Northeast Region Certified Crop Adviser (NRCCA) Study Resources

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In This Section

• Introduction
• PO 25 Plant nutrient sources
• PO 26 Form and analysis of nitrogen sources
• PO 27 Form and analysis of phosphorous sources
• PO 28 Form and analysis of potassium sources
• PO 29 Form and analysis of calcium or magnesium sources
• PO 30 Commercial fertlizer terms
• PO 31 Nutrient terms
• PO 32 Calculating fertilizer application rates
• PO 33 Calculating manure application rates
• PO 34 Fertlizer placement methods
• PO 35 Certifiable organic nutrient sources
• Summary

Competency Area 4: Nutrient Sources, Analyses, Application Methods

Summary

• Starter fertilizer selection combines many issues.
• The composition of applied fertilizers should be based on the fertility status of the whole farm.  The only way to really know the status is to have a full set of soil samples!
• We can no longer ignore manure nutrient contributions, especially those that accumulate in the soil year after year.
• We can no longer guess at soil fertility any more than we guess at forage samples – we now have the ability to make more informed decisions based on soil samples and other data.
• Use fertilizer imports to SUPPLEMENT, not SUBSTITUTE for on-farm nutrients.