Its watershed runs hundreds of kilometers through the heart of the most productive maize and livestock farming region in the united states , where producers annually apply thousands of tons of nitrate - rich chemical fertilizers and animal manure to their fields 它的水域长达数百公里，流经美国最富饶的玉米种植区和牧场区的心脏地带，在这一地区，农场主人们每年将数千吨含大量硝酸盐的化学肥料和动物粪肥施于田中。
As a whole always before his eyes . the object most prominent to his mind in the estate was not the azote nor the oxygen in the soil or the atmosphere , not a particular plough nor manure , but the principal agent by means of which the azote and the oxygen and the plough and the manure were all made effectualthat is , the labourer , the peasant 他的目光总是盯着整个庄园，而不是庄园的某一部门，在庄园里，主要的东西不是存在于土壤和空气中的氮和氧，不是特别的犁和粪肥，而是使氮氧粪肥和犁发生作用的主要手段，也就是农业劳动者。
The delegation received training in combined forms of classroom lectures and field tours in five locations in western canada . they studied basic facts about canadas agriculture , especially the agriculture and livestock in three western provinces , canadas agricultural policies and legislation , its agricultural policy framework and protective organizations ; pfras duties and internal structure ; prairie protection and pasture management , land utilization plans , dry land agriculture and protective cultivation ; public land administration ; agriculture credit policy and rules ; use and management of organic fertilizer ; agriculture technical extension ; gender issues ; farm produce marketing , and ; coal mine land reclamation 通过听取讲座，重点学习了加拿大农业特别是西部草原三省农牧业的基本概况农业政策和立法农业政策框架保护性组织机构草原农场恢复管理局的职责与内部结构草原保护与牧场管理土地利用规划旱地农业与保护性耕作公共土地管理农业信贷政策和农业借贷规则有机粪肥的利用与管理农业技术推广社会性别问题农产品营销以及煤矿复垦等方面的内容。
