Northeast Region Certified Crop Adviser (NRCCA) Study Resources

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In This Section

• Introduction
• PO 36 Definitions
• PO 37 Long term changes due to N application
• PO 38 Variable in lime requirements
• PO 39 Soil pH and nutrient availability
• PO 40 Liming increases soil pH
• PO 41 Variables in the neutralizing ability of liming materials
• PO 42 Lime application calculations
• PO 43 Heavy metal availability

Competency Area 5: Soil pH and Liming

PO 42. Calculate lime application rates to meet lime requirements.

Lime recommendations are given in 100% ENV.  To convert to lime recommendation for a particular liming material, some calculations must be done.

• Lime rate (tons/acre) = 100 x lime rate for 100% ENV (tons/acre) / ENV of material

• For example: soil test recommendation is 1.5 tons/acre of 100% ENV; limestone material has ENV = 70.3.  Thus:
• Lime rate (tons/acre) = 100 x 1.5 / 70.3 = 2.1 tons limestone/acre