0 the layer of soil that is under the surface level --
1 the layer of earth under the topsoil (= the layer of earth in which plants grow) --
Although the quality of the available information is uneven, an accurate analysis and filtering of the borehole logs provides a useful database of subsoil geology.
If shorter-duration varieties of rabi crops are used, they can reach maturity before the residual subsoil moisture is exhausted.
One might expect the topsoil to be drier and the subsoil to be wetter in gaps compared to the understorey.
Further information is available from the subsoil, however, mainly from boreholes drilled for water pumping during the second half of the twentieth century.
The data showed that the adverse effects of subsoil compaction on all the soil physical parameters persisted for at least four years.
Overall, the adverse effects of subsoil compaction treatment on the yield and yield components of wheat have persisted for at least four years.
A first step taken by many nations and researchers has been to value the stock and depletion of subsoil mineral reserves.
The authors also propose management and prevention thresholds for tire inflation pressure where the carrying capacity of subsoil is used to determine acceptable wheel loads.
