Bray has modified the mitscherlich equation to

Answer: Option D

The equation introduced by Mitscherlich has been generally used to express nutrient-yield relationships as follows: $$\mathbf{y}=\mathbf{A}\left(1-{\mathbf{e}}^{-\mathbf{eb}-\mathbf{ex}}\right)$$
Bray has modified the mitscherlich equation to $$\mathbf{log}\left(\mathbf{A}-\mathbf{y}\right)=\mathbf{logA}-{\mathbf{C}}_1\mathbf{b}-\mathbf{cx}$$
Where A = % theoretical maximum yield, y = actual yield obtained in q ha^-1, b = native soil test value in kg ha^-1, x = fertilizer nutrient applied in kg ha^-1, c₁ and c = constants i.e., the efficiency of soil and fertilizer nutrients respectively.