Group Title: Indian River Field Laboratory mimeo report
Title: Results of potato fertilizer experiments in the Indian River area
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 Material Information
Title: Results of potato fertilizer experiments in the Indian River area
Series Title: Indian River Field Laboratory mimeo report
Physical Description: 3, 1 leaves : ; 28 cm.
Language: English
Creator: Hayslip, Norman C ( Norman Calvin ), 1916-
Burdine, Howard W., 1909-
Hortenstine, Charles C ( Charles Carpenter ), 1919-
Indian River Field Laboratory
Publisher: Indian River Field Laboratory
Place of Publication: Fort Pierce Fla
Publication Date: [1960]
Subject: Potatoes -- Florida   ( lcsh )
Potatoes -- Fertilizers -- Florida   ( lcsh )
Genre: non-fiction   ( marcgt )
Statement of Responsibility: N.C. Hayslip, H.W. Burdine and C.C. Hortenstine.
General Note: Caption title.
General Note: "May 3, 1960."
General Note: "A revision of Mimeo report 59-3."
 Record Information
Bibliographic ID: UF00056011
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 69244467

Full Text


The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source

site maintained by the Florida
Cooperative Extension Service.

Copyright 2005, Board of Trustees, University
of Florida

Indian River Field Laboratory .Iimeo Report 60-2
(A revision of INimeo Report 59-3) MIy -3~.960


N. C. Hayslip, H. W. Burdine and C. C. Hortenstie 0

Five potato fertilizer experiments/ have been conducted, one for each
of five consecutive years beginning irth the 1955-56 season. Four of these
experiments were grown during the mid-winter season, planted in late November
or early December and harvested in March. The experiment reported for the
1957-58 season was planted January 30 and harvested ,ay 10, 1958, after a
previously planted experiment was lost.

Soil Types: The soil types on which these experiments were conducted were
designated as Immokalee or Leon fine sand.

Previous Cropping: Four experiments were conducted on land that had been pre-
viously cropped one or two years to potatoes and/or tomatoes followed by cover
crops of sesbania. The fifth test (1959-60) was planted on land previously
cropped to tomatoes and potatoes, but no cover crop was planted.

Nutrient Sources:
Primary elements: All treatments receiving organic nitrogen were made
with commercial mixtures being used by growers containing 40% nitrogen derived
from castor pomace and tanlage with the exception of those used during the
1958-59 season. The organic nitrogen component in this experiment was 50%
and derived from Iilorganite, mixed at the Everglades Experiment Station.

In all other treatments fertilizers were mixed at the Everglades Station
from the following materials:
Ammonium nitrate
20% Superphosphate
luriate of Potash

Secondary elements: Where commercial mixtures containing organic nitro-
gen were used, secondary elements including magnesium were applied in profor-
tions being used by the grower. In all other mixtures, secondary elements were
used as follows:

Material LbsA
Copper Sulfate 1.0
manganese Sulfate 12.5
Zinc Sulfate 9.0
Ferrous Sulfate 21.0
Borax 8.0
Magnesium Sulfate 150.0

I/ Entomologist, Indian River Field Laboratory, Fort Pierce, Florida; Assistant
Horticulturist and Assistant Soils Chemist, Everglades Experiment Station,
Belle Glade, Florida, respectively.

2/ The writers wish to acknowledge the cooperation and assistance of Tom
lehlenbacker, Irwin Hopkins, John Baum and L. R. Becker who assisted with
these experiments.

Application of Iaterials:
Banded at planting: Two bands of fertilizer were applied 3. to 4 inches
on each side of the seedpieces.

Later banding: A furrow on each side of the ridge approximately 2" deep
was marked out about halfway up the ridge on each side. Fertilizer was applied
and furrow covered with soil. In 1955-56 fertilizer was applied to side of

Broadcast at planting: Fertilizer was broadcast over the entire plot
area before ridging.


Weight in pounds per plot was converted to number 100-1b. bags per acre.
These yields include both U. S. Yl and U. S. #2 size potatoes.


Table 1 lists thirteen treatments applied during a four-year period.
Treatment 8 probably approximates more nearly that followed by most growers
in the area. Table 2 summarizes the nitrogen and potash rate and ratio test.

1. Split versus single fertilizer applications compare treatments 1
and 3, Table 1. These treatments containing equal amounts of nutrients were
very similar in response yieldwise the last three years. The first year, how-
ever, 1955-56, the "all at planting treatment" was significantly greater.

