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《Journal of Anhui Agricultural Sciences》 1991-04
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P levels and the availability of Zn, Fe and Cu in soil

Cheng Suzhen  
Three kinds of soil with different properties—red yellow earth.yellow brown earth and shajiang meadow soil were treated with 9 P levels(calculated according to P_2O_5)from 0-150mm in 15 30 days respectively. Theresults indicated that the available Zn contents of soil treated with all P leve-ls were inhibitorily and below soil native Zn contents at the first 15 days, andraised in varying degrees with an obvious difference, which varied with thetexture, pH value, Zn contents of soil after 30 days. Very significant negative correlation of available Zn content with P levels ofred yellow earth was observed at the first 15 days, whereas, both yellow brownearth shajiang meadow soil showed the opposite, After 30 days, the availableZn content of red yellow earth rose to 2-3 ppm, but no significant correlationwith P levels was there, and both yellow brown earth shajiang meadow soilstill had a significant positive correlation. the available Fe content of the soilswere very significant negative correlation with P levels during the whole time.The available Cu contents of both red yellow earth shajiang meadow soil treatedwith any P levels presented below the critical limitation at the first 15 days, andraised just above the critical limitation after 30 days, but yellow brown earthhad a very significant positive correlation between available Cu content P lev-els at the first 15 days, no significant correlativity was seen after 30 days, allcontents were above soil native value and below the critical limitation. showinga serious deficiency in copper.
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