Journal of Ecology and Rural Environment ›› 2018, Vol. 34 ›› Issue (6): 571-576.doi: 10.11934/j.issn.1673-4831.2018.06.013

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A Comparison Study on Quality of Organic and Conventional Rice and Wheat

JIN Shu1,2, XI Yun-guan1,2, WANG Lei1,2, CHEN Qiu-hui1,2, TIAN Wei1,2, YANG Yu-wen1,2   

  1. 1. Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China;
    2. Organic Food Development Center, Ministry of Environmental Protection, Nanjing 210042, China
  • Received:2017-09-28 Online:2018-06-25 Published:2018-06-14


Information about the effect of organic and conventional practice on the quality of rice and wheat was little known. A field experiment was conducted to investigate the effects of organic and conventional rice and wheat rotation on nutritional quality including 4 kinds of protein, 8 kinds of essential amino acid, 10 kinds of non-essential amino acid, mineral elements, vitamins and total flavonoids, and the effects on safety quality including nitrate and 7 kinds of heavy metals. The results show that organic rice and wheat are significantly lower in protein contents (P<0.05) than conventional ones. Both the contents of essential amino acids and non-essential amino acids of organic rice and wheat were significantly lower than conventional rice and wheat practice except for cystine, aspartic acid, tryptophan and methionine, and threonine in organic wheat (P<0.05). Organic crops had much lower heavy metal contents compared with conventional cultivation, especially for Cr and As contents in the rice grains which were 42.41% and 52.78% lower than those in the conventional ones, and the contents of Cd and Cu in organic wheat were 50.00% and 18.42% lower than those in conventional ones. Both rice and wheat from organic system contained higher flavonoids than that from conventional system, while nitrate content in organic rice is significantly lower than conventional rice (P<0.05). All the findings indicate that organic practice could produce more safety rice and wheat compared with conventional practice, but there are differences in nutritional quality between organic and conventional rice and wheat.

Key words: rice, wheat, organic farming, quality, comparison

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