Abstract
Field trials were conducted during 2017 and 2018 rainy season, to investigate the effect of nitrogen fertilizer rates and time of application on the growth and yield of cowpea. The treatment consisted of three levels of urea: 0, 40, 80 kg N ha-1 and the times of fertilizer application: during planting of cowpea, 2 weeks after planting, 4 weeks after planting and 6 weeks after planting; which were factorially combined to form twelve treatments and laid in Randomized Complete Block Design (RCBD). The results showed that, Nitrogen fertilizer rates and time of application had a significant increased on all the growth and yield parameters of cowpea in both years of trials. Application of 80 kg N ha-1 produced the highest number of cowpea leaves (134.45 and 139.23), number of branches (9.45 and 10.54), vine length (78.23cm and 80.12cm) and highest seed weight of 0.52 t ha-1 in both 2017 and 2018 trials. However, the control plots produced plants with the highest number of root nodules (14.78 and 12.49) in both years of cropping. Also, application of nitrogen fertilizer at two weeks after planting of cowpea produced the highest growth and seed weight of 0.68 t ha-1 in 2017 cropping; while in 2018 trial, application of nitrogen fertilizer at two weeks after cowpea planting produced seed yield of 0.69tha-1 which is statistically similar with application of nitrogen fertilizer on the fourth week after planting which produced 0.55 t ha-1 of cowpea seeds. The interaction between nitrogen fertilizer application rates and time of application did not showed any significant difference in cowpea yield and yield components in both years of cropping.
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Claims 11
Claim · model-written summary
Nitrogen rate and timing significantly increased cowpea growth and yield parameters in both years.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- Nitrogen fertilizer rates and time of applicatione0
- Outcome
- growth and yield parameterse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilizer rates and time of application had a significant increased on all the growth and yield parameters of cowpea in both years of trials”
Claim · model-written summary
At 80 kg N ha-1, cowpea leaf numbers were highest at 134.45 and 139.23 across the two years.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- 80 kg N ha-1e0
- Outcome
- number of cowpea leavese0
- Direction
- higheste0
- Value
- 134.45 and 139.23e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 80 kg N ha-1 produced the highest number of cowpea leaves (134.45 and 139.23)”
Claim · model-written summary
At 80 kg N ha-1, cowpea branch numbers were highest at 9.45 and 10.54.
- Taxon
- cowpeaVigna unguiculatae1
- Treatment
- 80 kg N ha-1e1
- Outcome
- number of branchese0
- Direction
- higheste1
- Value
- 9.45 and 10.54e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“number of branches (9.45 and 10.54)”
e1“Application of 80 kg N ha-1 produced the highest number of cowpea leaves”
Claim · model-written summary
At 80 kg N ha-1, vine length was highest at 78.23cm and 80.12cm.
- Taxon
- cowpeaVigna unguiculatae1
- Treatment
- 80 kg N ha-1e1
- Outcome
- vine lengthe0
- Direction
- higheste1
- Value
- 78.23cm and 80.12cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“vine length (78.23cm and 80.12cm)”
e1“Application of 80 kg N ha-1 produced the highest number of cowpea leaves”
Claim · model-written summary
At 80 kg N ha-1, seed weight was highest at 0.52 t ha-1.
- Taxon
- cowpeaVigna unguiculatae1
- Treatment
- 80 kg N ha-1e1
- Outcome
- seed weighte0
- Direction
- higheste0
- Value
- 0.52 t ha-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest seed weight of 0.52 t ha-1”
e1“Application of 80 kg N ha-1 produced the highest number of cowpea leaves”
Claim · model-written summary
Controls had the most root nodules, 14.78 and 12.49 in the two years.
- Taxon
- cowpeaVigna unguiculatae1
- Treatment
- control plotse0
- Outcome
- number of root nodulese0
- Direction
- higheste0
- Value
- 14.78 and 12.49e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“control plots produced plants with the highest number of root nodules (14.78 and 12.49)”
e1“cowpea seeds”
Claim · model-written summary
Application two weeks after planting gave the highest growth in 2017.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- application of nitrogen fertilizer at two weeks after plantinge0
- Outcome
- growthe0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of nitrogen fertilizer at two weeks after planting of cowpea produced the highest growth”
Claim · model-written summary
Application two weeks after planting gave 0.68 t ha-1 seed weight in 2017.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- application of nitrogen fertilizer at two weeks after plantinge0
- Outcome
- seed weighte0
- Direction
- higheste0
- Value
- 0.68 t ha-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of nitrogen fertilizer at two weeks after planting of cowpea produced the highest growth and seed weight of 0.68 t ha-1 in 2017 cropping”
Claim · model-written summary
Two-week application gave 0.69tha-1 seed yield in 2018.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- application of nitrogen fertilizer at two weeks after cowpea plantinge0
- Outcome
- seed yielde0
- Value
- 0.69tha-1e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of nitrogen fertilizer at two weeks after cowpea planting produced seed yield of 0.69tha-1”
Claim · model-written summary
Four-week application gave 0.55 t ha-1 seeds in 2018, statistically similar to two-week application.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- application of nitrogen fertilizer on the fourth week after plantinge0
- Outcome
- cowpea seedse0
- Direction
- statistically similare0
- Value
- 0.55 t ha-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“statistically similar with application of nitrogen fertilizer on the fourth week after planting which produced 0.55 t ha-1 of cowpea seeds”
Claim · model-written summary
Nitrogen rate and timing had no significant interaction for cowpea yield and yield components.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- nitrogen fertilizer application rates and time of applicatione0
- Outcome
- cowpea yield and yield componentse0
- Direction
- did not showed any significant differencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interaction between nitrogen fertilizer application rates and time of application did not showed any significant difference in cowpea yield and yield components”
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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.