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- W2361383293 abstract "In this paper,we measured the salt content,ion composition and pH value of protected vegetable fields with different planting years in Songjiang district of Shanghai city.The results showed that,there was an obvious nutrient enrichment effect in protected vegetable fields,and the contents of available phosphorus and potassium increased with the planting years prolonged,while the contents of organic matter,total nitrogen and available nitrogen were highest when the planting year was four to five.The soil salt content and conductivity of greenhouses planted over four years were significantly higher than those of the one-year-old greenhouses,and the contents of Ca2 +,Na+,Cl-,NO3-and SO42 increased in the greenhouses with the planting years of four to five years,but decreased in the greenhouses with the planting years over six years.The contents of K+,Mg2 + were increased with planting years prolonged,while the HCO3 content decreased.Generally,the pH value of protected vegetable fields were decreased to 4.06 finally as the planting years increased." @default.
- W2361383293 created "2016-06-24" @default.
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- W2361383293 date "2013-01-01" @default.
- W2361383293 modified "2023-09-27" @default.
- W2361383293 title "Changes of Nutrients and Salt Accumulation in Protected Vegetable Fields in Songjiang District of Shanghai City" @default.
- W2361383293 hasPublicationYear "2013" @default.
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