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。     

Potato growth and nutrient diagnosis as affected by systemic pesticide and physiological growth stage

Abstract

Growth and chemical composition of crop plants may be subject to alteration by systemic compounds employed for pest control. A field study was implemented to examine the effects of aldicarb on growth, chemical composition, and nutrient diagnosis of a potato crop at various growth stages. Aldicarb use resulted in increased dry matter production of leaves, stems, and tubers, and final fresh tuber weight during the second year of the study. Higher tuber yields were likely due to greater photosynthetic capacity because the increase in leaf dry matter production with time was greater in the aldicarb treatment than in control. Leaf nutrition was not influenced by aldicarb; however, leaf nutrient content varied greatly with growth stage. Similar nutrient status evaluations were generated by DRIS, regardless of pesticide treatment or growth stage. DRIS was able to diagnose nutrient limitations as early as tuber initiation