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Nitrogen Mineralization of Bioslurry and Other Manures in Soil

M. Asadul Haque
Department of Soil Science, Patuakhali Science and Technology University, Patuakhali

M. Jahiruddin
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202

M. Mazibur Rahman
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202

M. Abu Saleque
Bangladesh Rice Research Institute, Gazipur, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted to examine the nitrogen (N) mineralization pattern of bioslurry and other manures under aerobic and anaerobic soil conditions. Two bioslurries (cowdung and poultry manure) and their original manures (cowdung and poultry manure) @ 3, 5, 10 and 20 t ha^-1 , respectively, were thoroughly mixed with soil and incubated in aerobic and anaerobic moisture condition for 12 weeks and available N (both NH₄ + -N and NO₃ --N) was measured by steam distillation method. NO₃ --N was the dominant form of inorganic N in aerobic soil, whereas, NH4 + -N dominated under anaerobic soil condition. When highest cu mulative total available N mineralization among the manures at 3, 5, 10 and 20 t ha ^-1 rate was considered after 12 weeks of incubation, the N mineralization was 5.0, 5.5, 6.8 and 4.3 times higher, respectively, in aerobic condition over anaerobic condition. Under aerobic condition cowdung bioslurry and poultry manure bioslurry had very closer percentage of N mineralization and was much higher compared to their original manure (cowdung and poultry manure, respectively). With the increase of the rate of manure application, total available N release was increased but percent N release was rather decreased irrespective of the types of manure and soil moisture contents. Application of bioslurries in parallel with their original manures (cowdung and poultry manure) in soils are, therefore, should be considered and recommended to increase N fertility in soil.

Keywords: Bioslurry, Cowdung, Nitrogen mineralization, Poultry manure

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

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To examine the nitrogen (N) mineralization pattern of bioslurry and other manures under aerobic and anaerobic soil conditions.

Methodology:

The incubation experiment was conducted in the Department of Soil Science, Bangladesh Agricultural University (BAU), Mymensingh. Soils were collected from the BAU farm (Old Brahmaputra Floodplain, AEZ-9) at 0-15 cm depth of a field and were thoroughly mixed. The soils were spread on brown paper for air-drying. The air-dry soils were ground and passed through a 2-mm sieve to remove roots and other debris. The soil was silt loam, with 1.14 % O.C., 6.5 pH, 1.17 % total N, 6.0 mg kg ^-1 available P, 0.12 cmol kg ^-1 exchangeable K, and 14.0 mg kg ^-1 available S. The elements were determined by standard methods as outlined. Four types of organic manure viz. cowdung, cowdung bioslurry, poultry manure and poultry manure bioslurry were used in this study. The manures were air-dried, ground and passed through a 2-mm sieve. The chemical composition of various manures is presented. An amount of 100g air-dry soil was weighed into a series of small plastic containers. Air dry finely ground partially decomposed cowdung, cowdung bioslurry, poultry manure and poultry manure bioslurry @ 1.5, 2.5, 5.0 and 10.0 g kg^-1 soil (equivalent to 3, 5, 10 and 20 t ha^-1 , respectively) were thoroughly mixed with soil in separate containers. A control container (without organic manure) was placed along with each set of incubation. Two moisture levels – one field capacity/aerobic (25% soil moisture) and another submerged/anaerobic condition (1 cm standing water above soil level) were maintained. The containers were incubated at room temperature (25 ± 2°C) for 12 weeks. All the treatment s were replicated twice. Every week soil moisture contents were monitored. The weight loss due to evaporation of moisture was replenished by adding required amount of water and was mixed with soil properly to maintain specific moisture content (field capacity and saturated condition) of the soil. Destructive sampling was done in this experiment. The first sampling and followed by measurement was done just the next day of incubation and the second measurement was done at 7 days after incubation; thereafter at 7-day intervals and after 8 weeks measurement was done at 2-week intervals. Available N content of soil was extracted (1:10 soil-extractant ratio) by 2M KCl solution. The aliquot was steam distilled with MgO and Devarda’s alloy to determine available NH₄ ⁺-N and NO₃^--N contents. The data were corrected for moisture content and reported on oven dry basis.

Source of Information: Res. Agric. Livest. Fish. Vol. 2, No. 2, August 2015: 221-228, ISSN : P-2409-0603

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Bioslurries, whether it is cowdung or poultry manure, had higher percentage of N mineralization compared to their original manure (cowdung and poultry manure, respectively). Nitrogen mineralization in aerobic condition was higher and faster compared to anaerobic condition. Bioslurries can be advised to use as manure in parallel with cowdung and poultry manure for crop production.

Knowledge Management: Journal