the highest grain yield”
Claim · model-written summary
Grain yield fell after mid July/August planting.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“before finally dropping off thereafter”
t0“Planting date effects on maize (Zea mays L.) growth and development in the rainforest of southwestern Nigeria”
e1“The first few DOPs in March and April had the highest grain yield”
Claim · model-written summary
Higher yield at earlier dates was attributed to early flowering and taller plants with higher ear placement.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher yield in the earlier dates each year, was due to early flowering and taller plants with higher ear placement”
t0“Planting date effects on maize (Zea mays L.) growth and development in the rainforest of southwestern Nigeria”
Claim · model-written summary
Planting after the first few March/April rains was optimal for the first cropping season.
- Outcome
- Planting after the first few rains in March/Aprile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Planting after the first few rains in March/April was the optimum for the first cropping season”
t0“Planting date effects on maize (Zea mays L.) growth and development in the rainforest of southwestern Nigeria”
Claim · model-written summary
Late July to mid-August planting was best for the second cropping season.
- Outcome
- late July to mid-Auguste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late July to mid-August was best for the second cropping season”
t0“Planting date effects on maize (Zea mays L.) growth and development in the rainforest of southwestern Nigeria”
Claim · model-written summary
Planting beyond those periods produced poor grain yield and predisposed maize to terminal drought and possible crop failure.
- Treatment
- Planting beyond these periodse0
- Outcome
- grain yielde0
- Direction
- poore0
- Qualifier
- terminal droughte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Planting beyond these periods results in poor grain yield and pre-disposes the crop to terminal drought, which could result in complete crop failure”
t0“Planting date effects on maize (Zea mays L.) growth and development in the rainforest of southwestern Nigeria”
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