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Effect of Bulking Materials Over the Composting of Bio-slurry

M Al-Amin
Department of Animal Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

MM Rahman
Department of Animal Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

SMA Islam
Department of Animal Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

H Dhakal
Scientist
Department of Animal Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh; Nepal Agriculture Research Council, Nepal.

MRI Khan
Department of Animal Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

MR Amin
Department of Animal Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

AKMA Kabir
Department of Animal Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Abstract/ Executive Summary:

Bio-slurry is considered a good quality organic fertilizer in Bangladesh agriculture. An experiment was conducted at Bangladesh Agricultural University, Mymensingh to assess the effect of bulking materials over the composting of bio-slurry. The experiment was conducted with 4 treatments each of 3 replications. The treatments for compost preparation were, T0 (50% Bio-slurry + 50% manure), T1 (50% Bio-slurry + 50% manure and sawdust), T2 (50% Bio-slurry + 50% manure and rice straw), T3 (50% Bio-slurry + 50% manure and tree leaves). Compost moisture, pH, temperature, and C: N ratio was assessed every week. The maximum temperature found in T1 (34.03°C) and other treatments showed a slower rise in temperature. Highest C: N ratio (19.30) was obtained in T3. The pH of the compost was significantly influenced by sawdust which ranged from 8.28 in T2 to 8.74 in T1. The moisture content of compost was significantly influenced by bulky materials and ranged from 56.34 to 68.83. At 42 days the highest crude fiber was obtained in T2 (25.16%). The results suggest that bulky materials treated bio-slurry can be good compost which will be very effective to soil and crops.

Keywords: Bio-slurry; Composting; Agricultural waste; Bulking material

Location: Department of Animal Science, Bangladesh Agricultural University, Mymensingh.

Start Date: 00-02-2019

End Date: 00-04-2019

Program Area: Crop-Soil-Water Management

Commodity: Organic fertilizer, Bio fertilizer

Objectives:

The study was conducted with the aim of the utilization of Bio-slurry waste into valuable fertilizer by composting with different agricultural wastes as moisture absorbent.

Methodology:

The experiment was conducted at Sheep and Goat Farm of the Department of Animal Science, Bangladesh Agricultural University, Mymensingh. The composting period was 45 days i.e 12 February to 24 April 2019. The chemical analysis of Bio-slurry and composted Bio-slurry was performed in the Departmental laboratory. To fulfill the objectives, four experiments were conducted e.g. anaerobic composting T₀ (50% Bio-slurry + 50% manure), T₁ (50% Bio-slurry + 50% manure and sawdust), T₂ (50% Bio-slurry + 50% manure and rice straw), T₃ (50% Bio- slurry + 50% manure and tree leaves) under the soil surface to develop a convenient method of composting Bio-slurry. The sample was collected at 0, 7, 14, 21, 28, 35, 42^nd days for analysis. In each treatment, there were three replications to minimize the experimental errors. The Bio-slurry, rice straw, tree leaves were collected from the Goat, Sheep, and Horse Farm of Bangladesh Agricultural University. Sawdust was collected from Babul sawmill, Seshmore, BAU, Mymensingh. The raw materials were carried into sac at the Animal Science Field Laboratory and stored in air-tight condition. A place of comparatively high land at Animal Science Field Laboratory was selected to prepare holes where rainwater was not logged. At first, the place was cleaned and then 12 similar pits were prepared whose diameter was 75 cm and depth 45 cm. Polyethylene bags were set at the bottom and sidewall of pits to prevent leaching and water contamination with compost. After collection, the sample was mixed properly and divided each sample into 3 parts of 40 kg then bulking materials were mixed with the sample to fix the moisture level at 70%. No treatment was given rest of the parts. The composting materials in the composting pits were turned and mixed at every 7-day interval. The composting materials under decomposition were collected just after turning and mixing the materials and collected samples were analyzed for the following attributes: Moisture content was determined by gravimetric method. The temperature was determined by a soil thermometer (Easy-Read Thermometer). The pH of the composting materials during the composting process was determined by the Glass Electrode pH meter. The total nitrogen was determined by Micro- Kjeldhal method as outlined by Jackson (1962) through the digester of organic matter. Total organic carbon was divided by total nitrogen. Data collected on different parameters under this study were statistically analyzed to ascertain the significant differences between treatments. The distribution of data for normality was checked before data analysis. All data were normally distributed. The data were analyzed in a Completely Randomized Design.

Source of Information: Bang. J. Anim. Sci. 2020. 49 (2): 142-150

Article Link (Online Journal): DOI: https://doi.org/10.3329/bjas.v49i2.53224

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Bio-slurry using bulky materials as an accelerant leads to rapid decomposition and attaining stability of compost. During the composting process, bulky materials decomposed organic compounds, which consist of carbohydrates, sugar, proteins, fats, cellulose, and lignin. Several physical and chemical changes occurred during the process of decomposition. As the composting proceeded, moisture content was gradually decreased. The results revealed that there was a sharp change C/N ratio fall down. C/N ratio is one of the most important parameters used for determining compost maturity. Bio-slurry composting by using tree leaves as a composting accelerator had the highest C/N ratio (19.87) which is not acceptable for safe use in crop production. The lowest moisture was observed in T₁ (56.34%). From the result, it may be concluded that bulky materials treated compost is more effective compared to only Bio-slurry compost.

Knowledge Management: Journal