3. Soil Texture Determination through Feel Method.pdf
1. MARJORIE JEAN E. TAO
Soil Physics Section
Laboratory Services Division
BUREAU OF SOILS AND WATER MANAGEMENT
Soil Texture Determination
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
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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
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.