影响土壤比重的因素: 土壤比重仅仅取决于土壤固相颗粒的物质组成。 Since a large portion of most soils is composed of particles derived from quartz minerals, the particle density of most soils is near 2.6 g/cc which is the density of quartz. Variations in the particle density are due to the presence of heavier minerals like iron oxides or lighter organic components

1.土壤耕作的概念及其基本操作(重点) 2.土壤力学性质(重点) 3.土壤耕性和耕作管理(重点) 4.几种主要耕作方法

第一节土壤有机质来源及其组成特点 一、有机质来源 (一)来源于数目众多微生物 1微生物是最早出现在母质中的有机体。成为最早的土壤有机物质来源。 2微生物数目繁多,生活代谢周期短。1g肥沃的表土含有细菌可在10亿以上。最多细菌为杆菌,每英亩细菌活质可超过2000磅,每公顷2000公斤

Sectionl Concept of soil tillage and basic manipulation Concept of soil tillage Tillage- The mechanical manipulation of the soil profile for any purpose

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

《土壤学》课程教学资源（试卷习题）期末考试试题（A卷）答案

《土壤学》课程教学资源（试卷习题）期末考试试题（A卷）题目

HOME BACK FORWARD PRINT SEARCHHELPEXIT INTRODUCTION Maior soils of the world ORGANIC SOILS Mineral soils World reference base for soil resources: Atlas

《土壤学》课程教学资源（参考资料）监测小麦叶片氮积累量的新高光谱特征波段及比值植被指数

《土壤学》课程教学大纲 Soil Science