Em4885 irrigation management practices to protect ground water

4 CHAPTER
4. Toxic materials content. Sewage sludge can sometimes contain heavy metals and
other toxic materials. Sludge applications are regulated. Contact your local health
department.
Contact a reputable agricultural laboratory for testing. Either contract with their
technicians for the sampling or follow their directions in obtaining the samples yourself.
Table 4-3 from WSU Cooperative Extension
bulletin EB1719, Animal Manure Data Sheet,
(Revised May 1994) lists the amount of fertilizer
nutrients in fresh manure per animal. Note that
not all of the nutrients are available to the plant.
Pacific Northwest Extension bulletin PNW239,
How to Calculate Manure Application Rates in the
Pacific Northwest, is available as an aid in the
proper use of manure. It is being replaced by a
computer model, Manure Nutrient Balancer.
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