Abstract
This study aims to determine the optimal N, P, K, Mg and Zn rates for groundnut production on Ferric and Plintic Luvisol in the Sudano-Guinean and Sudanian zones of Benin Republic. Two years (2018 and 2019) experiment was carried out in the municipality of Ouessè in the Sudano-Guinean zone and Bembèrèkè in the Sudanian zone. The tested nutrient doses were N (0, 20 and 40 kg⋅ha−1), P (0, 25 and 50 kg⋅ha−1), K (0, 20 and 40 kg⋅ha−1), Mg (0, 15 and 30 kg⋅ha−1) and Zn (0, 4 and 8 kg⋅ha−1). The Box and Behnken rotating design is used to define the N, P, K, Mg and Zn rate combinations leading to 46 combinations. A completely randomized bloc design was setting up considering farmers as replication. In total, four farmers’ fields were selected. A one-way analysis of variance is carried out on yield data, using the linear mixed-effect model. Response surface analyses were used to determine the optimal doses for each N, P, K, Mg and Zn. Nodule production (6.5 times higher than the control), number of gynophores (2.8 times higher than the control) and root length (19.2 ± 0.2 cm) of groundnut plants were significantly (p = 0.0001) improved with nutrient application. The response surface analysis shows that treatments N-P-K-Mg-Zn of 16.01-20.18-6.70-5.65-2.47 (in the Sudano-Guinean zone) and 13.1-25.07-11.47-0-1.82 (in the Sudanian zone) are the optimal rates that have induced optimal yield of 2.1 t⋅ha−1 (i.e. 2.5 times the yield in the farmers’ field) pod yield and the best return on investment per hectare. Nevertheless, for a sustainable groundnut producproduction, treatment 13.1-25.07-11.47-20-1.82 is suggested as regular K input is required for the respect of the fertilization laws.
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Claims 8
Claim · model-written summary
Nutrient application raised groundnut nodule production 6.5 times over the control.
- Taxon
- groundnut
Arachis hypogaeae0 - Treatment
- nutrient applicatione0
- Outcome
- Nodule productione0
- Direction
- highere0
- Value
- 6.5 timese0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Verbatim
t0“groundnut”
e0“Nodule production (6.5 times higher than the control), number of gynophores (2.8 times higher than the control) and root length (19.2 ± 0.2 cm) of groundnut plants were significantly (p = 0.0001) improved with nutrient application”
Claim · model-written summary
Nutrient application raised groundnut gynophore number 2.8 times over the control.
- Taxon
- groundnut
Arachis hypogaeae0 - Treatment
- nutrient applicatione0
- Outcome
- number of gynophorese0
- Direction
- highere0
- Value
- 2.8 timese0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Verbatim
t0“groundnut”
e0“Nodule production (6.5 times higher than the control), number of gynophores (2.8 times higher than the control) and root length (19.2 ± 0.2 cm) of groundnut plants were significantly (p = 0.0001) improved with nutrient application”
Claim · model-written summary
Nutrient application significantly improved groundnut root length, reported as 19.2 ± 0.2 cm.
- Taxon
- groundnut
Arachis hypogaeae0 - Treatment
- nutrient applicatione0
- Outcome
- root lengthe0
- Direction
- improvede0
- Value
- 19.2 ± 0.2 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Verbatim
t0“groundnut”
e0“Nodule production (6.5 times higher than the control), number of gynophores (2.8 times higher than the control) and root length (19.2 ± 0.2 cm) of groundnut plants were significantly (p = 0.0001) improved with nutrient application”
Claim · model-written summary
The optimal N-P-K-Mg-Zn rates in the Sudano-Guinean zone were 16.01-20.18-6.70-5.65-2.47.
- Taxon
- groundnut
Arachis hypogaeat0 - Outcome
- optimal ratese0
- Value
- 16.01-20.18-6.70-5.65-2.47e0
- Setting
- Sudano-Guinean zonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Verbatim
t0“groundnut”
e0“treatments N-P-K-Mg-Zn of 16.01-20.18-6.70-5.65-2.47 (in the Sudano-Guinean zone) and 13.1-25.07-11.47-0-1.82 (in the Sudanian zone) are the optimal rates”
Claim · model-written summary
The optimal N-P-K-Mg-Zn rates in the Sudanian zone were 13.1-25.07-11.47-0-1.82.
- Taxon
- groundnut
Arachis hypogaeat0 - Outcome
- optimal ratese0
- Value
- 13.1-25.07-11.47-0-1.82e0
- Setting
- Sudanian zonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Verbatim
t0“groundnut”
e0“treatments N-P-K-Mg-Zn of 16.01-20.18-6.70-5.65-2.47 (in the Sudano-Guinean zone) and 13.1-25.07-11.47-0-1.82 (in the Sudanian zone) are the optimal rates”
Claim · model-written summary
The optimal nutrient rates produced groundnut pod yield of 2.1 t⋅ha−1, 2.5 times yield in farmers’ fields.
- Taxon
- groundnut
Arachis hypogaeat0 - Treatment
- optimal yielde0
- Outcome
- pod yielde0
- Direction
- optimale0
- Value
- 2.1 t⋅ha−1e0
- Comparator
- farmers’ fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Verbatim
t0“groundnut”
e0“optimal yield of 2.1 t⋅ha−1 (i.e. 2.5 times the yield in the farmers’ field) pod yield”
Claim · model-written summary
The optimal nutrient rates also gave the best return on investment per hectare.
- Taxon
- groundnut
Arachis hypogaeat0 - Outcome
- return on investment per hectaree0
- Direction
- beste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Verbatim
t0“groundnut”
e0“the best return on investment per hectare”
Claim · model-written summary
For sustainable groundnut production, the authors suggest treatment 13.1-25.07-11.47-20-1.82 to maintain regular potassium input.
- Taxon
- groundnut
Arachis hypogaeat0 - Outcome
- treatment 13.1-25.07-11.47-20-1.82e0
- Qualifier
- regular K inpute0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Verbatim
t0“groundnut”
e0“for a sustainable groundnut producproduction, treatment 13.1-25.07-11.47-20-1.82 is suggested as regular K input is required for the respect of the fertilization laws”
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