摘要
为了探明生物炭施用量对土壤和烤烟钾的长期效应,在贵州省毕节市开展了 5 年的田间定位试验.采用单因素(生物炭用量0、5、15、20、40 t/hm2)随机区组设计,结果表明:生物炭施用后的首年对土壤速效钾含量的增加效果最大,2 种土壤上增幅分别为 664.21%和 223.09%,随后趋于稳定,5 年平均增幅分别为 82.36%和 39.80%.当生物炭用量分别为 15、20、40 t/hm2 时,两种土壤上速效钾含量 5 年平均分别显著提高 72.2%和127.3%、251.1%和 22.3%、31.9%和 47.6%.同时,烟叶钾含量也显著增加,增幅分别为 18.2%和 18.4%.综合来看,生物炭用量为 15 t/hm2 对提高土壤速效钾和初烤烟叶钾含量效果最佳.总之,适量施用生物炭能显著提高土壤速效钾含量和增加初烤烟叶钾含量.
Abstract
In order to investigate the long-term effects of biochar application rate on soil available potassium and tobacco potassium contents,two 5-year positional experiments were conducted in Bijie City,Guizhou Province.A randomized block design with single factor(biochar application rate at 0,5,15,20,40 t/hm2)was used in this study.The results showed that the increment in soil available potassium content was the highest in the first year after biochar application,which was 664.21%and 223.09%in two soils,respectively,and then stabilized,with a 5-year average of 82.36%and 39.80%,respectively.Compared with the control(no biochar),5-year average increase of available potassium content was 72.2%and 127.3%,251.1%and 22.3%,31.9%,47.6%for the two soils,respectively,when the biochar application rate was 15,20 and 40 t/hm2.In the meantime,total potassium content in tobacco leaves increased by 18.2%and 18.4%for the two soils,respectively.The results of these 5-year field experiments showed that the best biochar application rate was 15 t/hm2 for these two soils in order to increase the soil available potassium content and cured leaf potassium content.In conclusion,the application of biochar could significantly increase the soil available potassium content and cured leaf potassium content.
基金项目
贵州省烟草公司毕节市公司项目(2022520500240197)
NETL
NSTL
万方数据