Soil sampling for the purpose of fertility assessment is normally confined to the plough layer with little or no attention to the rooting pattern of the crop in question or the availability of subsoil nutrients. However, there is little doubt that a thorough understanding of the development and activity of plant roots in their soil environment is essential to a balanced soil fertility research ...

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.

was undoubtedly true scientifically was not correct from the point of view of financial economy and from the point of view of Nature herself. I propose, therefore, to review very briefly the three main methods which were discussed, all of which have been prominently before us of late. They are? 1.?Subsoil drainage. 2.?Oil-spraying. 3.?The retention of close vegetation on waterladen areas, or re...

Ground-penetrating radar (GPR) is a geophysical and close-range remote sensing technique based on the use of radar pulses to obtain cross-section images of underground features. This method is characterized by the transmission of an electromagnetic short length pulse (1-2 ns), presenting a centre frequency ranging from 10 MHz to 2.5 GHz. The principles of GPR operation are based on the ability ...

Results are reported of a 3x3x3 factorial trial in which phosphogypsum (PG), dolomitic limestone (DL) and single superphosphate (SS)were applied to sugarcane. The trial was situated on a Kranskop form soil with a moderately toxic aluminium (AI) content. Based on the combined yield responses from the plant and first ratoon crops, treatments with SS were superior to those with PG, and little resp...

The loading, solubility, mobility, and plant availability of P is a growing environmental concern to regulators and planners of nutrient management plans, confined animal feeding operations, and wastewater land application permit sites. Insufficient information is available on how P reacts from different organic sources when applied to calcareous soils. A field study was conducted to determine ...

During oil-sands mining all vegetation, soil, overburden, and oil sand is removed, leaving pits several kilometers wide and up to 100 m deep. These pits are reclaimed through a variety of treatments using subsoil or a mixed peat-mineral soil cap. Using nonmetric multidimensional scaling and cluster analysis of measurements of ecosystem function, reclamation treatments of several age classes wer...

A comprehensive investigation of the subsidence induced in the area of Bologna (Italy) by groundwater extraction is presented. Initially, the geological pattern of the region is reviewed in order to identify the large scale subsoil features governing the water flow regime and the ground displacements. Several types of data, covering the different aspects of the problem are then combined into a ...

Abstract The upwelling of fluids, subject to overpressure, along with discontinuities in the subsoil, causes formation geological structures known as mud volcanoes. These structures, very widespread world and some cases located near inhabited centers, can represent a considerable risk factor for population, they give rise paroxysmal eruptions, even violent. assessment characteristics structure ...