Seshadri constants over fields of characteristic zero

Let X be a smooth projective variety defined over field k of characteristic 0 and let L nef line bundle k. We prove that if x∈X is k-rational point then the Seshadri constant ε(X,L,x) k‾ same as show, by constructing families examples, there are varieties whose global ε(X) zero. also result on existence curve with natural (and necessary) hypothesis.