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
The landlord, moreover, could hold his ground better against competitors by means of improvements or changes in cultivation, and he could content himself with a smaller return from the soil than the farmer, who wanted capital and intelligence and who merely had what was requisite for his subsistence. Hence the Roman landholder comparatively neglected the culture of grain--which in many rases seems to have been restricted to the raising of the quantity required for the staff of labourers(13)--and gave increased attention to the production of oil and wine as well as to the breeding of cattle.
13. Accordingly Cato calls the two estates, which he describes, summarily "olive-plantation" (-olivetum-) and "vineyard" (-vinea-), although not wine and oil merely, but grain also and other products were cultivated there. If indeed the 800 -culei-, for which the possessor of the vineyard is directed to provide himself with casks (11), formed the maximum of a year's vintage, the whole of the 100 -jugera- must have been planted with vines, because a produce of 8 -culei- per -jugerum- was almost unprecedented (Colum. iii. 3); but Varro (i. 22) understood, and evidently with reason, the statement to apply to the case of the possessor of a vineyard who found it necessary to make the new vintage before he had sold the old.
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Reference address : https://www.ellopos.net/elpenor/rome/3-12-management-land-capital.asp?pg=21