Application of PGPR (plant growth promoting Rhizobacteria) to stimulate growth and improve productivity of rice on organic based

Abstract

Plant Growth Promoting Rhizobacteria (PGPR) has three functions, namely: as a growth-promoting substance, as a biocontrol against pathogens that harm plants, and as an organic fertilizer to reduce farmers’ dependence on chemical fertilizers and chemical pesticides. This study aims to obtain the right concentration of PGPR to spur growth and increase rice production. Field research has been carried out in Taratara Dua Village, West Tomohon District, Tomohon City from April 2021 to September 2021. The materials and tools used are seeds rice Ciherang variety, straw compost, Phonska NPK fertilizer, PGPR, meter, and analytical balance. The treatments were arranged in a Randomized Block Design (RBD), with a single factor, namely the concentration of PGPR consisting of 5 ml/l (K1); 10 ml/l (K2); and 15 ml/l (K3). The variables observed, namely: plant height, number of productive tillers, number of pithy grain per panicle, number of empty grain per panicle, and dry grain yield per plot. The results showed that the concentration of PGPR affected the number of productive tillers, the number of pithy grains per panicle, the number of empty grains per panicle, and the dry grain yield but plant height was not affected by the concentration of PGPR. The highest harvested dry grain yield of 5.05 kg per plot or equivalent to 8.42 tons ha−1 was achieved at a PGPR concentration of 10 ml/L (K2).