| Soil culture experiment and frame experiment were carried out to study effects of application of elemental sulfur and phosphate rock. According to phosphate rocks resource and soil condition of China, from sustainable development and developing highly-effective complex fertilizer we were to produce and spread a part of mixed fertilizer on sulfur and phosphate rocks that were applied directly and supplied more phosphorus resource for agricultural production. Thus we might reduce environmental pollution and improve ecological condition of soil and crop quality. The results showed as follows:Whether low sulfur level or high sulfur level, the application of phosphate rock with sulfur could increase soil available P and decrease soil pH significantly. Applying S-oxidizing bacteria affected on soil available P, soil pH, the content of every fraction of inorganic phosphorus, soybean yield, soybean protein and total phosphorus of soybean, but affected insignificantly. Applying soil phosphorus activator affected on them significantly, and effects of application of S-oxidizing bacteria with soil phosphorus activator was the best.Jiang Baifan and Gu Yichu's Fractionation of soil inorganic phosphorus was used to divide inorganic soil phosphorus of black soil into six parts. Among them, Ca-P was predominant in four growing periods. During the whole growing periods of soybean, the change of trends on fractions of soil inorganic P showed that Ca2-P, Cag-P, AI-P and O-P decreased, but Ca10-P and Fe-P increased.Ca2-P was the most available to soybean in black soil. Al-P was also transformed into available P directly, Cag-P and Fe-P were important and available phosphorus and influenced soil available P by transforming into Ca2-P and Al-P, Cai0-P and O-P was potential phosphorus source and influenced available P indirectly by transforming into Cag-P, but had little contribution to available P.Postgraduate: Yin Yunfeng Major: Soil Science Supervisor: Prof. Xu Jinggang...
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