Research Article
Optimizing Nitrogen Fertilization Regimes for Sustainable Maize (Zea mays L.) Production on the Volcanic Soils of Buea Cameroon
Figure 3
Impact of nitrogen fertilizer rates (control–0, 50, 100, 150, and 200 kg ha−1) on maize 1000-grain weight (Mean ± SD). Values across N fertilizer rates with different letters are significantly different (P < 0.05).