High Soil Phosphorus Application Significantly Increased Grain Yield, Phosphorus Content but Not Zinc Content of Cowpea Grains

To ameliorate the impact of soil phosphorus (P) deficiency on cowpea, use P-based fertilizers is recommended. Plant zinc (Zn) an essential nutrient required by plants in a wide range processes, such as growth hormone production and metabolism. However, negative association between plant Zn content high P application has been reported some crops. There are few reports about relationship cowpea. Thus, this study investigated response cowpeas to three rates screenhouse (0, 1.5, 30 mg P/kg) field 10, 60 kg P2O5/ha) their effects content, biomass, grain yield. In screenhouse, shoot root dry weights, were measured. Shoot weight, yield, P, contents determined from plants. Higher led increased biomass yield experiment but not associated with significant change or content. was correlation (p < 0.05). The effect higher reduced may be genotype-dependent could circumvented if genotypes under identified.