The study looked at how different levels of phosphorus and zinc affected the growth and yield of fodder cowpea plants. They found that applying 60 kg/ha of phosphorus and 20 kg/ha of zinc sulfate improved plant growth and increased green fodder yield. The combination of these two nutrients had a significant impact on the yield, dry matter production, and nutrient uptake of the cowpea plants. However, using higher levels of phosphorus and zinc than 60 kg/ha and 20 kg/ha respectively led to a decrease in yield and nutrient uptake.