Forages:An Introduction to Grassland Agriculture Chapter 2 Soil and Soil Tillage Instructor: Long Mingxiu F■RAG 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 Forages: An Introduction to Grassland Agriculture Chapter 2 Soil and Soil Tillage Instructor: Long Mingxiu
Overview of Chapter 2 On completion this chapter you should learn: 1.Concepts: soil,soil fertility,soil texture,soil structure, soil tillage,mixed cropping,interplanting, multiple cropping 2.Soil type and the characters of soil texture and tillage measure. 3.What kind of soil structure is the most ideal ■RA日 in agriculture?why? Copyright reseved by Long Mig 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 On completion this chapter you should learn: 1. Concepts: soil, soil fertility, soil texture, soil structure, soil tillage, mixed cropping, interplanting, multiple cropping 2. Soil type and the characters of soil texture and tillage measure. 3.What kind of soil structure is the most ideal in agriculture? why? Overview of Chapter 2
We Study Soil Because It's A(n) Great integrator: Medium of crop all parts of ecosystem Snapshot of production geologic,climatic biological,and human history Producer and absorber of Waste decomposer gases Medium for plant growth Source material for construction, medicine,art,etc. Home to organisms (plants,animals and others) Filter of water and wastes Essential natural resource Colleye ol allllal sclelce,NoruIwest Aylcullule rolesuy Ulllveislly 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 Forming Factors Biota Parent Material Topography Climate (The first four factors over)Time These five factors work together to create a unique soil profile made of layers called horizons. College or animal science,Nortnwest Agricuiture 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
What is“Soil? Each discipline defines soil in a different way, depending on how soil affects it. In an engineering sense,soil is the relatively loose agglomerate of mineral and organic materials and sediments found above the bedrock." R.D.Holtz and W.D.Kovacs (1981) 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