3. Soil Texture Determination through Feel Method.pdf
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3. Soil Texture Determination through Feel Method.pdf
- 1. MARJORIE JEAN E. TAO Agriculturist II Soil Physics Section Laboratory Services Division BUREAU OF SOILS AND WATER MANAGEMENT Soil Texture Determination (Feel Method)
- 2. - refers to the proportion of sand, silt and clay sized particles that make up the mineral fraction of the soil - influences almost every aspects of soil use both agriculture and engineering applications and even how natural ecosystem functions This PhotoThis Photo by Unknown Author is licensed under CC BY-SA SOIL TEXTURE
- 3. Soil Separate Particle Size Grades (Millimeters) Very coarse sand 2.0 – 1.0 Coarse sand 1.0 – 0.5 Medium sand 0.5 – 0.25 Fine sand 0.25 – 0.10 Very fine sand 0.10 – 0.05 Silt 0.05 – 0.002 Clay Less than 0.002 SOIL TEXTURE
- 4. Sand - Feels gritty Silt -feels like flour (dry) -feels smooth (wet) Clay - hard and brittle (dry) -feels sticky (wet) SOIL TEXTURE
- 5. Coarse-textured soils 52-100% sand Medium-textured soils Even distribution of clay and sand Fine-textured soils at least 35-40 % or more clay GUIDE TO SOIL TEXTURE BY FEEL METHOD
- 6. GUIDE TO SOIL TEXTURE BY FEEL METHOD
- 14. Coarse-textured soils -Low water holding capacity -High water infiltration rates -High potential for leaching -Low nutrient retention GUIDE TO SOIL TEXTURE BY FEEL METHOD
- 15. Fine-textured soils -Slower water infiltration rates -Remains wet longer -High nutrient retention GUIDE TO SOIL TEXTURE BY FEEL METHOD
- 16. Medium-textured soils -Sufficient water infiltration -Good water holding capacity and nutrient retention GUIDE TO SOIL TEXTURE BY FEEL METHOD
- 17. • By feel and sight observation o Sand – gritty o Silt - smooth or silky o Clay - smooth and exhibits stickiness and plasticity FACTORS AFFECTING FEEL METHOD
- 18. FACTORS AFFECTING FEEL METHOD • Composition of the soil o Clay Mineralogy - montmorillonitic and kaolinitic clay o Organic matter content - lowers plasticity o Mica content - lubricating effect of platy minerals of silt and sand o Salt content - crystallization of salt
- 19. Modified from S.J. Thien. 1979. A flow diagram for teaching texture by feel analysis. Journal of Agronomic Education. 8:54-55. https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/edu/?cid=nrcs142p2_054311 date retrieved: August 28, 2022 Moebius-Clune, B.N., D.J. Moebius-Clune, B.K. Gugino, O.J. Idowu, R.R. Schindelbeck, A.J. Ristow, H.M. van Es, J.E. Thies, H.A. Shayler, M.B. McBride, K.S.M Kurtz, D.W. Wolfe, and G.S. Abawi, 2016. Comprehensive Assessment of Soil Health – The Cornell Framework,Edition 3.2, Cornell University, Geneva, NY. USDA-NCS. 1987. Soil Mechanics Level I. Module 3 – USDA Textural Classification. REFERENCES
- 20. Thank you for your attention!