Insight to key diazotrophic community during composting of dairy manure with biochar and its role in nitrogen transformation

Abstract. Nitrogen isotope ratios (δ15N) of NH4+ in dairy manure compost piles with and without bulking agent (10 % w∕w) were compared to understand the effects of the use of bulking agent on nitrogen conversion during manure composting. The δ15N–NH4+ values in each of three pile zones (top, side and core) were also compared. At the end of the process, piles with bulking agent showed significantly higher δ15N values (17.7 ± 1.3 ‰) than piles without bulking agent (11.8 ± 0.9 ‰), reflecting the significantly higher nitrogen conversion and NH3 loss in the former. The samples from the top zone, especially in the piles with bulking agent, showed very high NH4+ concentrations with significantly high 15N (δ15N: 12.7–29.8 ‰) values, indicating that extremely high nitrogen conversion, nitrification–denitrification activity of the microbes and NH3 volatilization occurred in this zone.

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Evidence of Diazotrophic Community Structure in Cotton Agroecosystem

Indian Journal Of Applied Research ◽

10.15373/2249555x/feb2014/145 ◽

2011 ◽

Vol 4 (2) ◽

pp. 3-6

Author(s):

Sandhya Rai ◽

◽

Dileep Kumar Singh ◽

Kannepalli Annapurna

Keyword(s):

Community Structure ