Microbial biomass dynamics and phosphorus availability in soil amended with compost, farmyard manure and sugarcane filter cake
Paper Details
Microbial biomass dynamics and phosphorus availability in soil amended with compost, farmyard manure and sugarcane filter cake
Abstract
Addition of organic amendments to agricultural soils has the potential to increase crop yields, reduce dependence on inorganic fertilizers and improve soil condition and resilience. A 90-days incubation experiment was conducted to check the effects of three organic sources i.e. compost, farmyard manure (FYM) and sugarcane filter cake (SFC), each applied at the rate of 0.5mg Cg-1 soil on microbial biomass, enzymatic activity, CO2 evolution and phosphorus availability in soil. The incubation was carried out at 25oC and 50% water holding capacity WHC. Soil samples were collected at day 0, 30, 60 and 90 days of incubation and analyzed for the above parameters. Results showed that all the three organic amendments had a significant increase in soil microbial and biochemical parameters, highest response was recorded in sugarcane filter cake followed by farmyard manure and compost amendment.CO2 evolution was also higher in the soils amended with organic sources compared to the un-amended soil. Microbial parameters increased initially up to 30 days of incubation and thereafter decreased indicating microbial biomass turnover. Microbial biomass P was highest (17.63µg g-1) at day 30 under P-enriched sugarcane filter cake. It is concluded that use of organic amendments enhanced phosphorus bioavailability through activation of soil enzymes and microbial biomass.
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