求翻译：随着农业的不断发展，面源污染的问题在宁夏引黄灌区中日益突出，已经成为影响黄河水环境的重要因素之一，退水污染已经成为主要因素之一。退水污染主要来源于土壤硝态氮的淋失。因此，研究如何控制硝态氮淋失的技术成为保证黄河水质安全的主要途径。是什么意思？

With the continuous development of agriculture, non-point source pollution problem is becoming increasingly prominent in the Ningxia Yellow River Irrigation has become one of the important factors affecting the water environment of the Yellow River, the retreat of water pollution has become one of t

As agriculture continues to develop, the sources of pollution in Ningxia in terrain from Huang has become an increasingly prominent, has become the river environment one of the most important factors, water pollution has become one of the major factors. Water pollution comes mainly from soil nitrate

Along with agricultural unceasing development, surface source pollution question in Ningxia Huang river irrigated area day by day prominent, already became affects one of Yellow River pendular water ring boundary important attributes, drew back the water pollution already to become one of primary fa

With the continuous development of agriculture, non-point source pollution issues is increasingly prominent in the Ningxia Yellow River Irrigation District, has become one of the important factors affecting the environment the Yellow River, back water pollution has become one of the main factors. Ba

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