Residual P (kg・ha⁻¹ of P₂O₅)

Grain Productivity (Mg・ha⁻¹)*

Net Revenue (US$)

0

120.48 c

105.13

60

256.32 b

210.73

70

256.37 b

208.47

80

393.44 a

326.26

90

295.82 ab

238.42

100

189.37 bc

142.85