You have two fields, A and B, with the following characteristics OM( %) Clay (96

Question

You have two fields, A and B, with the following characteristics OM( %) Clay (96) Sand (96) Type of clay pH Field A 0.8 10 74 Field B 3.1 35 51 409 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 above 87) Which soil in question 34 will have the greater cation exchange capacity a) Field A b) Field B c) Both the same because the pH is the same d) Cannot be said from available information

Explanation / Answer

1.c. Less lime than field B because field A will have lower buffer capacity. Lime is used to increase pH of fields and field A has higher pH which says less lime required.

2.b. Field B. As field B has high clay and organic matter than field A, it has high cation exchange capacity.

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