If the ECCE of a liming material is 65 and the lime recommendation for a state is based on material with an ECCE of 80, how should lime rate be adjusted for the material with an ECCE of 65?

To determine how to adjust the lime rate when using a liming material with an Effective Calcium Carbonate Equivalent (ECCE) value different from the base recommendation, it is important to understand what the ECCE represents. The ECCE is a measure of the neutralizing value of lime materials compared to pure calcium carbonate. A higher ECCE indicates a more effective liming material.

In this case, the recommended lime material has an ECCE of 80, while the material available has an ECCE of only 65. To adjust for this difference, the lime rate must be increased to compensate for the lower effectiveness of the material being used.

To calculate the adjustment factor, divide the ECCE of the recommended material by the ECCE of the available material:

Adjustment Factor = ECCE of Recommended Material / ECCE of Available Material

= 80 / 65

≈ 1.23

This calculation indicates that to achieve the same neutralizing effect as the recommended material, the rate of the liming material with an ECCE of 65 should be about 1.23 times higher than the recommended rate for the material with an ECCE of 80. When considering the options, 1.2 times the recommendation is the closest available adjustment