Page 5


Table 9. Percent of plants with blackheart.


pH at
Harvest
 6.24
 5.53
 5.20


Summer
Pascal
 1.3
 8.5
 19.2


Utah
52-70
 1.1
 2.8
 6.6


FFVA
2-13
0.0
1.9
4.2


Fla.
683
0.0
1.0
1.9


 Blackheart percentages increased with decreasing pH. Summer Pascal was
the most affected. Fla. 683 had significantly less blackheart than FFVA 2-13.


Number of cracked petioles on 30 plants.


Summer Pascal
 Boron
Check Spray
 33 16
 23 6
 15 16


 Utah 52-70
 Boron
Check Spray
 68 15
 45 35
 26 17


 FFVA 2-13
 Boron
Check Spray
127 77
 80 84
 81 72


 Fla. 683
 Boron
Check Spray
 5 6
 10 6
 9 6


 Both pH effects and variety differences were highly significant. Boron
sprays decreased rib .cracking at the higher pH level but not at the two lower
levels.

Table 11. Phosphorus content of outer rib tissue, percent of dry weight.


 pH at
.Harvest
 6.24
 5.53
 5.20


 Summer
. Pascal
 .55
 .61
 .61


Utah
52-70
 .61
 .67
 .69


FFVA
2-13
.58
.68
.67


Fla.
683
.61
.64
.69


 The Utahs contained significantly higher P than Summer Pascal, and Fla.
683 more phosphorus than FFVA 2-13.

 The difference in the magnitude of the calcium found in the samples
tabulated below, and the former experiments was due to the location on the
plant of the samples taken. The former samples were taken from flairing outer
ribs just before harvest. The following data were taken from outer rib samples
remaining after field trimming during harvest. The ribs are younger than those
of the former experiment. Consequently, calcium content is in a lower range.
The important point, however, is the differences found between treatments and
varieties within each experiment.

Table 12. Calcium content of outer rib tissue, percent of dry weight.


pH at
Harvest
 6.24
 5.53
 5.20


Summer
Pascal
1.15
1.16
1.15


Utah
52-70
1.58
1.35
1.27


FFVA
2-13
1.45
1.39 .
1.24


Fla.
683
1.56
1.43
1.42


 Calcium content of petiole tissue was higher for the Utahs, and Fla. 683
contained more calcium than FFVA 2-13.


Table 10:


pH at
Harvest
 6.24
 5.53
 5.20