Proteg and enhang soil quality is aplished through the u of soil rvation efforts; Best Ma Practices for fertilizers aicides; and the proper u, handling and ste of agricultural chemicals, fertilizers, manures and soil ames.
With the human population still growing, urbanization increasing and climate ditions ging, the prote of this esntial resource is not only more urgent than ever, but is also fag pletely new challenges iure.
In respon to the challehe mission of the Soil Prote group is to establish stifiowledge required to sustain and mahe quality of soil as aial basis for human and other life. This includes:
early dete and identification of developments threatening ecological soil funs
asssment of physical, chemical and biological stress on soil and their impacts on soil quality and funing
characterization of risks for man and enviro deriving from soil pollution and degradation
development and evaluation of ter-measures against such threats and adver impacts and of ways for a sustainable u of soil funs
土地（Land）指地球表層（epigeosphere）的陸地部分及其以上、以下一定幅度空間範圍內的全部環境要素（enviroal elements），以及人類社會生產生活活動作用於空間的某些結果所組成的自然——經濟綜合體。
狹義的土地，僅指陸地部分，這種觀點較有代表性的是土地規劃（land-u program）專家和自然地理學家的觀點。廣義的土地，不僅包括陸地部分，而且還包括光、熱、空氣、海洋……。
減少土地侵蝕（erosion）的方法一般來說有以下幾種：
（1）消除或控製工業“三廢”（three industrial wast）的排放。
（2）加強土地汙灌區（wage irrigatiion）的檢測和管理。
（3）合理施用化肥（chemical fertilizer）和農藥（pesticide）。
（4）增加土壤容量和提高土壤淨化（soil sanitation）能力。