Vegetables occupy a very important position on peple's diets. Green and organic vegetables have been growing concern and attention. Nitrate content of greenhouse vegetables is much higher than that in the field. Reducing the Nitrate content of vegetables has a significant impact on improving the quality of vegetable and ensuring the health of human.The Nitrate accumulation of vegetables is directly related to Nitrogen fertilization.In this paper, conventional methods combined with the isotope tracer techniq...
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