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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)

Crop productivity responses to BMPs,   pp. 6-18 PDF (4.8 MB)

Page 8

The BMP disease management program resulted in equivalent
amounts of fungicide being used at Fields A and C. However, the BMP
program saved three fungicide applications at Field B. Finally, the
BMP program saved 1.4 inches of irrigation (a 12% reduction) at Field
A and 1.5 inches (a 8% reduction) at Field B. Irrigation amounts were
the same at Field C.
3. Energy Inputs
The reduced inputs associated with the BMP program also had the
desired effect of reducing energy inputs and input costs. The energy
reductions (Table 3) reflect energy savings in the manufacture and
application of these inputs.  As expected, Field B had the greatest
energy savings since the BMP program resulted in the greatest
reduction of production inputs.
Table 3. Input Energy Differences - 1988 BMP Demonstrations
Energy Diff. 1000 BTUs/A - BMP from Grower i/
Input            Field A          Field B          Field C
Nitrogen        -1,254           -1,344            -11,290
Herbicide          -24              -21
Insecticide*       +87             -250
Fungicide                          -232
Irrigation        -265             -273
Total           -1,456           -2,120            -1,290
1/ BMP used + (more than), - (less than) or = (same as) the
grower program.
As Table 3 indicates, energy savings due to the BMP programs
ranged from 1.3 to 2.'2 /million BTUs per acre. Data for total energy
inputs used by the cooperating growers was not obtained. However, it
is estimated that some 15.3 million BTUs of energy inputs are required
to produce one acre of irrigated potatoes. This estimate is based on
potato crop budget information prepared by UWEX-CES Agricultural
Economists. Based on this 15.3 million BTU value for total energy
inputs, the following percent energy savings were realized; 9% at
Field A, 14% at Field B and 8% at Field C.
4. Input Costs
The reduction of production inputs, due to the BMP program, also
resulted in some cost savings. These cost savings, in Table 4, were
attributed to reductions in inputs and reduced application costs.
The input cost reductions were minimal for Fields A and C. but
were significant for Field B. While actual total cost data wsot
obtaie Ud  the cost reduction for Field B may    Wav    -ah-d-
based on a total input cost of $687 per acre (this estimate do
not include such fixed costs as land, management etc.).   However, 1cost}

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