Testo Drive 365 Because the soil is the decisive factor for plant development. In ecological crops, no artificial fertilizers are used, only fertilization with compost, i.e. natural fertilizers. Thus, the soil contamination is smaller. But besides, everything takes place in the same environment. After all, the air is not separated for organic farming. The plant breathes air and draws from it what it needs. By the way, it gets a lot of dirt and heavy metals. http://www.karstcountry.com/ https://www.facebook.com/Testo-Drive-365-642875329490187/