Agriculture 



141 



mixtures. On both light and heavy soils, the layers are ploughed up after 

 one year, except on certain of the latter soils where there is a growing 

 appreciation of the value of the system of akernate husbandry. The failure 

 of the leyer on the lighter soils may well prejudice the yields of tlie other 

 crops in the rotation and in consequence great importance is attached to 

 its proper estabhshment and careful management. 



CAMBRIDGESHIRE 

 POTATOES 



Each dot 

 represents 25 acres 



CAMBRIDGESHIRE 

 SUGAR BEET 



1928 



Each dot 

 represents 25 acres 



Miles 



i ... 9 . . . ? 



Fig. 34- Fig- 35- 



Redrawn from M. Messer, An Agricultural Atlas of England and Wales (1932). 



Mustard for seed is also an important crop. It may take the place of a 

 cereal or fallow crop, and in a catchy season the land upon which it is to 

 be sown may not be determined until late spring. The heavier yields are 

 obtained on the fen soils, but excellent results are also recorded on the 

 lighter and heavier soils, which carry some 50 per cent of the 8000 odd 

 acres grown each year. A further considerable acreage is sown each year 

 with mustard for folding or for ploughing in. 



Beans, long regarded as a standard crop of a heavy land rotation, are not 

 now entitled to a place of proimnence. The 6000 acres grown in 1937 

 represented only one-quarter of the area under this crop in 1913. There is 



