Claim · model-written summary
Application of Mg–S–Zn–B had no effect on maize yield in other countries.
Zea maysNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Information is scarce for maize ( Zea mays L.) response to nutrient application for many production areas in tropical Africa”
e6“Application of Mg–S–Zn–B caused a mean yield increase of 0.73 Mg ha −1 in Rwanda but had no effect in other countries”
Title
Maize‐Nutrient Response Functions for Eastern and Southern Africa
Charles S. Wortmann; Catherine Senkoro; Athanase R. Cyamweshi; et al. Agronomy Journal 2018. doi:10.2134/agronj2018.04.0268
Other claims from this paper (14)
- Observation Country mean grain yield responded to N rate in a curvilinear-to-plateau pattern, but linearly in Malawi.
- Intervention effect Mean yield increase due to 50 kg N ha −1 was 0.94 Mg ha −1 in Kenya, Tanzania and Zambia.
- Intervention effect Mean yield increase due to 50 kg N ha −1 was 1.59 Mg ha −1 in Malawi and Rwanda.
- Association Response to N was related to yield where no fertilizer was applied (r = 0.40).
- Intervention effect In Rwanda, P application increased maize yield by 0.99 Mg ha −1 at 15 kg ha −1.
- Intervention effect In Rwanda, K application increased maize yield by 0.22 Mg ha −1 at 15 kg ha −1.
- Intervention effect Application of Mg–S–Zn–B increased maize yield by 0.73 Mg ha −1 in Rwanda.
- Intervention effect Affordable fertilizer at 50% of the economically optimum rate on twice the land gave a mean gain of 50% in production and agronomic efficiency.
- Intervention effect Affordable fertilizer at 50% of the economically optimum rate on twice the land gave a mean gain of 72% in profit/cost ratio.
- Association Soil test results were not related to maize response to applied nutrients.
- Association Historical yield appears to be weakly predictive of maize N response.
- Recommendation The authors recommend that the country-level P and K response functions be widely applied, except for Kenya.
- Observation There is little potential for profitable response to phosphorus and potassium in most areas of East Africa.
- Observation Site-year by N-rate interactions within countries often accounted for little variation in maize yield.