Problem on the bearing capacity of cast-in-place pile influenced by the deposit at pile end and the mud hanged on pile shaft can be solved by the technique with the post grouting.

Another part of limpid phosphoric acid after removing subsiding sludge was concentrated and neutralized to produce granular DAP.

When sand sinking pools are full and lose efficacy, the method of "digging out sands to wait for deposition" can increase the life of irrigation region.