Comparison of chemical properties of rice husks Biochar, Bio-slurry and piggery manure to determine quality organic waste
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This study was conducted to compare the chemical properties of rice husks biochar, cattle manure bio-slurry and pig manure to determine quality manure. The wastes were collected from Uganda Nile Breweries in Port Bell Luzira. Prior to establishment of the experiment, in November 2020 rice husks waste were burnt under anaerobic conditions at temperatures higher than 3500C to obtain the rice husks biochar, this biochar was left to cool and a 1/4kg was weighed into 10 white pills (10 replicates) labelled (C1-10). Cattle manure was used as a source of organic residue for biogas production. The end products after production of biogas; bio-slurry (liquid) was then collected into 10 of 300ml container labelled (BC1-10). Pig manure was also collected from pig housing and dried under the sun and 1/4kg was also weighed into 10 white pills (10 replicates) and the white pills were labelled (SOPM1-10). These averaged a total of 30 replicates in three different treatments each containing 10 replicates. These samples were each collected into green large pills and transported to Makerere soil, plant and Animal laboratory for experimentation in a complete randomized design to determine pH, electrical conductivity, total (nitrogen, phosphorus and potassium), sodium, calcium, organic carbon, organic matter and moisture content. The data was subjected to ANOVA using Genstat Statistical Package 14th Edition. There was a strongly significant (P<0.001) effect of treatment of organic wastes on all the chemical parameters investigated in this study. The pH was highest (9.1±0.06) in rice husks biochar whereas the lowest (7.2±0.06) was from bio-slurry. For electrical conductivity mean, the highest (5.43±0.02 mS/cm) was under bio-slurry whereas the lowest (0.54±0.21 mS/cm) was from rice husks biochar. In nitrogen, the mean was highest (2.58±0.09%) under pig manure whereas the lowest (0%) was from bio-slurry. Phosphorus mean was highest (6.08±0.16%) under pig manure whereas the lowest (0.07±0.002%) was under bio-slurry. The mean of potassium was highest (1.64±0.05%) under pig manure whereas the lowest (0.1±0.01%) was from bio-slurry. For calcium, the mean was highest (4.41±0.16%) under pig manure whereas the lowest (0.13±0.01%) was from bio-slurry. For sodium, the mean was highest (0.21±0.01%) under pig manure whereas the lowest (0.01±0.0002%) was from bio-slurry.The mean organic carbon for the treatments ranged from 19.82% (for pig manure) to 51.01% (for rice husks biochar). The organic matter ranged from 34.16% (for pig manure) to 87.95% (for rice husks biochar). The range of means of moisture content was from 29.53% (for pig manure) to 44.25% (for rice husks biochar).