The factors affecting soil fertility are: river harnessing, fertilizer application, and the changes in cropping system and land utilization after the adoption of high yield hybrid verities.
影响肥力变化的因子包括河流治理、施肥、高产品种使用后种植制度和土地利用程度的变化等等。
The key factors involved in the changes in the Sihe river system are the invasion of the Yellow river and the opening of the Grand Canal.
泗河水系河道变迁的主要因素是黄河夺泗和南北大运河的开发。
The key factors involved in the changes in the Sihe river system are the invasion of the Yellow river and the opening of the Grand Canal.
泗河水系河道变迁的主要因素是黄河夺泗和南北大运河的开发。
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