SOILS AND AGRICULTURE OF NORFOLK. 
383 
The soil may be derived from peat, mud, or estuarine silt, 
and varies very much in agricultural value, the silt soils being 
the best and most fertile. A good deal of the silty soil is 
under orchards and small fruit, Wisbech forming the centre 
of a large and growing fruit trade. The peaty ones are more 
to the southward, and the chief crops are wheat and 
potatoes, which take the place of turnips in the fen rota- 
tions. These soils yield an enormous weight of middle-grade 
potatoes. Buckwheat is also grown, with some mustard and 
a little chicory. 
The analyses given in Tables XVIII. and XIX. show very 
well the two different types. Terrington, Walpole, and 
Walsoken are silt soils, very largely under fruit and orchards, 
fertile, but expensive and difficult to work in wet seasons. 
The land is nearly all below sea level and protected by sea- 
walls. The drainage rate is about 5s. per acre. The Upwell 
sample is of a peaty silt, containing a high percentage of 
organic matter. It is a typical potato-growing soil. 
