Abstract: This paper investigated the available S contents of yellow cinnamon soil,fluvisol,shajiang black soil and paddy soil,which were developed from loessial ancient-river alluyium,recent loess-flooding deposit,and Xiashu loess.The input and output,and the abundance and deficiency of soil available S were studied in combination with the mode of land utilization and fertilization,and the soil demands of S was predicted.The results showed that the content of soil available S was decreased in the order of paddy soil>shajiang black soil>yellow cinnamon soil>fluvisol,and there was more S in irrigated land than in dry field in case of different land utilization.From the viewpoint of parent material,the deficiency frequency of soil available S was in the order of loessial ancient-river alluvium>Xiashu loess>recent loess-flooding deposit,and the potential deficiency frequency of S was loessial ancient-river alluvium>recent loess-flooding>Xiashu loess.As for soil type,the deficiency frequency of soil available S was in the order of deposit shajiang black soil>yellow cinnamon soil>fluvisol>paddy soil,and the potential deficiency frequency of S was paddy soil>fluvisol>shajiang black soil>yellow cinnamon soil.Shajiang black soil had the largest area of lacking available S,which amounted to 7.0×10⁴hm²,yellow cinnamon soil had an area of 2.0×10⁴hm²,and fluvisol was 6000hm².The total area of lacking S was 9.6×10⁴hm²,accounted for 25.06% of total cultivated area.The total area of potentially lacking S was 1.6×10⁵hm²,accounted for 42.04% of the total.According to the current available S content in soils and the S demands for high yielding crops,the S demands of 3.8×10⁵hm² farmland in three counties and one district of Bengbu was about 3.0 ×10⁶kg and 1.2×10⁶kg in the recent and far future,respectively.

Key words: Region along Huaihe River, Available S, Demand, Abundance and deficiency, Frequency distribution, climate productivity change, influencing factors, maize, yield improving potential., climate scenarios