Exogenous glucose modulated the diversity of soil nitrogen-related bacteria and promoted the nitrogen absorption and utilisation of peanut

Abstract

Exogenous carbon (C) not only regulates plant growth but also provides energy for microbes and improves the soil environment. We hypothesised that exogenous C could improve plant growth by affecting the soil environment. Therefore, pot experiments were conducted and peanut cvs. Huayu 22(H) and NN-1(B) were used under three different treatments (the control, single nitrogen (N), and N combined with glucose (CN)). The results showed that the abundance and diversity of N-fixing bacteria are obviously influenced by the C and N, and exogenous C can promote the restoration of microbial diversity. The relative abundances of Burkholderiales were increased under HCN and BCN to 9.8% and 9.5%, respectively, compared to the control (3.9%, 2.5%). The abundance of N fixation bacteria increased mainly due to the soil nutrient change. In comparison with the single N treatment, the addition of the C significantly decreased the soil NH4+-N and NO3–-N contents by 31.0% and 13.3%, respectively. And the activities of soil urease and nitrogenase were significantly increased. Compared to the control, single N significantly limited the root development, while the addition of C played a promoting role in root growth. Plant N accumulation increased compared with the control, but there was no significant difference between N treatment and CN treatment. These results indicated that exogenous C promoted soil microorganism activity and strengthened plant growth by changing the soil environment.

Partitioned nitrogen fertilisation in peanut rhizosphere and geocarposphere drives specific variation soil microbiomes

“…For this study, we performed pot experiments in a greenhouse with a transparent plastic-covered roof and four open sides. The soil used for cultivating peanut plants was collected at 0-20 cm depths from nearby agricultural fields, the physical and chemical properties of the soil are as follows as described by Liang et al (2022): total N, 0.9 g/kg; organic carbon, 9.7 g/kg; available P, 96.7 mg/kg; available K, 79 mg/kg; and pH = 5.9. The pots were arranged in a completely randomised block design, with three replicates for each treatment.…”

Rhizosphere Ventilation Effects on Root Development and Bacterial Diversity of Peanut in Compacted Soil

“…Peanuts ( Arachis hypogaea L.), important nitrogen (N)-fixing crops, play an important role in soil fertility and fertilizer input to soil [ 1 ]. As an underground seed crop, peanut roots are sensitive to soil hard pan or compaction layer, seriously affecting the growth of peanuts.…”