please help me out

Question

A farmer has been using calcium for decades to help maintain chemical balance in the soil used to grow his crops. Unfortunately, the farmer's calcium supplier has been steadily increasing the price of their product to the point that the farmer no longer wants to buy calcium. Assuming they are offered at the same, cheaper price, should the farmer turn to magnesium (Mg) or potassium (K) as a new soil nutrient? E

Answer 1

Mg because it has simillar chem properties since it is also Goup 2