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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 11

3. Energy Inputs
The energy input differences are indicated in Table 8.
Table 8. Input Energy Differences - 1989 BMP Demonstrations
Energy Diff. 1000 BTUs/A - BMP from Grower 1/
Input               Field A                  Field B
Nitrogen            -1,281                    +284
Herbicide              -99
Irrigation            -364                    -145
Total              -1,744                     +139
1/ BMP used + (more than), - (lessThan) or = (same as) the
grower program   k    j
The BMP program pro uced energy savings of 1.7 million
BTUs / acre. This repr sented about a 24% reduction in energy use when
compared to the estimated 6-7 million BTUs needed to grow a sweet corn
crop. As the data (Table 8) indicates, reduced nitrogen and
irrigation us      ided the largest energy savings. The BMP program
at Field B r qulTe@ in a net increase in energy use of about 7%.
This increase   s-attributed to the extra-nitrogen used by the BMP
4. Input Costs
The reduction of production inputs did reduce costs at Field A
while total costs were essentially the same at Field B. The cost data
is presented in Table 9.
The cost savings of $24/acre at Field A represent about 15%
reduction based on a total cost of $161/acre (does not include fixed
costs). As indicated in the 1988 potato results, the true measure of
the cost impacts of BMPs is the determination of the per unit cost.
Tbi   asno-t-done because of a lack of total cost data for thegrower
pogram.    oas with t e potatoes for FieM1dA (1988) , the BMP
program did reduce costs, but yields were also reduced. This may have
resulted in a higher per unit cost for the BMP program.

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