The results were as follows:-
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Page 378
Table 17.-Kernel Yield (lbs. per acre), Oil Percentage and Oil Yield
(lbs. per acre), Groundnuts, Experiment 5, Kongwa, 1947-48
Mean
Main effect N
P
K
L
Interaction NP
NK
PK
NL
PL
KL
S.E., main effects and interactions
Variety: Valencia
Kernel yields (lbs. per acre)
Oil content
per cent.
Oil yield (lbs. per acre)
956
46.9
448.0
78
-0.2
33.7
228†
-0.3
104.2
73
-0.2
32.1
94*
-0.2
42.3
136+
-0.3
61.1
3
-0.1
--5
0.3.
-6.3
5.
M
-0.1
2.3
0.1
-29.0
-0.2
-13.3
+0.20
-59 -23
+35.7
In spite of large fertiliser effects on yield, those on oil content are small and not significant. The general tendency is for treatments to reduce oil content.
This question was further examined by the analysis of kernel samples from three experiments, Nos. 7, 15 and 17 (Table 13), on the rate of application of standard fertilisers. In these experiments considerable yield differences were obtained, although only one was significant. The results were as follows:-
Table 18.--Kernel Yield (lbs. per acre), Oil Percentage and Oil Yield (lbs. per acre), Groundnuts, Experiments 7, 15 and 17, Kongwa, 1947-48
No added fertiliser
46
Response to― ·
93
186 lb. fertiliser per acre
Standard
errors
(responses)
I. Experiment 7, Valencia.
Yield, lbs. kernels per acre Oil content, per cent.
627
-5
91
263*
+88.6
46.8
-0.5
-0.2
-0.3
±0.37
Oil yield, lbs./acre
294
6
38
.122*
+42.9
II. Experiment 15, Valencia.
Yield, lbs. kernels per acre
868
-17
155
164
115.3
Oil content, per cent.
46.2
0.5
-0.6
-0.6 +0.70
Oil yield, lbs./acre
401
3
64
72
55.1
III. Experiment 17, Spanish Bunch.
Yield, lbs. kernels per acre
949
-233
Oil content, per cent.
46.8
-1.0
56 -2.0*
101
+200.7
Oil yield, lbs./acre
445
-116
- 44
42
...
-0.4 ± 0.71
94.2
The samples had to be stored for some time before being analysed, and were slightly damaged by weevils while in store. This may account for the rather large depressions of oil content by fertilisers, and for the large standard errors.
Only in one case (Experiment 17) does a difference in oil content reach significance. In these experiments all but one of the fertiliser effects are negative, which reinforces the inference from Experiment 5. In all these experiments the effects apparently produced by fertiliser treatment are small compared with those associated with varietal differences (see p. 142).
* Effects of this size are not likely to arise by chance in more than 1 in 20 cases, † Effects this size are not likely to arise by chance in more thage 3780@asds097
of
136
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