2. 6-8-8, 2500 Ibs. per acre with extra sidedresses of nitrogen and
potassium compare treatment 1 to treatments 5, 6 and 7, Table 1. The 1955-56
plot indicated what was subsequently observed in 1957-58, that more than one
extra sidedress of nitrogen and potassium at the rates given tended to delay
maturity and reduce yields. However, one extra sidedress applied about 2" deep
on each side of the ridge not later than 6 weeks after planting and containing
60 Ibs. nitrogen and 60 Ibs. potash, consistently gave highest yields that were
significantly greater two years out of four. It is estimated that the cost of
600 Ibs. of 10-0-10 required for this application is about $16.00.

3. Organic versus mineral nitrogen compare treatment 1 with treatments
8 and 10 and treatment 4 with treatment 9, Table 1. Comparisons were made in
each of four years. These data indicate that organic nitrogen did not increase
yields in any of the four years. In 1955-56 the organic nitrogen plots yielded
significantly less than plots receiving all mineral nitrogen.

4. Uinor elements versus no minor elements compare treatment 1 with
treatment 12 and treatment 5 with treatment 13, Table 1. These plots were
grown on soil that had been previously cropped at least one year and usually
with a two-year cropping history. Yields were somewhat lower with treatments
involving *!6 minor elements but differences were not large enough to be signi-
ficant. The routine addition of certain minor elements provides insurance.
However, on land having been already cropped for two years with routine appli-
cations of minor elements, the value of annual applications of zinc and
manganese in fertilizer mixes might be questionable if both maneb and zineb are
both used as fungicides.


5. Broadcast versus band compare treatment 1 with 4 and 8 with 9,
Table 1. These data are limited, however, band application seems preferable
to broadcast.

6. Side-dressed applications of nitrogen and potash applied separately
or in combination resulted in increased yields, however, these differences
were not significant (Table 2).

7. General comments: Yields were rather low in several of these experi-
ments. However, it seems from these data that where higher yields are expected
2500 Ibs. of 6-8-8 could be profitably supplemented by 400 to 600 Ibs. of
10-0-10 or 300 to 400 Ibs. of 15-0-14 per acre applied not later than 6 weeks
after planting, especially if leaching rains have occurred since the original
fertilizer application.

Considerable data have been accumulated at the Potato Investigations
Laboratory at Hastings and much of this information should be of value to
south Florida sandy soil potato growers.

See next page for Table 1.

Table 2. The effect of nitrogen and/or potash sidedressing on the yield of
Sebago potatoes.

Nitrogen Potash Added
Added 0 40 Ib./A 60 Ib.A Average
100 Ib. begs/A 100 Ib. bags/A 100 lb. bags/A 100 Ib. bags/A

0 204 225 215 215

40 ibs./A. 222 236 221 226

80 Ibs./A. 221 226 229 225

Average 216

229 222



Treatment-Lbs ./A
N P205
1. 150 200
2. 90 200
3. 90 200
60 o
4. 140 200
5. 150 200
60 -
6. 150 200
60 -
60 -
7. 150 200
60 -
60 -
60 -
8. 150 200
(4o0 orgar
9. 150 200
(40% org.
10. 168 280
(6-8-10 Cc
11. 150 200
+1000# ac.
12. 150 200

ere tlinor
K20 Elen. How Applied
200 yes Band-all at plant.
140 yes Band-all at plant.
140 yes Band at plant.
60 Band 6 wks. after
200 yes Broad-all at plant.
200 yes Band at plant.
60 Band 6 wks. after
200 yes Band at plant.
60 Band 6 wks. after
60 Band 8 wks. after
200 yes Band at plant.
60 Band 6 wks after
60 Band 8 wIs. after
60 Band 1. wks. after
200 yes Band-all at plant.
ic N) (50% org. N in 1958-59)
200 yes Broad-all at plant.
N) (50% org. N in 1958-59)
224 yet Band-all at plant.
)m. Mix. 40% organic 2800o ac.)
200 yes Band-all at plant.
gypsum broad. before ridging
200 I Band-all at plant.

Becker Ranch
1000 bgs/A Rank
179 (2)

175 (4)
175 ()



Becker Eanch
100# bgs/A Ran1k

Baum Farm
100 bgs/A Rank
202 (4)

181 (6)

Becker Ranch
100M bgs/A IRan
101 (3)
89 (6)
107 (2)














88 (7)



98 (5)

200 Ng Band at plant.
60 only Band 6 wkts. after

ISD: .05 = 11



ISD: .05 = 20

IIFL 60-2
500 copies

13. 150


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