Phosphate (PO43-, Pi) is the sole phosphorus (P) containing compound utilized for plant growth, leading to widespread use of Pi fertilizers. An alternative form P, phosphite (PO33-, Phi) has increasingly been used in many crop systems, including amenity turfgrass, not only as a nutrient source but also pesticide and biostimulant. There are, however, conflicting reports efficacy benefits Phi P. ...