Search
×

Sign up

Use your Facebook account for quick registration

OR

Create a Shvoong account from scratch

Already a Member? Sign In!
×

Sign In

Sign in using your Facebook account

OR

Not a Member? Sign up!
×

Sign up

Use your Facebook account for quick registration

OR

Sign In

Sign in using your Facebook account

Shvoong Home>Science>Agronomy - Agriculture>Effects of insoluble decomposition products of manures on adsorption and desorption of copper and Summary

Effects of insoluble decomposition products of manures on adsorption and desorption of copper and

Article Summary   by:TsingHua     Original Author: Plant Natrition and Fertilizen Science
ª
 
The effects of the insoluble decomposition products of three manures (rice straw, pig manure and Chinese milk vetch)and the insoluble residues of two soils after being incubated under submerged conditions with the three manures on deposition, adsorption and desorption of Cu and Cd were studied When the initial concentration was 10 -4 mol/L, the deposition of Cu was promoted in low pH range (<6), while inhibited in higher pH range (>6) by the insoluble decomposition products When the initial concentration was 10 -5 mol/L, the deposition was promoted with a greater degree All the three organic decomposition products enhanced the deposition of Cd with a smaller degree than that of Cu At the same pH, larger amount of Cu and Cd was adsorbed by the red soil incubated with the manures than that incubated without them The pH values of the red soil were raised by the incubation with the three manures, then the adsorption was promoted further As for the fluvo aquic soil, the pH raising effect of the incubation with the manures was the main cause for promoting the adsorption of Cu It was concluded that the pH raising effect and the complexation enhancing effect was the major cause for the insoluble decomposition products free or incorporated with the soils to promote the deposition or adsorption of Cu and Cd The re solution of the insoluble products in higher pH range may lead to a reduction of the deposition of Cu and Cd The Cu and Cd adsorbed by the red soil incubated with the manures was desorbed more difficultly than that incubated without manures
Published: March 20, 2001   
Please Rate this Summary : 1 2 3 4 5
Translate Send Link Print
X

.