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EFFECT OF FLOATING ROW COVERS ON RUSSET BURBANK
POTATOES AT REDMOND, OREGON IN 1987
J. Loren Nelson and Steven R. James
Central Oregon Experiment Station
Oregon State University
Redmond, Oregon
ABSTRACT
Number and size of tubers/plot and yield of Russet Burbank
potatoes were evaluated from replicated plots covered the
full season with Agronet and Agryl P 17 at Redmond Oregon
in 1987. Response of non-covered control) and Agronet
covered potatoes were similar. However total tuber yield,
yield of No. 1 tubers yield of 6-12 and > 12 oz. tubers
and average tuber size was significantly lower from Agryl P
17 covered plants compared to the other two treatments. The
covers were not evaluated for control of insects or dis-
eases. Agryl P 17 developed holes by mid-season compared to
none for Agronet. Cover durability is necessary to exclude
insects.
INTRODUCTION
Many different kinds of plastic materials have come into
widespread use in world agriculture to improve yield and/or
quality of vegetables (1). Materials used to cover plants
may be either supported, for example, with metal hoops, or
laid directly on the plants in which case the plants push or
raise the cover during growth. These later covers, called
floating row covers, are very light but some cause high tem-
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cool, short growing season area, to begin data collection of
cover effects on potato growth.
MATERIALS AND METHODS
The study was conducted at Redmond, Oregon on Oregon State
University nuclear VT-SC Russet Burbank potatoes planted May
14, 1987, in rows 36 inches apart. A 19-14-15-06 fertilizer
at 1100 lbs/A was banded at planting. Agronet, a UV stabi-
lized extruded film/net of polypropylene and polyamide, and
Agryl P 17, a nonwoven spunbonded polypropylene material,
were placed on 9 x 30 foot plots on June 2 for comparison to
a non-covered control treatment. The potato plants were be-
ginning to emerge. The three treatments were replicated
four times in a randomized complete block design. Each
cover was 21 feet wide by 40 feet long which allowed for
full potato vine growth without restriction. The covers
were removed for hilling on June 19. Covers on the center
row of plots were removed July 8 and 27 when Metribuzen (.25
lb ai/A) was applied for weed control. No Temik was applied
for insect control except by accident on Agryl P 17 covered
plot in replicate four. Potato plants were dusted with Sevin
for Colorado potato beetle control when needed. The experi-
ment was irrigated as needed. However from July 20-25
nearly 3.5 inches of rain occurred with water standing for
sometime on the plots. Plants in replicate four may have
been adversely affected because this was the low part of the
field and water remained on these plots for a longer time.
Covers were left on plots until shortly before harvest on
October 14. Twenty-five feet of the center row of each plot
was dug for yield, number, and tuber size determinations.
Data were analyzed statistically. Neither plants nor tubers
were tested for virus infection.
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Agronet according to Hemphill (2) and Reed (3). No temper-
ature data were collected in this experiment. However,
there was burning on the margin of many potato leaves two to
three weeks after shoot emergence under Agryl P 17 but none
was observed on leaves under Agronet. Hemphill found that
row covers reduced the number of tubers and total yield for
Norgold potatoes but only Agryl reduced the mean tuber
weight. Reed found substantial reductions for the later
maturing cultivar Butte . He also reports that Hemphill
obtained a slight increase in tuber numbers and total weight
per acre in 1987. Reed hypothesis that covers could be a
positive factor in the cooler portions of Oregon devoted to
seed production. However one year (1987) results on Russet
Burbank potatoes at Redmond did not show this. The sugges-
tion by Hemphill that row covers might be more effectively
utilized on very early plantings with covers removed at the
onset of hot weather appears to be more plausible. Future
research should be conducted to define the benefits of, row
covers for the production of disease free potato seed in the
cool central Oregon region.
REFERENCES
1. Hemphill, Jr., D.D. and N.S. Mansour (Editors). 1987.
Proceedings of the Twentieth National Agricultural
Plastics Congress, August 25-27, 1987. Portland, Ore-
gon. 292 pp.
2.
Hemphill, Jr., D.D. 1987. Floating row covers reduce
virus transmission to potato seed stock.
n Veg-
etable Research at the North Willamette Agricultural
Experiment Station 1985-1986. Oregon State University
Agricultural Experiment Station Special Report 798.
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