Abstract
Abstract Low inherent nitrogen (N), phosphorus (P), and potassium (K) contents of smallholder farms limit maize grain yield. Maize grain yield response to N, P, and K mineral fertilizer application and economically optimal rates for nitrogen (EOR N ), phosphorus (EOR P ), and potassium (EOR K ) were evaluated on a Ferric Acrisol within the semi-deciduous forest zone of Ghana. The nutrient rates evaluated were N (0, 30, 60, 90, and 120 kg N ha −1 ), P (0, 30, 60, and 90 kg ha −1 P 2 O 5 ), and K (0, 30, 60 and 90 kg ha −1 K 2 O). The treatments were arranged in a randomized complete block with three replications using an incomplete factorial design. Nutrient responses were determined using asymptotic quadratic-plus plateau functions. The best nitrogen rate for all P and K levels was 60 kg ha −1 , which gave grain yield of 5 t ha − 1 . Nitrogen uptake, N agronomic and N recovery efficiencies peaked at 60 kg N ha − 1 while N partial factor productivity declined with increasing N application rate. Cost to grain price ratios (CP) were 1.29, 1.65, and 1.65 for N, P, and K, respectively. The EOR N was 61 kg ha −1 , 32% less than the recommended 90 kg N ha −1 for maize production in the semi-deciduous forest zone of Ghana. Nitrogen application had the lowest CP ratio, making its application economically profitable than P and K. The findings suggest that the application of N at 61 kg N ha −1 to maize is economically profitable than at higher application rates. However, further studies should be conducted on farmers’ fields to validate the results obtained.
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Claims 8
Claim · model-written summary
A nitrogen rate of 60 kg ha −1 gave the best grain yield of 5 t ha − 1 across phosphorus and potassium levels.
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Verbatim
e0“The best nitrogen rate for all P and K levels was 60 kg ha −1 , which gave grain yield of 5 t ha − 1”
Claim · model-written summary
Nitrogen uptake peaked at 60 kg N ha − 1.
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Verbatim
e0“Nitrogen uptake, N agronomic and N recovery efficiencies peaked at 60 kg N ha − 1”
Claim · model-written summary
Nitrogen agronomic and recovery efficiencies peaked at 60 kg N ha − 1.
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Verbatim
e0“N agronomic and N recovery efficiencies peaked at 60 kg N ha − 1”
Claim · model-written summary
Nitrogen partial factor productivity declined as nitrogen application increased.
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Verbatim
e0“N partial factor productivity declined with increasing N application rate”
Claim · model-written summary
Cost to grain price ratios were 1.29, 1.65 and 1.65 for N, P and K, respectively.
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Verbatim
e0“Cost to grain price ratios (CP) were 1.29, 1.65, and 1.65 for N, P, and K, respectively”
Claim · model-written summary
Economically optimal nitrogen was 61 kg ha −1, 32% below the recommended 90 kg N ha −1.
- Outcome
- EOR Ne0
- Direction
- less thane0
- Value
- 61 kg ha −1e0
- Qualifier
- 32%e0
- Comparator
- recommended 90 kg N ha −1e0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The EOR N was 61 kg ha −1 , 32% less than the recommended 90 kg N ha −1 for maize production”
Claim · model-written summary
Nitrogen application had the lowest cost to grain price ratio and was economically more profitable than P and K.
Not reportedTaxon
Verbatim
e0“Nitrogen application had the lowest CP ratio, making its application economically profitable than P and K”
Claim · model-written summary
The authors recommend applying 61 kg N ha −1 to maize rather than higher rates for profitability.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the application of N at 61 kg N ha −1 to maize is economically profitable than at higher application rates”
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