372 
SOILS AND AGRICULTURE OF NORFOLK. 
mechanial analysis is of very little value, as varying amounts 
of the calcarious granules escape solution in the dilute acid 
used to disentegrate the soil, and are included in the 
subsequent separation. 
On the analyses given in Tables VI. and VII. the Stiffkey 
soil is clearly the one most free from admixture with other 
types The sample was taken from a field on the top of a 
hill, and may be regarded as a pure weathered soil, derived 
entirely from the underlying rock, only about 4 inches deep 
and turned over and over by the plough which runs on the 
solid chalk. 
In the other soils there is a good deal of sand from the 
glacial sand and gravels that once laid over the coast line. 
The'chalk land along the coast produces some of the finest 
quality barley in all England, grown very largely after 
wheat to improve its quality as far as possible. The yield of 
this type of grain is, however, small. 
The sample taken from Morston was from a field almost 
at sea level, and much of the chalk in the top soil had been 
leached out by water. 
Table IX. 
Chemical analysis of some Crag Soils : — 
Wroxham 
Ranworth. 
Ludham. 
Hickling. 
Moisture 
P25 
1-24 
1-55 
1-35 
Organic & loss on ignition 
348 
4'07 
4-15 
443 
Nitrogen 
•148 
T28 
14 
■152 
Potash 
T649 
•2153 
•2968 
•3001 
Phosphorus pentoxide . . 
•103 
•065 
•071 
•109 
Calcium and magnesium 
carbonates 
•3 
•88 
•78 
•04 
Insoluble residue 
90-92 
88-85 
85-8 
84-13 
