植物化学保护ppt课件

发布时间:2013-08-09

课件大小:1.92 MB

所属栏目:农业类

课件格式:.rar(压缩解压).ppt(使用格式)

课件等级:植物化学保护ppt课件推荐等级为3星

简略标题:植物化学保护

应用环境:应用于多媒体教学

制作使用软件:PowerPoint

应用阶段:农学

植物化学保护ppt课件介绍及下载


植物化学保护ppt课件内容预览:Plant provide either directly or indirectly the main source of nutrition for mankind,animals and uncountable masses of lower organisms. An ample supply of food,fibers and other vegetable matter is a prerequisite to health as well as to social and economic development of any human society. Thus,the increase competition from all kinds of organisms,which cause injury,disease ,is unwanted. Man is waging a continuous struggle against these injurious and troublesome organisms,called pest,pathogen and weed etal.in order to protect his food,shelter and living.Owing to the spectacular development of agriculture in general during the 20th century,word food production has grown considerable to the extent that per capital food production has increased in spit of the explosive growth of the world population. However,growth figures differ greatly for continents and individual countries. Developing country provide only about 3016036170f the world requirement of food although they are home to more than half of the global population,and agriculture accounts for more than 7020100240f their national income;in 1985,the ratios for malnourished and healthy people were 1:3in Africa,1:5in east Asia and 1:7in LatinAmerican.In this book,the role of pesticide in agricultural productivity has been strongly emphasized to sustain the crop yield and quality over the world. However,the crop protection is very complicated because of the numerous interactions between the cultivated crops,the many damaging or beneficial organisms and the variable factors of the environment. The use of chemicals,having an enormously disruptive power on the fragile balance of nature,requires general insight into their properties and effects.Chapter 1 Basic Concept of Plant ChemicalProtection1 Definition and Class ofPesticide2 Toxic Power ofPesticide3 Effects of Pesticide onCrop4 Toxicity ofPesticide5 Principles for Safety Application ofPesticideDdefinition of pesticidesClassification ofPesticideClassified According to source of Material andComponentClassified According toUseClassified According to FunctionalMannerpptInsecticidesFungicidesHerbicidesSection 1 Definition and Classification ofPesticideAny substances or mixture of substances and their preparations which were synthesized chemically or derived from organisms or other natural matters (1)intended for preventing,destroying,repelling,or mitigating any pest (2)intended for use as a plant regulator,defoliant or desiccant.U.S.A.:AgriculturalChemicals
课件关键字:植物化学保护,植物,化学,保护。
进入下载页面

上一课件:佛教名山ppt课件 下一课件:瓜果、蔬菜栽培ppt课件

下载说明

1、本站所有ppt课件只支持用快车(flashget)下载,不支持其它方式下载。下载后建议使用WinRAR解压本站课件。
2、本站资源为.ppt的格式,请先确认电脑内安装内了office办公软件,这样才不至于影响您的正常使用。
3、本站仅提供的植物化学保护ppt课件,仅作为交流学习之用,版权归作者所有。
4、有些课件由于太大或网速原因,无法立即观看或下载,需要加载,请稍等一会!
5、点击右边“分享到...”与好友共分享,TA会感谢您的,谢谢您的支持,我们会努力做得更好!
6、如果您发现无法下载或者有什么建议或者意见,观迎来信告诉我们,谢谢!