Evaluation of a sprayable elemental sulfur fertilizer under field conditions in Alberta

Elemental sulfur (ES) fertilizers have high S content but may not be effective in the year of application due to time required oxidize. Rapid oxidation possible if ES has a large surface area contact with soil. We evaluated efficacy Sulgro 70, micronized fertilizer that is sprayed onto soil surface, eight field trials southern and central Alberta over 2 yr period. Under dry conditions Alberta, relative 70 increase supply ion-exchange membranes was 22% during first 4 wk period after seeding 53% second seeding, compared ammonium sulfate (AS) on surface. wetter variable (51%–201%) 56% seeding. Based increases biomass concentration three where unfertilized control had low (<3 g S·kg −1 ), 34%. Canola seed yield increased by AS or any trials. oxidized appreciably 8 and, suitable management, potential meet canola requirements application.