PJB-2018-775
Influence of phosphatic fertilizer on growth, yield and bacterial abundance in rice (Oryza sativa L.) genotypes
Qurban Ali Panhwar, Amanat Ali, Nizamuddin Depar and Muhammad Yousuf Memon
Abstract
Rice is one of the most important cereal crops in the world and has high nutritional food value. A field study was laid to assess the effect of phosphatic fertilizer on microbial root colonization and yield of different rice genotypes. The soil of field experiment was moderately saline, low in OM and nitrogen, and inadequate in phosphorus. Three rice genotypes MR219-9, Shandar and DR-92 were transplanted at three different rates of phosphate (30, 60 and 90 kg P2O5 ha-1). The experiment was conducted in split plot design with three replications. The abundance of general bacteria, nitrogen fixing and phosphate solubilizing bacteria (PSB) was assessed in rhizosphere of rice plants. The maximum general bacterial abundance (7.54 log cfu g-1 soil) and PSB abundance (6.97 log cfu g-1 soil) was recorded in soil under plants of Shandar genotype while the most N2 fixing bacterial abundance (6.26 log cfu g-1 soil) prevailed in soil under rice genotype MR219-9 at 30 kg P2O5 ha-1. Among rice genotypes, Shandar showed excellent enhancement in growth and yield at the 90 kg P2O5 ha-1. The maximum plant height (87.26 cm), root length (9.25 cm), number of tillers per plant (16.60 plant-1), number of panicles per plant (15.76), panicle length (25.20 cm) and 1000 grain weight (22.16 g) were observed in Shandar genotype at 90 kg P2O5. The highest grain (5.53 t ha-1) and straw yield (12.23 t ha-1) was also recorded in Shandar at 90 kg P2O5. The abundant microbial population prevailed in rhizosphere of all rice genotypes at low levels of phosphatic fertilizer application. However, the microbial populations varied among rice genotypes at different P levels that indicated the root colonization of rice that may enhance rice growth and productivity with low input of chemical fertilizers
To Cite this article:
Panhwar, Q.A., A. Ali, N. Depar and M.Y. Memon. 2021. Influence of phosphatic fertilizer on growth, yield and bacterial abundance in rice (Oryza sativa L.) genotypes. Pak. J. Bot., 53(1): DOI: http://dx.doi.org/10.30848/PJB2021-1(3)
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