There is several real ...

There is several real important factors.   One is the CNC ratio in the soil,  Another is the Bacteria, Fungus, and other living organism, (enlivened soil) to help break down the soil and give the plant the necessary nutrients to absorb.  Next is the Nitrogen , Phosphorus, and Potash which are easy to administer but it should e governed by the soil prior to preparation so that you and make sure you are putting the correct amount for the type of crop you with to grow.  Next is an addition of a metered amount of Lignosulphonate  (added to your fertilizer blend) to allow moisture to penetrate into the soil but not allow the moisture in the soil to be lost due evaporation from the hot sun.