Table 9. Rainfall in millimeters, by month at the Agronomy Farm and the
 Green Acres Farm, 1978-1980, Gainesville, Florida, USA.
 AGRONOMY FARM
 Month/Year 1978 1979 1980
 mm. mn. mm.
 January 157 255 157
 February 126 85 48
 March 115 30 75
 April 16 208 106
 May 88 85 129
 June 99 116 58
 July 263 112 220
 August 245 188 81
 September 06 311 94
 October 12 03 43
 November 02 34 51
 December 122 155 07

 Annual Total, mm 1251 1582 1069
 GREEN ACRES FARM
 1978 1979 1980
 mm. mm. mmn.
 January --- 230 140
 February --- 59 25
 March 101 34 127
 April 09 172 135
 May 94 106 159
 June 99 113 96
 July 269 189 238
 August 125 170 126
 September 17 249 32
 October 01 05---
 November 64 39
 December 53 125

 Annual Total, mm --- 1491
 Data courtesy Dr. Darrell E. McCloud, Professor, Agronomy Department, IFAS,
 UF, and Mr. Rick Hill, Lab Technologist at the Agronomy Farm and to Dr. Al
 Norden, Professor, and Mr. Harry Wood, Agricultural Technician at the Green
 Acres Farm.


 Table 9. Rainfall by month at Agronomy and Green Acres
Farms, 1978-1980. The rainfall amounts and distribution were
such that no irrigation water really needed to be applied to
sunflower. However, in 1978 each test received irrigation water as
follows: 14 March-100 mm; 13 April-51 mm; and 17 August
- 38 mm. To the author's knowledge, no Florida sunflower field,
experimental or commercial, has ever suffered from a lack of
natural moisture in the form of rain. However, in dry years or
seasons, sunflower yields should be enhanced by judicious ap-
plications of irrigation water. Farmers should be prepared for this
eventuality.


 Table 10. Solar Radiation: Photosynthetically Active Radiation (PAR) and
 Total Radiation (TOTAL) recorded at the Main Station Agronomy
 Farm, 1977-1980, Gainesville, Florida. By Month.
 Photosynthetically Active (PAR) and Total Radiation/
 1977 1978 1979 1980
 PAR2 TOTA PAR2 TOTA PARK TOTA PAR2 TOTA
 Month E/M MJ/M E/M MJ/M E/M MJ/M E/M MJ/M
 January ---- ---- 664 341 631 316 644 298
 February -- ---- 651 325 669 333 822 380
 March ---- ---- 1030 515 1112 564 974 462
 April ---- ---- 1347 688 1151 574 1215 594
 May ---- ---- 1349 668 1335 663 1309 633
 June ---- ---- 1259 610 1247 614 1280 624
 July ---- ---- 1180 567 1336 655 1338 644
 August 1219 562 1227 606 1170 568 1320 633
 September 1138 551 1044 515 804 425 1084 521
 October 976 496 901 448 976 517 862 437
 November 682 316 702 347 805 364 635 325
 December 554 291 602 298 652 304 624 317
 ................- ..------------------------------------------------- -
 TOTAL ---- ---- 11,956 5,928 11,888 5,897 12,109 5,866
 1/ E/M2 = Einsteins per square meter; MJ/M = megajoules per square meter.
 To nearest unit.
 Data furnished by Dr. D. E. McCloud, Professor (Agronomist) IFAS, University
 of Florida, Gainesville. Mr. Rick Hill, Observor. PAR recorded with a Licor
 Quantum Sensor and integrator. Total radiation measured with an Eppley
 Pyronometer and recorded on a Kipp and Zonen integrator.


 Table 10. Solar radiation, Main Station, 1978-1980. Both
photosynthetically active radiation and total radiation are shown
in this table. These figures should be equally applicable at both
farms located at about the same elevation and eight miles apart.



 Table 11. Disease ratings for Alternaria helianthi, Green
Acres, August 1979 test. To chart the progress of the Alternaria
leaf and stem black spot disease, these data were gathered and are
shown to accompany Figure 1. The number of active leaves re-
maining on the plants as averages for the cultivars on 31 October
are shown along with the dates of physiological maturity in
November 1979. The active leaves were usually the upper leaves
of the plants capable of photosynthesis since the disease begins
on the lower, older leaves and proceeds upward on the plant.


Table 11. Disease ratings after flowering over 5 dates and the number of
 active leaves remaining on the plants of 6 commercial sunflower
 confection hybrids, Green Acres Farm, Gainesville, FL 1979.

 Index of Disease Number of Date of
 on the indicated Active Physio-
 Acc. Date Leaves logical
Designation Brand Hybrid 10/1 10/8 10/15 10/22 10/29 Oct. 31 Maturity,
 Nov.

C-7 Sheyenne 853 0.8 2.6 4.4 4.7 4.9 8.7 10


C-9 Sheyenne 923 0.7 2.3 3.9 3.9 4.3 13.5

C-12 Sigco 924 1.1 2.8 3.7 4.5 4.6 10.8

C-13 Dahlgren D-820 0.3 2.3 4.0 4.5 4.5 10.7


Dahlgren D-933 0.3 2.2 4.4 4.8 4.8


C-15 Dahlgren D-716 0.6 2.5 4.8 4.8 4.8 7.7 8

Mean 0.6 2.5 4.2 4.5 4.7 9.9 10

Test planted 16 August 1979.
Disease index for Alternaria helianthi 0.0 = disease free to 5.0 = epiphytotic
Active leaves are those still remaining on plants and capable of photosynthesis.


PROCEEDINGS of the CARIBBEAN FOOD CROPS SOCIETY-VOL. XX


12

11

11


C-14


8.1 9


126