植烟土壤养分系统研究法中不同指示作物的比较

利用土壤养分测试、吸附试验和作物盆栽试验,对张家界桑植县植烟土壤养分限制因子进行系统诊断,以便比较高粱与烤烟在指示植烟土壤养分限制因子方面所存在的差异。结果表明,桑植植烟土壤有效Ca、Fe、Mn和B含量丰富;高粱与烤烟在指示桑植植烟土壤的养分限制因子及其亏缺顺序上基本相同,即N、P、S、Cu等,故土壤养分系统研究法中高粱作为一种通用的指示作物,基本上也能作为指示植物应用于植烟土壤养分的系统研究。但两种作物不同的营养特性使其指示作用存在一定差异,为使土壤养分状况系统研究法能够更科学合理的指导生产实践,其盆栽试验所选取的指示作物最好与田间种植作物一致。

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.