Integration of phosphate solubilizing bacteria and ponska fertilizer as a soybean fertilization method that is adaptive to climate change

Climate change, such as altering rainfall patterns and increasing the risk of extreme droughts cause degradation of soil chemical properties, deficiency of soil nutrients and reduction of plant growths and productions. Therefore, an alternative strategy is necessary to overcome those issues. A method of appropriate fertilization was likely to be applied to conserve soil fertility and maintain sustainable plant growth which might benefit facing the issues. This study examined the integration fertilization between phosphate solubilizing bacteria (PSB) and PONSKA fertilizer on changes in soil chemical properties and plant growth under greenhouse conditions. The trial pot were applied using a completely factorial randomized design of two factors with three replication for each combined treatment. The first factor was PSB inoculation with three levels (B0=0. B1= 5 and B2 = 10 ml. plant-1) and the second one was PONSKA fertilizer application with three doses ( P1=100. P2=150. P3= 200 kg. ha-1). The results showed that neither the interaction treatments nor each factor significantly affect the soil pH-H2O and the total content of N and organic C. Each factor of PSB and PONSKA fertilizer, respectively, significantly affected available P content. A PSB level of 10 ml. plant-1 indicated the highest P content (15.5 ppm), while the PONSKA doses of 150 and 200 kg. ha-1 insignificantly affected but the availability of P content was higher that of P1 parameter. Even though, the single factor of PSB and PONSKA fertilizer significantly affected the shoot of dry weight, the level of roots, and the number of active root nodules, they were insignificantly affected the shoot/root ratio. Treatment of B1 and B2 showed an insignificant difference in the dry weight of roots (1.61 g plant-1) and active root nodules (55.23-62.31) but desired effects of those treatments were higher than that of B0 parameter. The treatment B2 yielded the highest dry weight of shoots. Moreover, the composite of PONSKA fertilizer and PONSKA dose of 150 (P1) and 200 kg ha-1 (P2) yielded the shoot dry weight, root dry weight and number of active root nodules higher than the P1 parameter. A combination of P2 and B1 results in 22.97 g. plant-1 of seed bean. Therefore, a PONSKA dose of 150 kg. ha-1 added by a PSB of 5 ml.plant-1 was likely to be an alternative fertilization method to cope the issues of climate change.