You have two fields, A and B, with the following characteristics. Field A Field

Question

You have two fields, A and B, with the following characteristics. Field A Field B OM( %) 0.8 3.1 Clay (%) 10 35 Sand (%) 74 51 Type of clay 1:1 2:1 pH 409 4.9 Field B needs 3 t/ha lime, but you have lost the lime recommendation for field A. What is your best guess regarding lime rate for Field A:

a) Same amount of lime as Field B since pH is the same

b) More lime than Field B because it contains mainly a 1:1 clay

c) Less lime than Field B because Field A will have lower buffer capacity

d) Cannot be determined with the available information

Explanation / Answer

Answer : c) Less lime than Field B because Field A will have lower buffer capacity.

Explanation : Liming of soil depends on the buffer capacity of the soil that is in turn related to the soil cation exchange capacity (CEC). Low CEC soils will witness more rapid leaching and overliming might also occur on such soils.

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