Florida Agricultural Experiment Station


follow any definite trend that could be correlated with the treat-
ments. Kernel percentages did not vary greatly, and were low
for several sizes of nuts.
 Therefore, an examination of the data in Table 5 will show
that there were no consistent differences in sizes of Frotscher
and Stuart nuts produced under different treatments during the
two periods of the experiment, although there were some varia-
tions.
 By referring to Table 5 it will be noted further that the
 greatest variation occurred with the Frotscher during 1928-
 1931 when there were light nut yields in all years except 1928.
 During this period the percentage of nuts sizing 15/16 inch
 were much higher in Plots 1 and 2 in which legumes were grown
 during winter and summer. This was due no doubt to a more
 favorable moisture condition in the soil maintained by the mulch
 produced by the winter legumes. The kernels on a percentage
 basis did not vary consistently when examined collectively, and
 the quality was characteristic of the two varieties.

 EFFECTS OF COVER CROPS ON ORCHARD RETURNS

 In Table 7 and in Fig. 16 average annual returns are shown
 for the different plots covering the first and second periods,
 as well as for all years that the experiment was conducted. The
 price of fertilizers and seed was based on cost of these materials
 from 1927 to 1934 and averaged. Cultivation was the same
 in all plots and, therefore, it was not charged for as it was not
 materially changed from that practiced by the grower prior
 to the time the experiment was initiated. The value of each
 crop was calculated from prices at which the nuts were sold
 by the grower, and averages are shown for the two periods
 separately.
 The average annual cost of materials to produce each pound
 of nuts was higher during 1928 to 1931 than 1932 to 1934, ex-
 cept with the Stuart in two instances. It will be noted in Table
 7 that legumes in winter and summer produced Frotscher nuts
 at the lowest cost for fertilizer and cover crop seed during 1932
 to 1934. The Stuart, however, with the same cover crops cost
 more per pound of nuts because of the lower production. Table
 7 also shows that the nuts which cost the most during 1932 to
 1934 were produced by the Stuart where oats and Crotalaria
 spectabilis, respectively, were grown during the winter and
summer and sulfate of ammonia was applied annually.