272 FLORIDA GEOLOGICAL SURVEY-SEVENTH ANNUAL REPORT. 
pography is slightly modified and the drainage made more thorough 
by the occurrence of numerous limestone sinks, through which the 
drainage water is carried off into subterranean channels. 
The Norfolk fine sand supports a growth of pine, blackjack oak, 
turkey oak, water oak, and live oak. There is a scattered growth 
of wire grass. 
An analysis of a typical sample of this soil to determine its lime 
requirements gave the following* results: 
CaO per 
acre-fout 
CaC 03 per 
acre-foot 
Soil 
Pounds 
2,450 
1,750 
Pounds 
5,900 
3,500 
Subsoil . _ 
Probably 80 per cent of the type is under cultivation. The soil 
is easily handled, and produces well under ordinary conditions. With 
continuous cultivation the humus content decreases rapidly unless 
maintained by the addition of green manure or barnyard refuse at 
frequent intervals. Crop rotation has received but little attention 
on the type, the farmers in most cases hoping to compensate by 
heavy applications of commercial fertilizers the damage done by 
injudicious farm practices. The restoration of this type from an 
impoverished condition may be more quickly accomplished than in 
case of most of the soils of the county. 
The Norfolk fine sand is naturally a warm soil, while the texture 
is such as to retain, especially in the flat areas, a water supply suf¬ 
ficient for the maturing of most crops. It is regarded as a very de¬ 
sirable soil for early truck crops and is extensively utilized along 
the Atlantic seaboard for the growing of such crops as must be 
forced to an early maturity in order to command the high prices of 
the winter and early spring markets. Among the products of this 
class are Irish potatoes, cucumbers, peppers, snap beans, watermel¬ 
ons, cantaloupes, lettuce, radishes, green peas, and most of the ber¬ 
ries. In certain localities cigar-wrapper tobacco has been success¬ 
fully grown on this type under shades and with irrigation. 
The type in Bradford County is used mainly for the general farm 
crops. Cotton and corn are grown extensively and do' well with 
heavy applications of commercial fertilizer. Corn averages about 
15 bushels and cotton about one-third bale per acre. Cowpeas and 
