Sectionl Concept of soil tillage and basic manipulation Concept of soil tillage Tillage- The mechanical manipulation of the soil profile for any purpose. Soil tillage-oldest procedure of agriculture to manipulate the soil to improve crop production. Farmers of West Africa preparing their land for planting

Chapter 9 Soil acid-base and redox reaction Section 1 The formation of soil acid-base The acid-base reaction of soil The acid-base reaction of soil is change in soil pH. Soil pH is probably the single most important chemical charecteristic of a soil. The knowledge of ph is needed to understand important chemical processes such as ion

Section 1 Soil colloidal surface nature Surface types of the soil colloid (一) Siloxane surface (二) Hydrous oxide surface (三)Organic matter surface

Section 1 Soil air 一、 Composition of soil air Compare soil air with atmosphere( Volume % Atmosphere

Section 1 The types of soil water and measuring soil moisture a

Section 1 Soil three phases Constitution Soil density and bulk density (- Soil density (or Particle density Soil density is the density of the solid soil particles only; the measurement does not include water weight or pore(air)space. The dominant soil minerals- quartz, feldspars, micas, and clay minerals

一.为什么要了解土壤有机质? 二土壤有机质是什么?有多少? 三.土壤中有机质如何转化? 四.土壤腐殖质如何存在? 五.土壤腐殖质有什么作用?如何更好地发挥这种作用?

Section 1 The chemical and mineral constitutes of soil parent minerals The chemical constitutes of soil parent minerals

HOME BACK FORWARD! PRINT SEARCH EXI INTRODUCTION Major soils of the world ORGANIC SOILS Mineral soils World Reference base for soil resources: atlas

Introduction to soil science By Genxing pan Department of Soil Science, Inst Resources, Ecosystem Environment of Agriculture(Ireea) www.ireea.kyig.njau.edu.cn