powder sulphur in Agriculture Sulfur is necessary for the growth and development of plant life. The majority of all sulfur in the U.S. is used to make sulfuric acid, and about three quarters of it is used in fertilizers, according to Chemistry Explained. Plants are dusted with sulfur powder as an insecticide. Agricultural sulfur is produced in the form of flowable sulfur for use on vine crops. Wettable powders are applied by dusting or spraying plants. Dusting sulfur is also a fungicide. Many people today are looking for more organic gardening methods. Sulfur is a perfect solution for organic...