What components (other than fertilizer chemicals) are in the ...

[newbem]

What components (other than fertilizer chemicals) are in the classical greenhouse root substrate and what role does each provide?
 
  What will be an ideal response?

Question 2

What problems can occur from using pine sawdust in a greenhouse root substrate?
 
  What will be an ideal response?

[livaneabi]

Answer to Question 1

Field soil provides a nutrient reserve, support, and a water reserve.
Coarse sand provides aeration and support. Peat moss provides for aeration,
nutrient reserve, water reserve, and support.

Answer to Question 2

The sawdust can decompose rapidly, tying up nitrogen, thus
causing a deficiency of nitrogen.

[newbem]

Gracias!

[skipfourms123]

Thanks for the timely response, appreciate it