Virginia
Valencia
Spanish
Natal Common
Kongwa Bunch
Mean
Planting
III. Performance
values (yield per
1,000 plants) lb.:
December 24
January 2
...
January 14
January
28 ...
Mean
A WAAN
72
54
48
68
79
62
45
53
51
57
57
48
42
44
31
31
37
30
ww
36
40
Aug
53
25
27
30
43
48
44
46
51
47
IV. Time from plant-
ing to maturity,
days:
December 24
106
106
106
126
126
115
January 2
107
107
107
118
118
111
...
January 14
104
126
126
126
130
124
...
January 28
103
114
114
130
130
121
Mean
105
113
113
125
126
118
V. Oil percentage,
per cent. kernels:
December 24
44.5
47.4
47.1
40.5
42.9
•
44.5
January 2
45.8
48.4
48.3
39.3
45.1
45.4
January 14
47.0
47.0
45.8
38.5
42.9
44.2
January 28
45.1
45.6
44.4
39.1.
43.8
43.6
Mean
45.6
47.1
46.1
39.4
43.7
44.4
VI. Oil yields, lbs.
per acre:
December 24
248
611
560
663
637
544
..
January 2
502
. 614
514
486
469
517
January 14
327
423
471
267
269.
351
January 28
358
146
244
147
203
220
Mean
359
448
447
391
394
408
201
Section I of this table shows a considerable variation in the populations actually established. The reasons for fluctuations in the Valencia figures, par- ticularly the low population achieved on December 24, are not fully explained.
The exceptional decline in establishment of Spanish Bunch at the last date accords with general experience at Kongwa, which suggests that this variety is more sensitive to dry conditions at or after planting than the others tested. The fairly uniform establishment of Kongwa throughout, by comparison with other types, may reflect an adaptation to dry conditions, although the quality of the seed was poor, leading to a generally lower population level. The yields (section II) are strongly influenced by plant population, so that section II cannot be interpreted alone. The behaviour of the varieties is best illustrated by the somewhat crude device of calculating performance values (yield per 1,000 plants), in section III. In the absence of information on the variation of performance values with population (which may be expected in general to have a sigmoid form), this procedure is evidently somewhat questionable, but it does appear to give a somewhat better picture of the essential differences in the reaction of the varieties to varying planting dates, than can be obtained by the direct examination of the yield data. The main error introduced is probably in the direction of overstressing the significance of the high perform- ance value for Valencia on December 24.
·
In general, the longer season requirements of the less upright types would seem to be well demonstrated. These types are potentially higher yielders than the upright types, provided they are planted early; but mid-season plantings rob them
Pagtig advantages
thei ages in this respect, while at 84 ans dates
139
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