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Curwen, David; Kraft, George J.; Osborne, Thomas; Shaw, Byron H. / Demonstration of low input strategies for potato/vegetable production on irrigated sands
[DNR-059] (1989)

Site characteristics,   pp. 1-3 PDF (1.4 MB)


The BMP demonstration described,   pp. 3-6 PDF (2.0 MB)


Page 3

4)                                           V
layer over deep medium and coarse sand (USDA, 1978).   It is poorly
drained except near W*  ditches, such a   at Field A and has rapid
__ ma i2iy   Soils at Field B are mostly Richford loamy sand
(Psammentic Hapludalf, sandy, mixed, mesic) with a small area of
Plainfield loamy sand. They typically have a 5 to 7 inch surface
layer of brown loamy sand and about 30 inches of loamy sand subsoil
formed over sand and gravel (USDA, 1978).  The soils are well drained
with rapid permeability. The soils at Field C are primarily Chetek
sandyKloam (kEri~c Glossoboralf, coarse, loamy, mixed) which is a well
drained soil underlain by sand and gravel (USDA, 1958). All three
fields can be<Fi aTas having soil and subsurface characteristics
which are veryqv-Inerable to groundwater contamination (WDNR, et al.,
1987) . a< cuc-.  -C.YCA '                 i
The irrigation well serving Field A -we s_ lqp ated in the middle of
the demonstration field. The one at Field B w a2located on the
up-gradient (east) side of the field at its midpoint. The irrigation
well serving Field C wrs  located about one-quarter mile north of the
demonstration field. '5
The BMP Demonstration Described
This project demonstrated "best management practices" (BMPs)
for potato and process vegetable production on irrigated sands.
Potatoes were planted in all three fields for the 1988 growing season.
The Russet Burbank variety was grown at Fields B and C, while Russet
Norkotah was grown at Field A.  In 1989, Sweet corn was planted at
Field A, snap beans at Field B and red kidney beans at Field C. Field
C was included in the 1989 groundwater monitoring program but not in
the BMP demonstration.               I e_ ,
BMP programs were developed forotatoes, sweet corn and snap
beans.  The programs were-ased on research and were designed to
reduce fertilizer-nitrogen, pesticide and irrigation inputs. The BMPs
used were as follow:
Nitrogen Management
Crop variety grown, realistic yield goals and soil organic
matter were used in determining and minimizing the rates of fertilizer
nitrogen application for the BMP program. Since no field had a legume
crop the previous year, no nitrogen credits could be used to further
reduce fertilizer nitrogen. The BMP programs used split nitrogen
applications which were timed to maximize nitrogen uptake. The potato
BMP program also used petiole analyses to determine if mid-season
additions of nitrogen were needed.  Petiole analyses were not
available for sweet corn and snap beans.
Weed Control
The EMP weed control program was designed to minimize the use of
herbicides. Selection of herbicides was based on the anticipated weed
problems as indicated by past experience. When used, herbicides were
S


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