Diatomite at Lompoc, California. Johns-Manville Corporation (1964) mines some of the large diatomite deposits laid down in Santa Barbara County in the middle to upper Miocene (5-25 million y.a). Many of the current coastal regions, including those now occupied by Los Angeles and San Francisco, were then under the sea. The Lompoc area was probably an archipelago or series of shallow bays and bet...

A total of 12 species of marine gastropods, among which two taxa are new, is reported for the first time from the Miocene deposits of Khavich section, south of Sirjan, Kerman. Gastropods assemblage in Khavich area indicates deposition in shallow, warm ramp-type carbonate platform. The Miocene and even Oligocene gastropod assemblages, relatively similar to Khavich section, reported from the othe...

High water loss during land preparation of soils for rice (Oryza sativa L.) production results from bypass ̄ow through cracks. It was hypothesized that the losses can be reduced by measures that minimize crack development during the soil drying period or impede the ̄ow of water through these cracks. The effect of straw mulching and shallow surface tillage on crack formation during the fallow pe...

In shallow foundations, the third bearing capacity factor, N, has been found to show a decreasing tendency with increasing the foundation size. It is supported by experimental observations and related mainly to stress level dependent nature of the soil. On the other hand, the bearing capacity is often obtained theoretically without consideration of the foundation vertical displacements. In thi...

The Coimbatore varieties Co. 213. 214. '281 are compared with Uba in a soil of poor agricultural qualities. The surface soil is a shallow loam with a very stiff clay subsoil. The field is on a low lying flat and drainage is difficult; the crop is also liable to suffer severely in drought. Further details and a partial chemical analysis of the soil are given in the report on the plant cane results.

Groundwater is the main water resource for plant growth and development in the saline soil of the Yellow River Delta in China. To investigate the variabilities and distributions of soil water and salt contents at various groundwater level (GL), soil columns with planting Tamarix chinensis Lour were established at six different GL. The results demonstrated the following: With increasing GL, the ...

Aims: Many experiments have shown a positive effect of species richness on productivity in grassland plant communities. However, it is poorly understood how environmental conditions affect this relationship. We aimed to test whether deep soil and limiting nutrient conditions increase the complementarity effect (CE) of species richness due to enhanced potential for resource partitioning. Methods...

Different techniques for estimating seasonal water use from soil profile water depletion frequently do not account for flux below the root zone. Shallow water table contribution to supply crop water use may be important in arid and semi-arid regions. Development of predictive root uptake models, under influence of shallow water table makes it possible for planners to incorporate interaction bet...

The Electrical Conductivity Object Locator (ECOL) has been developed with the goal of detecting buried objects. Its specific capability to detect and characterize small-size plastic and metal objects buried at shallow depths is demonstrated. The technique can also detect larger objects at greater depths. The ECOL technique maps the soil subsurface conductivity and identifies variations in the c...