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Chapter 4.2

Manure book values may not reflect the •

nutrient composition of individual farms because nutrient composition varies widely. The only way to get reliable, farm specific estimates of manure nutrient content is by sampling and lab analysis. Changes in manure composition with •

time can be addressed by sampling as close to the time of application as possible. Differences in nutrient content throughout a manure pile can be addressed by using proper sampling procedures. To obtain a representative manure sample, •

collect manure from throughout the storage or throughout the application process. Sample liquid manure only after thorough agitation.

Ensure that samples sent for analysis are •

handled appropriately: fill liquid manure containers only two-thirds full, keep samples cool, transport samples within a day and clearly label all samples. The key analyses to request from the testing •

facility include: moisture content (or dry matter/total solids content), total N (Total Kjeldahl Nitrogen), NH

4

-N and total P.

summary