M. M. MASUD
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh
R. SEN
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh
S. AKHTER
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh
M. G. RAHMAN
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh
M. R. AHMAD
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh
Poultry litrer, Biochar, Soil ferrility, Soil acidity
Soil Science Division Lab., BARI, Joydebpur
Crop-Soil-Water Management
Organic fertilizer, Maize
Site and Soil description: The acidic soil used in this study was collected from a cropland of Khagrachori area. The sample was taken from the topsoil (0-10 cm), air-dried and ground to pass a 2-mm sieve. The soil pH was 5.45 as determined in a 1:2.5 soil to water suspension. The soil organic carbon was 0.93% and soil available Ca, Mg and K, were 4.4, 1.5, 1.6 meq 100g−1 soil, respectively. Available P and S were 2.7 and 10.1 mg kg−1. Metal ions were 1.9, 21, 4.6, 1.88 mg kg-1 for Cu, Fe, Mn, Zn, respectively. Biochar preparation and analysis: The poultry litter was collected from suburb of Gazipur rgion. Poultry litter was air-dried at room temperature and make small pieces then placed in biochar making device and pyrolyzed under oxygen-limited conditions. The pyrolysis temperature was raised to the selected value of 700°C at a rate of approximately 20°C per minute and held constant for 2 h, then the biochar was allowed to cool to room temperature and ground to pass a 0.25 mm sieve. All biochar samples were examined to determine their main characteristics without further treatment, and their characteristics are shown in Table 1. After being thoroughly mixed with deionized water at a ratio of 1:20 and equilibrated for 1 h, the pH of the biochars was measured by Metler Toledo S220 with a combination electrode. The CEC of the soil samples was measured by ammonium acetate compulsory displacement method, exchangeable base cations were extracted with 1.0 M ammonium acetate (pH 7.0), Ca2+ and Mg2+ were measured with AAS, and K+ and Na+ with flame photometry. The phosphorus was determined colorimetrically after digesting the biochars with sulphuric acid and hydrogen peroxide. Fertilizer and Treatments: The experiment was laid out in a randomized complete block design with three replication. The unit plot size 3m × 2m and maintaining spacing 60 cm × 25 cm. “BARI Sweet Corn-1” maize seeds were placed into experimental field on January, 2018. The experiment consisted of six treatments, viz., T1 = RDCF + Poultry litter biochar 5 t ha-1, T2 = RDCF + Poultry litter biochar 10 t ha-1, T3 = RDCF + Poultry litter biochar 15 t ha-1, T4 = RDCF + Agricultural lime 1 ha-1, T5 = RDCF. Recommended dose of fertilizer for the crop was N255 K50 K120 S40 Zn5 B2 kg ha-1. Urea, TSP, MP, Gypsum and Boric acid were used as a source of N, P, K, S and B, respectively. All P, K, S, B and Boichar, and 1/3 N were applied at the time of final land preparation and the remaining 2/3 N was applied in two equal installments at 25 and 45 days after transplanting. All the intercultural operations such as irrigation, weeding, insect control etc were done as and when necessary. Harvesting of maize was done when the cob became mature and turned reddish colour. Soil Sampling and Analysis: Soil samples were taken from the topsoil with 0 cm-15 cm depth on 15 March 2018, after about three months following biochar addition. The soil samples were dried at room temperature and ground to less than 1 mm. Soil pH was measured in 1:2.5 soil/DI water. The CEC of the soil samples was measured by ammonium acetate compulsory displacement method, exchangeable base cations were extracted with 1.0 M ammonium acetate (pH 7.0), Ca2+ and Mg2+ were measured with AAS, and K+ and Na+ with flame photometry. Carbon stock and C sequestration will be calculated using the following equation 1 and 2, respectively. Carbon stock (t ha-1) = Carbon concentration (%) x bulk density (g cm-3) x depth (cm) ….. (1); and Carbon accumulation (t ha-1) = Final C stock (t ha-1) – Initial C stock (t ha-1) …………….. (2). Statistical analyses: Software package, statistix 10 (Analytical Software) was used for the statistical analysis of data. A one-way analysis of variance was undertaken for each time interval of the incubations to determine significant differences among treatments. The significant effects for various treatments were detected using t test.
Annual Report 2018-2019, BARI, Gazipur, Bangladesh
Report/Proceedings