关键词: 聚类分析, 聚类分析

Abstract:

In this paper, in order to promoting slow/controlled release fertilizers (SRFs) applying to tobacco production, achieve flue-cured tobacco simplified cultivation production and improve quality of tobacco, the research and application literatures of SRFs were summarized that were published. Firstly, the SRFs concept, types and characteristics were introduced, and then the effects of SRFs in tobacco production were summarized, the results showed that, the SRFs could promote the growth and development of tobacco, enhance resistance and increase the potassium content of tobacco leaf. At the same time, the chemical composition of flue-cured tobacco leaves is promoted coordinating, the appearance and sensory quality of flue-cured tobacco leaves was improved and the utilization rate of fertilizer and economic indicators were improved. As a result, the production cost was reduced and the income was increased. In the end of paper, the problem about slow/controlled release fertilizers research in tobacco production was single and not system. The production and industrialization of slow/controlled release fertilizers was lack of standard. Potash fertilizer was difficulty to release slowly. The material which used to envelope was cost high and easy to pollute the environment. The slow/controlled release fertilizers application prospect was given in this paper. The manufacturing standards and quality control standards which conform to China's actual situation should be made. The new material which was cheap, no pollution and suitable for coated potash fertilizer was the difficulty future work for slow/controlled release fertilizers in tobacco research.