Sulphur Status Of Major Soils And Effects Of Sulphur Application On Crops In Lanshan District Of Southern Shandong Province

Sulphur is one of the essential nutrients for crop growth. Application of S-fertilizer can improve the crop yield and the quality of agriculture products. Three extracted methods were selected to determine soil available Sulphur. Sulphur application experiments were conducted to study the effects on crops in order to provide the substantial base for Sulphur application of farming measurements.Soil available Sulphur was extracted with KCl, CaCl2, Ca(H2PO4)2 and determined by terbidimetric methods. The results showed that the relativity was remarkable between soil available Sulphur extracted by KC1 and Sulphur uptake of wheat and soil total Sulphur. Thus KCl was a suitable extractant for soil available Sulphur.The average of soil available Sulphur extracted by KC1 in 15 soil samples in Lanshan District was 23.9 mg/kg. The average of soil total Sulphur was 192.7 mg/kg. The Sulphur content varied in different type of soil. Among fertilized soils, cinnamon soil, black clay soil and paddy soil had high Sulphur content while fluvoaquic soil and burozem had low Sulphur content. The soil available Sulphur was affected by different land use types, the result showed that rotation of paddy and dryland crops would increase the content of soil available Sulphur.The pot experiments of Sulphur fertilizers application on cole, soybean and radish were conducted in fluvoaquic soil and burozem. Sulphur fertilizer application could significantly improve the growth and the yield of cole with about 19.5% increase in fluvoaquic soil while the effects on soybean and radish were not so obvious. The Sulphur content in the plant was increased based on the Sulphur application. The result showed that the sulphur of the cole increased 22.1 % growing in burozem and the sulphur of radish increased 8.7% in fluvoaquic soil with remarkable significance. N content in the plant was unchanged based on the increased Sulphur. The content of soil available Sulphur was decreased after harvesting cole and radish. But the content of soil available Sulphur was remarkably increased after harvesting soybean.Field experiments were also done to test Sulphur application effects on wheat and rice. Sulphur application could increase the yield of wheat more than 11.0%; this measurement also improved the growth of rice seedling and the yield of rice.