关键词: 污泥堆肥, 珍珠岩, 理化性状, 孔雀草

Abstract: Suburban soil eutrophication has become an environmental issue not evasive for the sustainable development of suburban agro-ecosystem. The enrichment of nitrogen and phosphorous is the main manifestation of suburban soil eutrophication, and the excessive accumulation of nitrate in edible parts of vegetables induced by soil nitrate accumulation is a technical puzzle to be solved urgently.  This paper summarized the research progress on the genotype difference in the nitrate accumulation of different vegetable species and varieties and the physiological and biochemical mechanisms of the formation of the difference. It was considered that to fully use our rich vegetable germ plasma resources to screen the vegetable varieties with weak uptake and low accumulation of nitrate based on the genotype difference in absorbing and accumulating nitrate would be the key for decreasing and controlling the nitrate content in vegetable edible parts and for reducing the relying on nitrate agronomy of intensive production in suburban fragile eco-environment.

Key words: sewage sludge compost, perlite, physical and chemical property, Tagetes patula.