Comparison of Different Indicator Plants in Tobacco-growing Soil Nutrient Systematic Approach
The tobacco-growing soil nutrients limiting factors were identified by systematic approach to compare the differences between sorghum and tobacco as indicator crop, which taking advantage of soil nutrition testing, adsorption experiment and pot experiment in Sangzhi county of Zhangjiajie municipality. The results showed that: the contents of available Ca, Fe, Mn and B in tobacco-growing soil of Sangzhi county were rich; The nutrients limiting factors of tobacco-planting soil and the element order of abundance and deficiency were basically the same, which were indicated by grain sorghum and tobacco; that order is N, P, S, Cu. As a general indicator crop in soil nutrient systematic approach, sorghum could also be applied to tobacco-growing soil nutrient systematic approach. But there were some indicating differences between two crops for their different nutritional characteristics. The indicator crop selected for the pot experiment when soil nutrient status systematic approach was used is best consistent with the growing crops in field to obtain a more scientific and rational guidance in production practices.
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