The present output amounts to roughly 150 million gallons, and the acreage under the vine has increased from 107,048 hectares in 1890 to 167,657 hectares in 1905.
Large holdings of at least 500 hectares (a hectare equals about 22 acres) are indispensable to the profitable pursuit of extensive agriculture.
During the years in which the soil is allowed to lie fallow, the grass and weeds which spring up serve as pasture for cattle, but the poverty of the pasture is such that at least two hectares are required for the maintenance of every animal.
The power of the pumping-engines is taken on the basis of 12 h.p. per moo hectares for every metre that the water has to be raised, or stated in another form, the engines must be capable of raising nearly 9 lb of water through I yd.
A table given by Krabe, based on results obtained for 12 plantations amounting to 20 hectares (50 English acres) during 20 years showed the value of produce per Prussian acre (.2553 of an hectare) to be in the 1st year, £3, 6s.