PJB-2017-146
PHOSPHORUS SOLUBILIZING BACTERIA AND GROWTH AND PRODUCTIVITY OF MUNG BEAN (VIGNA RADIATA)
W. HASSAN, S. BASHIR, S. HANIF, A. SHER, A. SATTAR, A. WASAYA, H. ATIF AND M. HUSSAIN
Abstract
Phosphorous solubilizing bacteria (PSB) are known as beneficial bacteria that enhance the growth of the plants, when applied to the crops. An experiment was conducted to study the effect of two PSB spp. i.e., Pseudomonas striata and Bacillus polymyxa on the growth and development of mung bean. Seeds of mung bean i.e. 4 seeds per pot having 500 g loamy soil/pot were inoculated with broth of selected isolates and sown. Nutrition was provided through Hoagland nutrient solution. For control, sterilized flasks having 0.03 M MgSO4 solution were used to dip the seeds. After forty days, mung bean plants were harvested and important growth parameters were recorded. Results revealed that inoculation with PSB, increased plant height (11.88-30.69%), branchs/plant (18.35-39.20%), leaves/plant (12.10-41.30%), pods/plant (26.84-57.54%), seeds/plant (6.901-23.43%), pod length (13.00-38.02%) and 1000seed weight (10.07-35.83%), number of effective nodules (7.0-18.0%), nodule density (12.0-21.0%), chlorophyll a and b (5.4-11.4% and 6.6-12.8%), carotenoids (11.4-43.5%), protein (0.05-0.15%) and proline (0.09-0.321%), respectively as compared to un-inoculated control. Moreover, PSB also enhanced the availability of P and N up to 13.56% and 8.56% respectively in soil and uptake of macronutrients i.e., N (0.35-1.21% and 0.51-1.56%), P (0.18-0.65% and 0.26-0.77%), K (1.01-2.89% and 1.21-3.11%), Ca (0.19-0.74% and 0.23-0.88%) and Mg (0.15-0.61 and 0.19-0.78%) in root and shoot of plant compared to control. Further PSB enhanced the soil microbial biomass i.e. MBC (35.4-48.6%), MBN (19.6-35.3%) and MBP (8.41-18.2%), and decreased the non-effective nodules ranging from 5.5-3.0%. The PSB had a convincingly positive impact on the growth, development and productivity of the mung bean and fruit quality, and P and N availability in the soil, and macronutrients uptake in plant without polluting the environment. Therefore, PSB can be used as an alternative and eco-friendly approach for sustainable crop production.
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