Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Italy - Italian Agriculture
While in the capital the only object aimed at was to get rid of palpable evils by police ordinances on the greatest scale, it was a far more difficult task to remedy the deep disorganization of Italian economics. Its radical misfortunes were those which we previously noticed in detail--the disappearance of the agricultural, and the unnatural increase of the mercantile, population-- with which an endless train of other evils was associated. The reader will not fail to remember what was the state of Italian agriculture.
In spite of the most earnest attempts to check the annihilation of the small holdings, farm-husbandry was scarcely any longer the predominant species of economy during this epoch in any region of Italy proper, with the exception perhaps of the valleys of the Apennines and Abruzzi. As to the management of estates, no material difference is perceptible between the Catonian system formerly set forth(50) and that described to us by Varro, except that the latter shows the traces for better and for worse of the progress of city-life on a great scale in Rome.
50. Cf. III. XII. The Management of the Land and Its Capital
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=97