PJB-2024-231
Phosphorus mobilizing Bacillus with compost enhance growth, yield and phosphorus nutrition of wheat
ZAHRA BATOOL
Abstract
Phosphorus solubilizing bacteria (PSB) play an important role in improving phosphorus nutrition by increasing its availability to plants through slowly release from organic and inorganic soil phosphorus budget by solubilization and mineralization. PSB in combination with compost, and phosphorus has potential to improve phosphorus uptake, growth and development of the plants. Eight strains of PSB were used for 21 days screening trial to select the efficient strains in laboratory. Strains PSB2 and PSB5 showed potential to improve seedling growth of wheat and selected for field evaluation. Field experiment was performed in a randomized complete block design (RCBD) under split-split settings. The inoculation treatments were as T1=No inoculation; T2=Bacillus sp. PSB2, T3=Bacillus sp. PSB5, T4=Bacillus spp. PSB2+PSB5, which were compared on plots as CM0= without compost and CM1= with compost (300 kg ha-1) and phosphorus levels; P100=recommended dose of phosphorus (120 kg ha-1) and P75= 75% of recommended dose of phosphorus (90 kg ha-1) using wheat as a test crop. Result showed significance of combined application of strains (PSB2 + PSB5) and compost (300 kg ha-1), at 100% phosphorus level (120 kg ha-1) [stomatal conductance (8.66%), net photosynthetic rate (10.23%), chlorophyll contents (40.29%), plant height (37.42%), dry biomass (23.2%), thousand-grain weight (44%), grain yield (37%), nitrogen (37.9%), phosphorus (35.1%) and potassium (38.8%)] followed by strains (PSB2 + PSB5) and compost (300 kg ha-1), at 75% phosphorus level (90 kg ha-1) [plant height (36%), dry biomass (22%), thousand-grain weight (38%), grain yield (36%), nitrogen (35.9%), phosphorus (34.2%) and potassium (34.3%)] over control (without inoculation and compost). Overall, results suggest that the combined application of efficient phosphorus bacterial strains (PSB2 + PSB5) in combination with compost (300 kg ha-1), and phosphorus (120 kg ha-1) or phosphorus (90 kg ha-1) is a pragmatic option to improve wheat productivity and profitability.
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