Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to buy organic dry fertilizers [title] Test your soil's ph and nutrient levels. [step] Before selecting an organic dry fertilizer, use a soil testing kit to find out what kinds of amendments your soil needs. Buy a home soil test kit from your local garden center, or send a sample to a soil testing lab near you.

Ending1: Perform an online search for " organic dry fertilizers " or " nutrient testing kit. " [title] Check your soil's ph levels. Ending2: [substeps] Use a test kit or request a lab test that shows both soil ph and nutrient levels. Many universities offer soil ph and nutrient analysis through their agricultural departments. Ending3: [title] Determine how much more fertile soil you need before using a dry fertilizer. [step] The amount of soil you need vary by region, but generally , 30% to 35% is optimal. Ending4: [substeps] Chemical formulations (e.g., peat) can affect your soil, so you should prepare your soil beforehand to have it tested. [title] Use organic latex fertilizer.

Answer format: ending1/ending2/ending3/ending4