Water quality
285
Table
1.
Results
of experiments on fertilization of sunfish ponds.
Fertilizers were applied 11 times during each growing season.
Treatments were replicated 3 to 6 times for the different
experiments.
Fertilizer
Application rate
Sunfish
grade
Type
(kg/ha)
(kg/ha)
Reference
None
—
0
112
Boyd (1981b)
20— 5—5
Granular
45
'
80
Dobbins and Boyd (1976)
20—10—5
Granu1ar
45
198
—Same—
20—15—5
Granular
45
210
—Same—
20—20—5
Granular
45
270
—Same—
20—20—0
Granular
45
220
—Same—
20—10—5
Granular
45
332
Lichtkoppler and Boyd
(1977)
20—20—5
Granular
45
360
—Same—
0—20—5
Granular
45
210
Boyd and Sowles (1978)
20—20—5
Granular
45
238
—Same—
13—38—0
Liquid
5.6
310
Metzger and Boyd (1980)
13—38—0
Liquid
11.2
315
—Same—
13—38—0
Liquid
22.4
418
—Same—
20—20—5
Granular
45
228
Boyd (1981b)
0—40—0*
Granular
20
298
—Same—
0—46—0*
Granular
10
226
—Same—
18—46—0*
Granu1ar
10
308
—Same—
______________________________________________________________.......-.—
*Triple superphosphate
**Diammonium phosphate