leaching requirement meaning in English

冲洗需水量
淋溶需水量

Study an effect of using sulfur - removal waste residue ( the vice - product produced by sulfur - removal device of the factory using coal as energy resource to absorb oxidizing sulfur , whose mainly composition is gypsum ) as an amendment to the alkali soil in theory . with certain water as leaching requirement leaching soil column indoor employed with certain quantity sulfur - removal waste residue after collecting and analyzing representative soil sample . collecting and analyzing the filtrate , then calculate the data and speculate the result to guide the field production
本文重点是对煤烟脱硫废渣(利用煤炭作为能源的工厂的除硫装置消除硫氧化物后的副产物，主要成分为石膏)改良碱土进行理论研究，方法上以室内土柱淋溶模拟为主，采集有代表性的碱土并分析其成分后，采用小水量定额灌洗，收集分析滤液化学成分，进行推理分析计算并指导田间的生产实际。