A conventional electric water heater will come with a black wire and a red wire which are connected to the wires of the same color as described above. The ground wire is attached to the green ground screw which is in the same wiring junction box compartment which is built into the top of the water heater.
Which option is best depends upon several factors. But moving your garden soil pH lower may be as simple as adding fertilizer or mulch. Of course, all methods of changing soil pH involve adding something to the soil. Itâs just a question of the type of soil amendment youâll be using, and in what quantity.
Test the pH of your soil. Use litmus paper or another testing kit to determine how acidic or neutral your soil is. Onions need a pH range of 6 to 7.5 in order to grow. 1  Drop the pH by digging in manure or compost.  Raise the pH by adding ground agricultural lime into the soil.