一.叶部病害 1 玉米大斑病

一,花生病害 1 黑斑病

一、苹果病害 1 炭疽病

一、根部病害 1 烟草黑胫病

一、水稻叶部病害 1 稻瘟病

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