48th TWC, Tob. Work. Conf., 2018, abstr. 28

Studies on the soil indexes influencing tobacco growing in central China

Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China

Due to intensive cultivation, soil degradation has become a serious problem in some traditional tobacco growing areas in China. How to identify the factors representing for soil degradation and develop suitable soil conservation measurements has caught more and more attention. In this study, taking a traditional tobacco growing area in central China as an example, 78 mixed soil samples from fields with different soil quality were collected and divided into high, middle, low grades according to leaf quality, yield, soil fertility, and probability of soil-borne disease. 32 indexes including soil physical, chemical and biological properties were compared between soils with different grades. The results showed that with soil quality from high to low grade, field capacity, water-stable aggregates, soil clay, total porosity, organic matter, available N and P, active carbon, protein, sucrose activity, Shannon index of fungi decreased gradually, while soil bulk density, soil hardness and soluble chlorine increased gradually. Significant differences were observed on field capacity, water-stable aggregates, organic matter, available N, active carbon, protein, sucrose activity and Shannon index of fungi. The abundance of Acidobacteria and Eurotiomycetes in high-grade tobacco-planting fields were also significantly higher than those in low-grade tobacco-planting fields. These results suggested that in Central China, physical and biological properties other than chemical indexes have become the vital factors influencing tobacco growing. (Reprinted with permission)