Problem Set #3, Question 3

Hello!

For part b) would I be correct in saying that higher amounts of sodium lead to more dispersion, and that this is demonstrated by relative ESP, pH and BS values?

For part d) is this the same idea as when we talk about dispersion of clay particles and there being spots that dry out faster than others?

Thank you!

MadelineWoodley (talk)‎

Madeline, you are on the right track. For part b) be specific with respect to values for parameters such as ESP, pH and/or BS in your answer.
For part d) first consider the impact of dispersion on soil properties, then you can relate that to implications for plant growth

SandraBrown (talk)‎

Thank you!

I was also wondering if, for question 4, you are looking for us to answer with the more general organism (ie; bacteria) or if the question is looking for a more specific answer (ie; cyanobacteria)?

MadelineWoodley (talk)‎

Be as specific as you can

SandraBrown (talk)‎

For the question 4 on PS 3 I put for a) cyanobacteria and b) Algae and I got 2/4 for the question, I was wondering which one was wrong, or are both?

KelseyBowman (talk)‎

Kelsey, you are correct for part b)
For a) consider a different N fixing organism that associates with legumes

SandraBrown (talk)‎

Hi, I am just reviewing PS3, Q3 part a) I was wondering how pH would effect sodium levels?

KelseyBowman (talk)‎

pH is used in the differentiation of sodic soils; for a soil to be classified as sodic is has ESP > 15 AND pH >8.5
Recall Na is a base forming cation, and is very soluble relative to Ca, Mg, K salts thus the high pH (>8.5)

SandraBrown (talk)‎