Title: Effect of size and spacing of whole and cut seed on yield and returns from Sebago potatoes at Hastings, Florida
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 Material Information
Title: Effect of size and spacing of whole and cut seed on yield and returns from Sebago potatoes at Hastings, Florida
Physical Description: Book
Creator: McCubbin, E. N.
Publisher: Potato Investigations Laboratory,
Copyright Date: 1955
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Bibliographic ID: UF00076273
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: 135192082 - OCLC

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POTATO INVESTIGATIONS LABORATORY MIMEO REPORT 55-2


Effect of Size and Spacing of Whole and Cut Seed on Yield
and Returns from Sebago Potatoes at Hastings, Florida

E. N. McCubbin



Tests were conducted during 8 years from 1943 to 1953 to determine the best

size and spacing of whole and cut seed for the production of Sebago potatoes.

Results are briefly summarized in this report.

Cut seed pieces weighing 1, 1l and 2 ounces each were planted 14, 12, 10, 8

and 6 inches apart in 40-inch rows from 1943 to 1946. Whole and cut seed of these

sizes were planted 12, 10 and 8 inches apart in 40-inch rows in 1949, 1950, 1952

and 1953. Treatments were replicated 5 to 8 times in 25-foot single row plots.

The plots were fertilized uniformly each year and cultivated and sprayed or dusted

in accordance with current recommended practices for commercial production of

potatoes in the Hastings Area.

Average yields of U.S. 1A and 1B potatoes from cut seed weighing 1, li and

2 ounces each at spacings of 12, 10 and 8 inches in the row are given on page 2.

Returns from these potatoes after subtracting certain expenses--the cost of seed,

picking-up, hauling, grading, packaging and selling the crop--also are shown on

page 2, The yield of both U.S. 1A and 1B potatoes increased as size of the seed

increased and as the seed of a given size were spaced closer in the row. Returns

for: the potatoes above the specified expenses also increased generally as size of

the seed used was increased and as the seed of a given size were planted closer in

the row to 8 inches.

Results with whole seed were the same as those obtained with cut seed.









Effect of Size and Spacing of Cut Seed on Yield and Returns From
From 1943 to 1953.


14,.454 per hundred-pound
cutting, 1947-1952.


Potatoes Grown


sack, estimated average cost of seed including $0.244 for


2)0,924 per hundred-pound sack, average cost of picking-up, hauling, grading,
pac'!fing and selling potatoes, 1947-1952,
353$':. and $2.52 per hundred-pound sack, average F.O.B. price for U.S. 1A and
JS9. 13 potatoes at Hastings, 1944 to 1953 inclusive.
4Returns after subtracting seed, picking-up, hauling, grading, packaging and sell-
ing costs.
5Nurber of years tested.

Cost figures 1 and 2 supplied by D. L. Brooke and Ao H. Spurlock,
Depart.mnet of Agricultural Economics, Florida Agricultural Experi-
ment Station,


Seed Seed Seed Average Yield Costs er Acre- Returns per Acre
Size Spacing per per Acre Seed & Digging, Above
Ounces Inches Acre U.S. 1A U.S. 1B Cutting Handling Gross3 Specified
Seed1 & Selling2 Expenses4
100-lbs. 100-lbs. 100-lbs, Dollars Dollars Dollars Dollars
8 12.3 132(5)5 18(5)5 54.78 138.60 539.04 346
1.0 10 9.8 107(4) 15(4) 43.65 112.73 437.98 282
12 8.2 98(5) 13(5) 36.52 102.56 399,28 260
8 18.V 163(7) 21(7) 82.40 170.02 662.54 410
1.5 10 14.7 157(7) 16(7) 65.47 159.95 627.50 402
12 12.3 154(7) 14(7) 54.78 155.23 611.24 401
8 24.6 187(8) 23(8) 109.57 194.04 757.34 454
2.0 10 19.6 169(7) 20(7) 87630 174.64 682.46 421
12 16,4. 167(8) 17(8) 73.05 170.02 667.42 424
Ave. 8 18.5 161 21 82.40 167.24 655,06 405
of 3 10 14.7 144 17 65.47 148.76 581.40 367
.sizes 12 12.3 140 15 54.78 142.30 561.40 364

1.0 Average 10.1 112 15 44.99 118.27 456.68 293
1o5 of 3 15.2 158 17 67.70 161.70 633.76 404
2.0 spacings 20.2 174 20 89.97 179.26 701.16 432











RECOMMENDATIONS


On soils which combine the best characteristics and conditions for high potato

production, it is recommended that 2-ounce seed be planted on an 8-inch spacing

in rows 40 inches apart. This will require 24.6 hundred-pound sacks of seed per

acre. Soils more acid than pH 5.0 should be limed to pH 5.3 to 5.5 before plant-

ing. The crop should receive 2,200 to 2,500 pounds of a 6-8-8 fertilizer per acre

or its equivalent. Enough canals, field ditches and water furrows should be pro-

vided to remove water rapidly after excessive rainfall. Potatoes must be sprayed

as needed to control early blight, late blight and insects; and irrigated when

necessary in periods of dry weather.

On soils which are less productive because of inherent factors that render

them below average in potato production, it is recommended that the present seeding

rate of 14 to 15 hundred-pound sacks of seed per acre be continued, This will

necessitate the use of seed weighing approximately 1 ounces each spaced 10 to 12

inches in rows 40 inches apart. Liming, fertilization, irrigation, drainage and

disease and insect control practices should be the same as those used in growing

pctatoew on the better soils.

Whole U.S. 1B seed tubers may be used in place of U.S. 1 seed potatoes cut in-

to seed pieces, when the cost of such seed and preparing it for planting does not

exceed that of the latter.



Note: Complete results of these tests have been submitted for

publication as a bulletin of the Florida Agricultural Experiment
Station




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