Sink: source ratio could be affected by plant density or fertilizer supply level.
库源比既受肥料水平的影响，也受密度的影响。
Animal manures were the main source of organic fertilizer, but their application for farming lands were limited due to a lot of pathogens, parasite ova and toxicant contained.
尽管畜禽粪便是有机肥料的主要来源，但是其携带的大量病原菌、寄生虫卵和有毒物质是影响畜禽粪便农田利用的主要原因。
The influences of fertilizer, pesticides, utilization and management of agricultural biomass waste, and soil erosion on the water source were analyzed.
分析了流域农业生产管理中的化肥和农药施用，农业生物质类废弃物利用管理和水土流失对水源污染的影响。
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