草品作布 Soil Structure:with Structure Granular Block Columna Prismati Platy College of animal science,Northwest Agriculture&Forestry University 2 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
Loose arrangement,don't Infiltration rate is slow stick together,e.g.sand Single grain Blocky Platelike Rapid Moderate Slow Lots of -Infiltration Rate Common in arid areas organic Granular Prismatic Massive matter, e.g. grassland soils Consequence Rapid Moderate Slow Infiltration Rate of overgrazing F■▣RAGES Figure 3.10 Note the variety of shapes occurring in soil aggregates and the relative rates at which water can move through them.(From Owen and Chiras 1995.) 4。 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 Loose arrangement, don’t stick together, e.g. sand Infiltration rate is slow Lots of organic matter, e.g. grassland soils Common in arid areas Consequence of overgrazing
Soil Structure:without Structure Single Grained Massive FORAGE Copyright 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
Chapter 2 soil and soil tillage The ideal soil structure--granular 团粒结构：农业的理想土壤结构。 ·Why2 。 (1)大小孔隙比例适当，既保水保 肥，又通气透水。 ·（2)接触面小，耕作阻力小，容易 耕种。 FORAGES COr8r1 eved by Lon8M金影 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 • The ideal soil structuregranular 团粒结构：农业的理想土壤结构。 • Why? • （1）大小孔隙比例适当，既保水保 肥，又通气透水。 • （2）接触面小，耕作阻力小，容易 耕种。 Chapter 2 soil and soil tillage
sand adsorbed air uranium por pace silt adsorbed water uranium FOR oonege or amar Scicnce,nortmvestAgncuture c r orestry onversity 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