关键词: SQL Server, SQL Server, 农业气象数据库, 管理系统, 设计与实现

Abstract:

The physical and chemical properties of different tobacco cultivation soils and distribution of the characteristics of arbuscular mycorrhizal fungi and their relationships were studied. In the field experiments were carried out and parts of tobacco areas in Shandong Province and Yunnan Province as examples, which by agricultural analysis to analyze the physical and chemical properties of tobacco cultivation soil and by sucrose density gradient centrifugation to separate arbuscular mycorrhizal fungi spores. The results showed that the physical and chemical properties of tobacco cultivation soils were affected significantly by arbuscular mycorrhizal fungi, tobacco cultivation areas with high arbuscular mycorrhizal fungi spores in soil, the soil organic matter, total nitrogen, total phosphorus, total potassium and nitrogen, phosphorus and potassium content were significantly decreased, changes in available nutrients more obviously, but the pH of the soil had no obvious relationships with the amount of arbuscular mycorrhizal fungal spores. It was concluded that there was a big difference between the content of nitrogen, phosphorus, potassium and soil organic matter in the residue of tobacco cultivated sites, addition to no significant difference in pH. Tobacco cultivation in Qingdao residual soil nitrogen, available phosphorus and potassium content were significantly lower than the other regions showed that arbuscular mycorrhizal fungi in soil maybe significantly promote tobacco available nutrient absorption and utilization of soil a certain extent.