巨大芽孢杆菌和枯草芽孢杆菌混合对马铃薯生长及土壤微生物含量的影响

采用随机区组盆栽试验,以蒸馏水处理为对照,研究33.33%(T1)、16.67%(T2)、8.33%(T3)的巨大芽孢杆菌和枯草芽孢杆菌混合菌剂对‘费乌瑞它’马铃薯生长生理及其根际土壤微生物含量的影响。结果表明,T1、T2和T3都能提高‘费乌瑞它’马铃薯块茎形成期和块茎膨大期叶片的净光合速率和超氧化物歧化酶、过氧化物酶、过氧化氢酶活性,也能提高收获期的块茎产量和水分利用率,根际土壤的细菌、真菌和放线菌含量增加,其中,T2处理的效果最明显,块茎形成期和块茎膨大期的净光合速率分别为7.17、6.40μmol/(m~2·s),与CK相比,T2处理的每盆块茎干重提高18.6 g,水分利用率提高1.64 g/kg,土壤菌落总数提高6 877.17 CFU/g。

Effects of Bacillus megaterium and Bacillus subtilis on growth physiology of Solanum tuberosum L. and microbial biomass in rhizosphere soil

In order to research the effects of different concentration of Bacillus megaterium and Bacillus subtilis on physiological characteristics and microbial biomass in rhizosphere soil of potato, random blocks designed pot experiments were conducted by adopted favorita, a kind of potato, as testing material. Experiments respectively treated with 33.33% (T1), 16.67% (T2) and 8.33% (T3) of bacteria agent, and control group (CK, distilled water) were designed. The results showed that treatment of T1, T2 and T3 could improve leaf net photosynthetic rate, activity of superoxide dismutase, peroxidase and catalase in tuber formation stage and tuber expansion stage, as well as in improving tuber yield, water use efficiency, bacteria biomass, fungi and actinomycetes in rhizosphere at harvest stage. The net photosynthesis rate in treatment of T2 were 7.17μmol/(m2·s) and 6.40μmol/(m2·s) in tuber formation stage and tuber expansion stage, respectively, higher than that of CK. The tuber dry weight, the water use efficiency and the microbial biomass in rhizosphere soil of T2 was 18.6 g/pot, 1.64 g/kg and 6877.17 CFU/g, respectively, all higher than that of CK.