To determine the intrinsic resistivity for the different terms of the phosphatic series, we carried out, during the geophysical prospection in a parcel of 50 ha,5151 resistivity measurements as horizontal profiling (SYSCAL-R2 resistivity instrument IRIS Instruments) using the wellknown Schlumberger array, in order to map the spatial distribution of the sterile hardpan
We attribute the hardpan
that developed in some of the pots with [D.sub.W] = S to proliferation of foliage that increased rates of water-uptake to levels sufficient to capture much or all of the ground water being moved upward by capillary action.
In general, the cut areas before and after leveling had higher bulk densities than that of fill areas due to most probably exposure of the subsoil that had higher bulk density than that of the original surface soil, soil compaction by machinery, and arriving to a hardpan
. Similar results are valid for the bulk densities of subsurface soil (spatial distribution map of bulk density for subsurface soil was not given in order to save space in the paper).
Shay Church's full-scale elephants and whales derive much of their emotional and political force from the changes the clay undergoes in drying: its deep gloss grows mottled, then dusty; it cracks and scales like hardpan
desert against its supporting armature.
Testing of the main main magnetic anomaly was prevented by a siliceous hardpan
. Anomalous results (4m at 1230 ppm Zn, 209 ppm Cu and 0.3 g/t Au) were returned from 40m depth from a weathered siltstone adjacent to the main magnetic anomaly which remains untested and is a target for follow up RC drilling.
Moreover, frequent plowing led to the formation of hardpan
at the plow depths, decreases water infiltration with accelerated soil erosion (Alakukku et al., 2003).
It showed 54% increase in plant height over conventional tillage might be due to deep tillage that resulted in break down of hardpan
which facilitates root proliferation; more nutrients were available to plants.
A boy, me, waits for his birthday guests, bouncing a half-inflated ball on the hardpan
. His eyes show the dawning conviction that no one is coming.
When small lakes dry up, they leave a salt crust or hardpan
. The flat area of clay, silt, or sand encrusted with salt that forms is known as a playa or a sink.
Rototillers fluff up the soil down to about seven inches and then leave you with hardpan
In addition, the gravel content and hardpan
appeared to be barriers to deeper root development, so the roots may not have reached the soil water.
But when faced with a 300-yard shot at a Kudu across a flat hardpan
, my PH literally forced his sticks on me.