Soil Texture by Feel

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Soil Texture by Feel Place soil in palm of hand. Add water drop-wise Does the soil remain in a ball when squeezed? and knead the soil into a smooth and plastic consistency, like moist Yes No putty. Add water Add dry soil Yes Is the soil too dry? No Yes Is the soil too wet? No Place ball of soil between thumb and forefinger, Sand gently pushing the soil between with the thumb, Type 1 squeezing it upward into a ribbon. Form a ribbon of uniform thickness and width. Allow ribbon to emerge and extend over the forefinger, Loamy Sand breaking from Type 1 its own weight. No Does the soil form a ribbon? Yes What kind of ribbon does it form? Moisten pinch of soil in palm and rub with forefinger. Forms a weak Forms a 1 - 2” Forms a ribbon less ribbon before ribbon 2” or than 1” before breaking longer before breaking breaking Loam Clay Loam Clay Type 2 or 2A Type 3 or 3A Type 4 or 4A Does it fell Yes Sandy Loam Sandy Clay Sandy Clay very gritty? Loam Does it feel equally gritty Yes Loam Clay Loam Clay and smooth? Does it feel Yes Silt Loam Silty Clay Silty Clay very smooth? Loam If platy structure then soil type 5 Long-term Acceptance Rates Corresponding Long Term Acceptance Rate (LTAR) Soil Type, Texture, Structure and Percolation Rate Range in gallons per day per sq. ft. USDA Soil USDA Soil Soil Percolation Treatment Treatment Treatment Treatment Treatment USDA Soil Texture Structure- Structure- Type Rate (MPI) Level 1 Level 2 Level 2N Level 3 Level 3N Shape Grade Soil Type 1 with more 1.0 than 35% rock >2 mm (minimum 3’ 1.0 0 -- Single Grain <5 deep unlined Soil Types 2-5 with more sand filter (minimum 2-foot deep unlined sand filter required 2) than 50% rock (>2 mm) required 2) Sand -- Single Grain 5-15 0.80 1.25 1.25 1.40 1.40 1 Loamy Sand Sandy Loam Prismatic Moderate Loam Blocky 16-25 0.60 0.90 0.90 1.00 1.00 2 Strong Silt Loam Granular Prismatic Sandy Loam Blocky Weak Loam 26-40 0.50 0.70 0.70 0.80 0.80 2A Granular Massive Silt Loam None Sandy Clay Loam Prismatic Moderate Clay Loam Blocky 41-60 0.35 0.50 0.50 0.60 0.60 3 Strong Silty Clay Loam Granular Prismatic Sandy Clay Loam Blocky Weak Clay Loam 61-75 0.30 0.40 0.40 0.50 0.50 3A Granular Massive Silty Clay Loam None Sandy Clay Prismatic Moderate Clay Blocky 76-90 0.20 0.30 0.30 0.30 0.30 4 Strong Silty Clay Granular Prismatic Sandy Clay Blocky Weak Clay 91-120 0.15 0.20 0.20 0.20 0.20 4A Granular Massive Silty Clay None Weak 5 Soil Types 2-4A Platy Moderate 121+ 0.10 0.15 0.15 0.15 0.15 Strong Based on CDPHE WQCC Regulation 43 Table 10.1 Soil Treatment Area Long-term Acceptance Rates by Soil Texture, Soil Structure, Percolation Rate and Treatment Level 100 10 90 20 Textural 80 30 Triangle 70 Percent Silt Clay 40 60 Percent Clay 50 50 Silty Sandy Clay 60 40 Clay Clay Silty Clay 70 30 Sandy Clay Loam Loam Loam 80 20 Loam Sandy Loam Silt Loam 90 10 Loamy Silt Sand Sand 100 100 90 80 70 60 50 40 30 20 10 Percent Sand.

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The Soil Survey
The Soil Survey The soil survey delineates the basal soil pattern of an area and characterises each kind of soil so that the response to changes can be assessed and used as a basis for prediction. Although in an economic climate it is necessarily made for some practical purpose, it is not subordinated to the parti cular need of the moment, but is conducted in a scientific way that provides basal information of general application and eliminates the necessity for a resurvey whenever a new problem arises. It supplies information that can be combined, analysed, or amplified for many practical purposes, but the purpose should not be allowed to modify the method of survey in any fundamental way. According to the degree of detail required, soil surveys in New Zealand are classed as general, . district, or detailed. General surveys produce sufficient detail for a final map on the scale of 4 miles to an inch (1 :253440); they show the main sets of soils and their general relation to land forms; they are an aid to investigations and planning on the regional or national scale. District surveys, for maps, on the scale of 2 miles to an inch (1: 126720), show soil types or, where the pattern is detailed, combinations of types; they are designed to show the soil pattern in sufficient detail to allow the study of local soil problems and to provide a basis for assembling and distributing information in many fields such as agriculture, forestry, and engineering. Detailed surveys, mostiy for maps on the scale of 40 chains to an inch (1 :31680), delineate soil types and land-use phases, and show the soil pattern in relation to farm boundaries and subdivisional fences.
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