(B) The soil 100% Clay texture 80 20 triangle is 70 30 a diagram Clay content (% Clay 40 often used 50 Silt content(%) 50 Silty Sandy clay 40 60 to figure clay Clay loam Silty clay >Sandy clay loam 70 out soil loam 20 80 Loam Silt loam textures. 10 Sandy loam 0 /Sand、 nd 100% 100% 90 0 60 50 0 3020 10 o Silt Sand Sand content(%) 重3 College of animal science,Northwest Agriculture Forestry University 西北农林科技大学动物科技学院草业科学系
__________________________________________________________________ College of animal science, Northwest Agriculture & Forestry University 西北农林科技大学动物科技学院草业科学系 Copyright reseved by Long Mingxiu The soil texture triangle is a diagram often used to figure out soil textures
Effects of Soil Texture: Soils are more cohesive when they have more fine particles (Clays) Soils are more loose when the have more coarse particles (Sand) Different combinations of coarse and fine contents produce different soil textures. A loam is a mixture of sand,silt and clay:sandy clay loam is best in landscapes Many other inclusions,such as cobbles.boulders. College of animal science,Northwest Agriculture Forestry University 西北农林科技大学动物科技学院草业科学系
__________________________________________________________________ College of animal science, Northwest Agriculture & Forestry University 西北农林科技大学动物科技学院草业科学系 Copyright reseved by Long Mingxiu
Soil Consistency O Describes the general organization of the soil. O Hold a moist sample between the thumb and forefinger,and gently squeeze it until it falls apart. OThe soil is classified by the following categories Loose:You have trouble picking out a single sample and the structure falls apart before you handle it. Friable:The sample breaks with a small amount of pressure. Firm:The sample breaks when you apply a good amount of pressure and dents your fingers before it breaks. Extremely Firm:The sample can't be crushed with your fingers (you need a hammer!). Copyright reseved by Long Miitg College of animal science,Northwest Agriculture Forestry University 西北农林科技大学动物科技学院草业科学系
__________________________________________________________________ College of animal science, Northwest Agriculture & Forestry University 西北农林科技大学动物科技学院草业科学系 Copyright reseved by Long Mingxiu
Soil Consistence Loose* Friable Soils with"single grained"structure always have loose consistence. Firm Extremely Firm yright reseved by Long M College of animal science,Northwest Agriculture Forestry University 西北农林科技大学动物科技学院草业科学系
__________________________________________________________________ College of animal science, Northwest Agriculture & Forestry University 西北农林科技大学动物科技学院草业科学系 Copyright reseved by Long Mingxiu
Soil Structure:the shape that the soil takes based on its physical and chemical properties.Possible choices of soil structure are: ●With Structure: ●Without Structure O Granular O Single Grained Blocky O Massive O Platy O Prismatic O Columnar COr8r1 evedby Lon8M金8影 College of animal science,Northwest Agriculture Forestry University 西北农林科技大学动物科技学院草业科学系
__________________________________________________________________ College of animal science, Northwest Agriculture & Forestry University 西北农林科技大学动物科技学院草业科学系 Copyright reseved by Long Mingxiu