Plant growth promoting effects of indigenous rhizosphere and endophytic bacteria on soil fertility and black pepper (Piper nigrum) yield at Bangka Belitung

Abstract

Black pepper cultivation in Bangka Belitung is commonly followed a shifting cultivation method. This is due to the low soil fertility. The study aimed to obtain the best combination and concentration of indigenous rhizosphere and endophytic bacteria to improve soil fertility and enhanced growth and yield of black pepper. The study was set up in a complete randomized block design, 9 treatments and 3 replications. The treatments were the combinations of the types and concentrations of the bacterial isolates, i.e. (1) Control, (2) Endophytic bacteria A, (3) Combination of Endophytic bacteria B + Bb. chosinensis+ Rhizobacteria A, (4) Combination of Rhizobacteria B + Endophytic bacteria A+ Endophytic bacteria C, (5) Combination of Endophytic bacteria B + Endophytic bacteria C + Endophytic bacteria D at 105 and 108 cpu ml−1 respectively. Endophytic bacteria were capable to boost the growth and yield of black pepper, also improved the soil chemical properties. The best treatment combinations were the mixture of of bacteria, i.e. (1) Psedomanas sp.+ Brevibacillus sp+Mesorhizobium sp., (2) Bb. sp1 +Bb. sp2+Bacillus sp., and (3) Brevibacillus sp +Bb sp1+Bacillus sp. The study implies that rhizosphere and endophytic bacteria are potential to be developed for reducing fertilizer use in black pepper cultivation.

Phosphorus-solubilizing bacterial endophytes, Burkholderia silvatlantica L-VT09 and N-VT06, in improving characteristics of acid sulfate soil and pineapple yield

“…The interaction analysis result showed that at the same 100% P according to the recommendation, yield in the treatment without bacteria was lower than those in the treatments supplied with the mixture B. silvatlantica L-VT09 and N-VT06, with only the L-VT09 strain and with only the N-VT06 strain (Figure 2). This was in accordance with the study by Kartikawati et al (2020), where supplying the mixture of bacterial endophytes Pseudomonas sp., Brevibacillus sp., and Mesorhizobium sp. promotes growth and yield in black pepper.…”

“…Levels of P fertilizer and supplementations of bacteria had not affected values of pHH2O, pHKCl, EC, total N and total P in soil yet (Table 2). According to Kartikawati et al (2020), the bacterial endophytes Pseudomonas sp., Brevibacillus sp., and Mesorhizobium sp. are able to improve the chemical characteristics of soil for pepper.…”

The utilization of plant growth-promoting bacteria to enhance stevia (Stevia rebaudiana) herb yield at low land

“…Bacillus pacificus strain EB422 is an endophytic bacterium, and Brevibacillus parabrevis strain GF13 is a rhizosphere bacterium. Both bacteria produce IAA, solubilized P, and fixed N [19]. However, the combination had an insignificant effect on the growth and yield of stevia.…”