ibps-so 2016 · Question 265 of 394

The eld o cer has to ll in the reaction class against each block before the reclamation estimate can be worked out, because the treatment and its cost turn entirely on that class. Block III carries a heavy load of exchangeable sodium on its clay complex, its surface puddles after rain and sets into a hard crust, and the o cer proposes to record it as an alkali soil and to provide for gypsum followed by leaching in the estimate. Before he does so he must satisfy himself of the gure of soil reaction above which a soil is placed in the alkali class at all, since a block wrongly placed in that class would carry a gypsum provision it does not need, and a block wrongly kept out of it would be leached without gypsum and would not improve. The pH of an alkali soil is

1. AMore than 7.0
2. BMore than 8.5Correct
3. CMore than 6.0
4. DMore than 9.5
5. EMore than 10.0