تلخیص
Soil texture is an important aspect of a soil profile and particle-size distribution also has a significant role in most of the soil properties. Soil texture of three profiles (Caemarfon, Lleiniog, and Penmon-buried profile) was estimated by hydrometer method. The same procedure was repeated with samples treated with 1M HCl to remove their carbonate contents. After having the readings for 50- 20um, 20-6.3um, 6.3-2um, and <2um fractions by hydrometer, the materials were flushed through a series of nylon mesh sieves to get 2000-630um, 630-200um. and 200-63um fractions. Cumulative curves between the cumulative weight percentages and the particle size (um) were drawn on the log scale. It was concluded that the increase in clay contents down the two profiles (Caemarfon and Lleiniog) is the result of lessivage process. While the increase in clay with depth, at Penmon buried profile, was attributed to the variation in the original parent material because the pedogenic processes, due to its deep burial under a thick sand layer, were not operating here. However, the decrease in clay contents as
a result of acid treatment which dissolved calcite grains in this size provided a non-visual proof of the size of calcite particles
D.A.Jenkins'', A. Ali*. (1995) EVALUATION OF PARTICLE SIZE DISTRIBUTION AND USE OF HYDROCHLORIC ACID AS A PRETREATMENT IN CALCAREOUS SOILS FOR INVESTIGATING PEDOGENIC PROCESSES, The Journal Soil & Environment , Volume 10, Issue (1-4).
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