Soil improvers and growing media - sample preparation for chemical and physical tests , determination of dry matter content , moisture content and laboratory compacted bulk density 生长剂和土壤改良剂.化学和物理试验的样品准备实验室压实体密度水分含量和干物质含量的测定
Vegetables and other crops - $ 1 , 120 per dau chung ( including cost of $ 120 and $ 350 for soil conditioner and extra labour respectively ) up to a maximum of $ 6 , 720 for 6 dau chung 蔬菜及其他农作物-每斗种1 , 120元(包括购买土壤改良剂的120元及雇用额外劳工的350元) ，最高可达6 , 720元( 6斗种) 。
Charcoal making is a process for separating wood and bamboo into its solid , almost pure carbon component and its volatile liquid component by means of a chemical reaction known as thermal decomposition 烧成的炭可成为一种用途广泛的资源，如地下调湿炭，土壤改良剂等等。这种烧炭方式把木材竹材通过热分解化学反应将固体成分的炭素和水分分离开来。
The compost could be used as a soil improver and thus obviate the necessity to apply high levels of organo - phosphate fertilisers to stimulate growth targets in agriculture and thus reduce the serious and increasing problems associated with pollution of groundwater sources with the run - offs containing these substances 这些肥料可以用作土壤改良剂，从而消除了农业领域使用高有机磷化肥来刺激植物生长的必要性，因此减少了日益严峻和不断增长的与地下水源污染相关的问题，并对这些物质进行分离。
The objectives of this study were : i ) to understand the mechanism of applying polyacrylamide ( pam ) to control crust formation , to increase infiltration and reduce soil erosion ; and ii ) to quantify the dynamics of soil erosion processes with rare earth elements ( ree ) tracers 本文的目的是研究利用聚丙烯酰胺( pam )作为土壤改良剂来抑制土壤表面结皮，增加降水入渗，减少土壤表面径流，降低土壤侵蚀；同时采用稀土元素( ree )示踪土壤侵蚀的动态过程，研究土壤侵蚀的动力学机理。
