How much limestone with a CaCO3 equivalent of 90% would you need to apply to eliminate exchangeable aluminum in an Ultisol with CEC = 8 cmolc /kg and an aluminum saturation of 60%? Discuss the...

How much limestone with a CaCO3 equivalent of 90% would you need to apply to eliminate exchangeable aluminum in an Ultisol with CEC = 8 cmolc /kg and an aluminum saturation of 60%?

Discuss the significance of soil pH in determining specific nutrient availabilities and toxicities, as well as species composition of natural vegetation in an area.