Ukukhiqizwa, ama-fatry akhokha ukunakwa kwe-sepcial ekutholeni indawo yemvelo kanye nokusetshenziswa kwamandla amasha. Thatha "umhlaba oluhlaza" njengesiqondiso sokukhiqiza.
Ama-mainproducts ahola i-nitrate, i-zinc sulphate, i-sodium metabisulphite, kanye ne-sodium perpupphate.
IHhovisi Lethu
