26 
Of the total acreage of mangolds in 1925, 359,000 acres, the 
eastern and north-eastern divisions had over 41 per cent., while 
the north-western, south-western and west midland divisions 
together had less than 30 per cent. Of the total production of 
7,130,000 tons the two former divisions produced 2,890,000 tons, 
or 41 per cent., and the latter three divisions 2,265,000 tons or 
32 per cent. 
Sugar Beet. *—The growing of sugar beet is of very recent 
development in this country, but the area has extended rapidly, 
rising from negligible dimensions in 1920 to 22,440 acres in 
1924 and 54,750 acres in 1925. The yield per acre was 8-2 tons in 
1924 and 7-8 tons in 1925, and the total production was 184,000 
tons in the former year and 428,000 tons in 1925. 
(d) Clover and Rotation Grasses and Hay Crops. 
Clover and Rotation Grasses—The geographical distribution 
of clover and rotation grasses in relation to the total arable 
area is shown in Map X. Northumberland, Cumberland and 
Westmorland in the north, Cornwall in the south-west, and all 
counties in Wales, except Cardigan, Monmouth and Carmarthen, 
return 40 per cent. or more of their arable area under rotation 
grasses, while the eastern counties south of Yorkshire (North 
Riding) show a proportion of less than 20 per cent. 
The proportion of rotation grasses affords an indication of 
the extent of the practice of leaving such land unploughed for 
two or more years. For example, the proportion of 53 per cent. 
of the arable area which is under rotation grasses in Cornwall 
suggests that the average length of time during which land 
sown to grass is left unploughed in that county is at least three 
to four years. 
The proportion of rotation grasses to total arable area in 
England and Wales has increased from 21 per cent. in 1880 to 
24 per cent. at the present time. The increase is fairly general 
throughout the country and only in a few of the counties on 
the eastern side of the country (Huntingdon, Norfolk, Yorkshire 
(West Riding) and Kent) are there appreciable reductions. 
Actually the area of rotation grasses has declined in nearly every 
county and it is only the reduction in the arable area which causes 
the increase in the proportion of temporary grass land. But 
this increase in the proportion probably indicates a general 
tendency to increase the length of time during which rotation 
grasses are left unploughed. 
Seeds Hay.—The area of clover and rotation grasses is 
2,574,000 acres and about two-thirds of this area is cut for hay. 
The proportion so cut lies between 80 and 90 per cent. in the 
great bulk of the counties in the eastern half of the country, 
but Yorkshire (East Riding), with only about 30 per cent. of 
* More detailed information as to the acreage and production of sugar 
beet in 1925 is given in the Agricultural Statistics for that year, Parts 1 
and IT.