Phosphate solubilizers enhance NPK fertilizer use efficiency in rice and legume cultivation

Abstract

It has been reported that phosphate solubilizing bacteria (PSB) are the most promising bacteria among the plant growth promoting rhizobacteria (PGPR); which may be used as biofertilizers for plant growth and nutrient use efficiency. Moreover, these soil micro-organisms play a significant role in regulating the dynamics of organic matter decomposition and the availability of plant nutrients such as nitrogen (N), phosphorus (P), potassium (K) and other nutrients. Through this study, the management of nutrient use efficiency by the application of PSB was targeted in order to make the applied nutrients more available to the plants in the rice (Oryza sativa) and yardlong bean (Vigna unguiculata) cultivation. Results have shown that the treatments with PSB alone or in the form of consortia of compatible strains with or without the external application of chemical NPK gave more germination index (G. I.) from 2.5 to 5 in rice and 2.7 to 4.8 in bean seeds. They also showed a higher growth in both shoot and root length and a higher biomass as compared to the control. This gives us an idea about the potentiality of these PSB strains and their application in rice and yardlong bean cultivation to get a better harvest index. Their use will also possibly reduce the nutrient runoff or leaching and increase in the use efficiency of the applied fertilizers. Thus, we can conclude that the NPK uptake and management can be improved by the use of PSB in rice and yardlong bean cultivation, and their application may be much more beneficial in the agricultural field.

Impact of Phosphorus Levels and PSB Strains on Soil Microbial and Enzymatic Activities under Acidic Soils of North East India

“…It may be stated that the increase in phosphatase activity in PSB-treated soil is an indication of the increased soil fertility and improvement in the phosphate solubilization. The increase in DHA might be due to application of phosphorus increases the microbial population in rhizosphere of plant and PSB inoculation increased as compared to control treatment Duarah et al, (2011). The dehydrogenase activity of soil in case of both rice and bean cultivation was found to be decreased with the amendment of NPK fertilizer.…”

“…In contrast to this, a significant increase of dehydrogenase activity (p ≤ 0.05) was found in PSB treated (without NPK treatment) soil over the control. Dehydrogenase activity is commonly used as an indicator for biological activity, i.e., it can be used to indicate the total microbial population Duarah et al, (2011). However, the decrease in dehydrogenase activity may also be contributed by the fact that indicator TTC (triphenyltetrazolium chloride) yield less formazan for the interference by the NPK with the electron donors Casida (1977).…”

Effect of different fertilizing and farming systems in annual medic (Medicago scutellata ’Robinson’) on soil organic matter and nutrients status

“…Our results was supported by other literature reports on the synergistic effects of integrated application of chemical, organic and biological fertilizers on crop yields (Patidar and Mali, 2001;Hariprasad and Niranjana, 2009;Kim et al 2009). Accordingly the findings of Duarah et al (2011) indicated that the application of biofertilizers (phosphorus solubilize bacteria) can significantly increase the plant biomass compare to application of NPK. Integrated fertilizing systems not only reduces the environmental pollution through reduction in chemical fertilizer consumption, but also improves forage quality features.…”

“…With biological fertilizers utilization, it can be postulated that the nitrogen availability for plants will increase providing the suitable growth conditions and so a better quality yields will be expected (Duarah et al, 2011). Combining the biological fertilizer with urea under a suitable irrigation conditions can lead to increased forage quality.…”

Bioremediation of Petroleum hydrocarbon by using Pseudomonas species isolated from Petroleum contaminated soil

“…Bioremediation is an option that offers the possibility to destroy or render harmless various contaminants like pesticides, hydrocarbons and heavy metals using natural biological activity. [6][7][8][9][10][11][12][13] So keeping in view the above constrains, the present study was designed to screen certain bacterial isolates from diesel contaminated sites, belonging to decomposition of hydrocarbons. Current study was divided into three main parts; (1) collection of different industrial soils.…”