These two factors result in difficult control of water and powder in urea, lowering down urea quality.
这两个因素引起成品尿素中的水分及粉尘难以控制，降低了成品尿素质量。
P was one of the important factors in evaluating water quality. The management of P in agriculture was the main approach to control the eutrophication of the water.
磷是影响水质的一个重要因子，农业环境中磷素的管理是控制水体富营养化的重要途径。
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