Define Diffusion Pressure Deficit

Diffusion pressure deficit (D.P.D.): The differences of the diffusion pressure between a solution and a solvent at N.T.P is called diffusion pressure deficit.

In a plant cell, the pressure (S) equal to the difference between the osmotic pressure (P) and the turgor pressure (T). When the osmotic and turgor pressures are equal, the plant does not absorb water. Diffusion Pressure Deficit is the algebraic sum of all the forces tending to cause water to move into a plant cell.