Suitability of SDA products to meet the sulphur demand of agricultural crops

摘要

Targeted sulphur containing fertilization to meet the requirements of agricultural crops is necessary since the desulphurization of industrial emissions has resulted in a continually decreasing sulphur deposition. This is the reason why the market for sulphur containing fertilizers is growing. Desulphurization products from the Spray Dry Absorption (SDA) contain calcium sulphite and calcium sulphate at a ratio of about 8:1. Mostly depending on their fly ash contents, their heavy metalconcentrations are differing. Their use as sulphur fertilizer would extend their re-utilization possibilities. VGB are financing a research project dealing with the suitability of SDA products to cover the sulphur needs of agricultural crops. Inthree-year field studies the sulphur fertilcisation with SDA products with varying fly ash contents has been investigated. The present paper is an agricultural, ecologic and economic assessment of the results obtained.