After analyzing the water pollution in agriculture, the authors point out that irrational sewage irrigation, fertilization and pesticide application were the main origins for non-point pollution.

分析了农业中水污染的情况，指出不合理污灌、施肥、施药是引发面源污染的重要污染源。

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Fig. 4 Effects of soil biological factor (non-sterilized vs. sterilized) and fertilization management (chemical vs. organic fertilizer) on planthopper mass.

图4土壤生物因素(对照和灭活)及施肥因素(化肥和有机肥)对褐飞虱生物量的影响。

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Fig. 4 Effects of soil biological factor (non-sterilized vs. sterilized) and fertilization management (chemical vs. organic fertilizer) on planthopper mass.

图4土壤生物因素(对照和灭活)及施肥因素(化肥和有机肥)对褐飞虱生物量的影响。

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