Test strips, in particular, have provided a favoured method of obtaining soil nutrient status information since the 1970s. Today there is renewed interest in using semi﹒ualitative colorimetric methods in soil assessment due to incorporation of modern technological solutions, such as smartphones, ...
The test procedures comprise the measurement of soil permeability, CBR value, drained and undrained shear strength, and consolidation characteristics. Additional material in this new edition includes the Fall cone procedure for measurement of shear strength in clays based on the European Technical Specific...
orchard study site, while for the vineyard site, the cover crop practice was used. For the fruit orchard field, the crop-type change procedure (orange to avocado) was used. The experiment demonstrated that soil-improving cropping techniques have an important impact on soil erosion, and as a ...
Existence of a standard method of estimation (standard operating procedure) x x Availability of reference material for quality control x Cost (sampling, hardware, analysis, labour) x x x x x x x x Sensitivity Spatial variation x Temporal variation (not influenced by short-term weather patte...
of organic materials are present, as is the case with many biological materials such as leaves or animal tissue, the use ofperchloric acidmay be required forcomplete oxidationfollowing prior digestion with nitric acid. Obviously care must be taken with this procedure to avoid the risk of ...
摘要: The Arkansas soil-testing program currently uses the Mehlich soil extraction procedure with a modified soil-to-extraction-solution dilution ratio of 1: 7 instead of the standard 1: 10 dilution. This study was performed in order to facilitate the decision process...
(six replicates) were watered with sterilized water and transferred to the growth chamber with an average temperature of 25 °C, 80% relative humidity, and 16 h light/8 h dark. The plant fresh weight was determined after planting for 15 days. The procedure for producing fungal spores...
A significant correlation between contact toxicity test results and partitioning of cadmium in the soil samples (r2= 0.79, p <0.05; n = 26) was found. The results confirm that the bioavailability of cadmium in soil depends on its sorption behaviour. Cadmium sorbed to the cation exchange sites...
Such procedure may facilitate the establishment of clusters of action (areas of priority) where implementing appropriate monitoring tools and preservation measures. This might pave the way to a new strategy overcoming the eternal difficulty, faced by the scientific community, to propose reliable ...
Then, a fuzzy c-means classification procedure was used and, as a result of the clustering analysis, two homogeneous zones were delineated with low or high CC, which coincided with areas of low and high ECa, respectively. They suggested further studies to compare the proposed subfield regions,...