How to choose the number of particles per site in Fermionic DMRG?

Main Question or Discussion Point

I am doing DMRG (in traditional formalism, not MPS) for Hubbard model
H = -t ∑iσci,σ ci+1,σ + U∑ini,σni,σ-
In every iteration we add two sites to the system, but how do we set that how many particles are allowed in the system?
 
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atyy
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