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The accumulation of nitrogen in different utilization age (0, 1, 2, 3, 4, 5, 10, 13-year) vegetable greenhouses soil with multi-point mixed samples was examined in Shenyang suburb, Liaoning province, China. The results showed that the content of N of all samples was increased with the utilization ages of the vegetable greenhouses. For all the samples, the concentration of total nitrogen (TN) and nitrate...
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