10 Florida Agricultural Experiment Station

by loss on ignition. Soil pH was determined with a glass elec-
trode potentiometer following the procedure recommended by
Volk and Bell (20).

 Chemical Composition of Vegetables
 The data in Table 1 show the range and average composition
of vegetables collected from various locations within the state.
From the range in composition with respect to a given con-
stituent and crop it is readily apparent that averages are very
misleading. Those averages from areas including a relatively
wide range of soil types are of much less value than from areas
of closely related types. The detailed data on individual plant
samples and associated soils which appear in Tables 2 to 6, in-
clusive, will be discussed in a later section.
 A statistical analysis of variance was made of the data in
Table 1 in order to have a basis of evaluation of the variations
noted between areas. All differences have a certain value in
arriving at an understanding of the composition of Florida
vegetables, but only those differences between area averages
showing a significance at odds of 19 to 1 or greater will be men-
tioned in this section. Analyses of individual areas are con-
sidered as relatively above or below average if they are sig-
nificantly above or below the general average for the data herein
reported for that crop. This was determined from least sig-
nificant difference values, using the lowest number of replicates
in the comparison.
 Cabbage.-The data in Table 1 show the range and average
 composition of cabbage samples collected in the vicinities of
 Hastings, Winter Garden, Bradenton, Belle Glade and McIntosh.
 The outer leaves averaged higher in all constituents than did
 the heads but individual samples did not all follow this order.
 Phosphorus was more nearly equal in the 2 portions than were
 the other constituents.
 Analyses of cabbage heads show significant differences in pro-
 tein, calcium, magnesium and iron; samples from Bradenton
 were below average in protein and iron; and samples from Win-
 ter Garden, below average in iron. Samples from the Hastings
 area averaged higher in iron than those from Winter Garden
 and Bradenton.
 Analyses of cabbage leaves show significant differences in
 protein, calcium, magnesium, potassium, phosphorus and iron
 percentages between areas. Samples from Belle Glade were