That is , most people live on the isolated farmsteads , and their lives revolved around the weather and hours of daylight , many people grow their own food and many wives make own clothes for their family 当时大部分人住在孤立的农场里，他们的生活主要是依靠利用天气和日光灯资源，自给自足。
The mission of the conservation and production research laboratory is to 1 ) develop improved water management methods and irrigation technology for sustaining or enhancing crop productivity , improving water use efficiency , reducing ground water use , and enhancing water and soil quality ; 2 ) develop management practices that optimize the use of water , soil , climatic , and nutrient resources for economically and environmentally sustainable crop and livestock production systems under dryland and limited - irrigation conditions ; 3 ) develop systems for utilizing renewable energy sources ( wind , solar , and biofuels ) for pumping irrigation , livestock , and farmstead water and generating electric power ; 4 ) develop regimens that reduce environmental risks posed by accumulations of feedlot wastes by reducing the phosphorus content , improving nutrient utilization , and applying manure to grasslands 描述:美国农业部保持与生产研究实验室的主要任务是： 1 .开发水资源管理方案或灌溉技术，提高用水效率，减少地下水使用，改善土壤和水质； 2 .使水资源、土壤资源、气候和养分资源达到最优化，以保证在干旱和灌溉条件有限的地区种植业和畜牧业能可持续发展； 3 .开发可再生能源用于灌溉、畜牧饲养和发电； 4 .通过减少磷成分，降低饲养场废弃物的环境风险，将其施用于牧草地，提高养分利用率。
