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Author Question: If you wanted to reduce the percentage sodium saturation from 30 to 5 in a sodic soil with a CEC of ... (Read 50 times)

Lobcity

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If you wanted to reduce the percentage sodium saturation from 30 to 5 in a sodic soil with a CEC of 20 cmolc/kg, how many cmolc's of CaSO4 would need to react with 1 kg of this soil?
 
  A) 10 B) 2 C) 20 D) 30 E) 5

Question 2

Which of the following statements about soil erosion is not true?
 
  A) Less than 20 percent of the total soil erosion in the United States comes from croplands.
  B) Soil erosion losses of potassium exceed those of nitrogen and phosphorus.
  C) Downstream off-site costs of erosion are often higher than those in upstream fields from which the soil came.
  D) The rate of soil erosion loss in the United States declined from 1980 to 1995.
  E) Soil erosion losses per hectare of cropped land are higher in Asia and Africa than the United States.


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alexanderhamilton

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Lobcity

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Reply 2 on: Jul 22, 2018
Gracias!


patma1981

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Reply 3 on: Yesterday
Excellent

 

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