This product is an on board nitrogen generator. Most companies purchase nitrogen in cylinders at about 2000 p.s.i. We at Pit Crew Tire Service have chosen to invest in a system that will create nitrogen on demand and store it in an on-board 80 gal storage tank at low pressure. (170 p.s.i. for safety concerns) The USA trails European tire technology by about 10 years.
The pH scale indicates acidity or alkalinity. A soil with a pH number below 7 is acid, while one with a pH above 7 is alkaline. Garden plants typically grow best in neutral or slightly acid soil (pH 7 or slightly below; see illustration at left).
Another way soil becomes acidic is the use of high-nitrogen synthetic fertilizers. These fertilizers are usually ammonia-based, which increases soil acidity. How to Test Soil Acidity. There are a few methods you can use to test your soil's acidity. The first is simply to send a soil sample to your local cooperative extension office and have them analyze it for you.