Page 398
A late-planted (15th March) sunflower variety trial at Kongwa gave the follow- ing results:-
Table 26.-Results of Sunflower Variety Trial, Kongwa Experiment Station
1947-48
Seed Yield
Oil Content
Variety
lbs./acre
Per cent.
Total Oil, lbs./acre
17
±0.51
+8.4
Sunrise
136
29.0
40
Advance Hybrid
170
29.9
51
Pole Star
263
29.0
77
Hungarian
348
28.6
101
Mean
229
29.1
67
Four inches of rain fell in the nine days after the planting of this experiment, and the total growth period was 112 days. A potash treatment incorporated in this experiment was ineffective, as judged by eye. Pole Star and Hungarian are evidently superior to the Canadian varieties, under these dry late-planted conditions.
The oil content and oil yields of certain sunflower varieties at Kongwa in 1947-48 were as shown in Table 27:
Table 27.--Seed Yield, Oil Content and Oil Yield of Sunflowers on Observation
Plots, Kongwa, 1947-48
Seed Yield, Oil Content
lbs./acre
Variety
Southern Cross
Jupiter
Pole Star
Saturn
Black seeded giant
Grey seeded giant
Hungarian
Hungarian
Hungarian
Hungarian
Hungarian
Oil Yield,
Per cent.
lbs./acre
770
26.4
205
778
28.2
219
1,255
28.6
362
1,153
26.6
307
450
26.8
120
650
26.0
167
1,317
28.3
373
1.162
28.6
332
•
232
26.7
62
•
502
25.9
129
205
29.2
60
...
It is to be noted that the yield values are not mutually comparable, since they are not derived from experiments but from scattered and mostly unrelated observation plots.
Co-operative studies on free fatty acid content and other characteristics of sun-
flower oil
The free fatty acid (FFA) and iodine values of the oil from samples of sun- flower seed were examined by Professor T. P. Hilditch as part of an investiga- tion into the possible advantages of heat treatment of sunflower seed before shipment (see p. 116).
Four samples were sent, all of the Hungarian variety, from a harvest in late July, 1948. The treatments were:
No heat treatment, sent by air No heat treatment, sent by sea Heat treated, sent by air
$1
$2
S3
$4
Heat treated sent by sea
Page 398
146
803