It's the diminutive of stubble. Small stubble. It is clarified that the meaning of stubble is different from Spain to America, because in Spain stubble are the residues that remain after the harvest of a cereal and that is usually dedicated to cattle fodder. In America, stubble is mountain, weed, undesirable vegetation that comes out on an abandoned or un grown land. Affectionate way to call a small estate or plot.
