Some plants would control pests and soil quality naturally, and humans helped by rotating their crops; if extra fertilizer was needed, manure usually filled in.
一些作物本身就具备防治病虫害、保持土壤肥力的功效，人类辅以轮种；即便需要添加一些肥料，大多用的是人畜粪便。
An influent quality experiment of artificial soil rapid infiltrations ystem has been conducted by using both soil column and pilot-scale plant filled with artificial soil.
利用人工土柱和中试工程开展了人工土快滤处理系统的进水水质试验。
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