[State of soil available sulphur and its requirement along Huaihe River region].
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 fertization, 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 x 10(4) hm2, yellow cinnamon soil had an area of 2.0 x 10(4) hm2, and fluvisol was 6000 hm2. The total area of lacking S was 9.6 x 10(4) hm2, accounted for 25.06% of total cultivated area. The total area of potentially lacking S was 1.6 x 10(5) hm2, 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 x 10(5) hm2 farmland in three counties and one district of Bengbu was about 3.0 x 10(6) kg and 1.2 x 10(6) kg in the recent and far future, respectively.
Yu
Z
Z
Anhui Agricultural University, Hefei 230036.
Zhang
C
C
Wang
S
S
D005308:Fertilizers; D012987:Soil / Q000032:analysis*; D013455:Sulfur / Q000032:analysis*
D005308:Fertilizers; D012987:Soil; D013455:Sulfur