不同连作年限植烟土壤养分状况分析

Analysis of Nutrient Status for Tobacco-growing Soil with Different Continuous Cropping Years

利用吸附试验和盆栽试验对桑植县白石乡不同连作年限植烟土壤养分状况进行了系统研究,以确定土壤中相应的养分限制因子。结果表明,在不同连作年限植烟土壤中,N、Mg养分始终是较为重要的限制因子,且N的限制作用最大;但随着植烟年限的延长,土壤酸度对烟株生长的限制作用越来越强。因此,在当地烤烟施肥的过程中,不仅要关注N等大量养分的施用,同时也要补充适量的Mg;尤其是长期连作的植烟土壤上还要注意施用石灰以中和土壤酸性。

The adsorption test and the pot experiment were conducted to study the nutrient status of tobacco-growing soil with different continuous cropping years in Baishi Town,Sangzhi County,and the nutrient limiting factors in soil were determined.The results indicated that in the different continuous cropping years of tobacco-growing soil,N and Mg always are the important limiting factors,and the N has the largest restriction function;but with the extension of tobacco planting years,the limit effect of soil acidity on growth of tobacco will become stronger and stronger.Therefore,in the local tobacco fertilization process,it not only should pay attention to the large need fertilizer nutrients such as N fertilizer,but also need to apply appropriate amount of Mg,especially pay attention to apply lime on the long continuous cropping tobacco-growing soil to neutralize soil acidity.