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Author Question: You find that the CEC of a sandy loam soil at pH 5.0 is 8 cmolc/kg and at pH 8.2 it is 14 cmolc/kg. ... (Read 79 times)

cdr_15

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on: Jul 22, 2018
You find that the CEC of a sandy loam soil at pH 5.0 is 8 cmolc/kg and at pH 8.2 it is 14 cmolc/kg. What is the most likely reason for this difference?
 
  A) removal of Al atoms from tetrahedral layers at low pH
  B) ionization of carboxyl and phenolic groups to release H+ ions
  C) removal of Al3+ ions from the exchange complex at higher pH
  D) replacement of trivalent Al3+ ions with divalent Ca2+ ions at high pH
  E) increase in the pH-dependent charges on 1:1 type silicate clays

Question 2

If supplied with a suitable nutrient solution, plants can grow normally without any soil at all.
 
  Indicate whether the statement is true or false
The Nature and Properties of Soils ¦ Weil, Well, Brady ¦ 15th Edition
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Toya9913

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Reply #1 on: Jul 22, 2018
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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cdr_15

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Reply 2 on: Jul 22, 2018
Gracias!

robbielu01

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Reply 3 on: Yesterday
Excellent

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