Introduction

• Long-term manure application to soil can lead to phosphorus (P) pollution of waterbodies.
  
  
• Low phytate grains could help reduce the amount of P that is land applied.
  
  
• Manures from animals fed low phytate grains contain less total P, but it is unclear whether this leads to a reduction in soil P solubility, because phytate is relatively immobile in most agricultural soils.
  
  
• Our objectives in this study were to quantify the effects of diet on manure P composition and subsequent differences in P solubility.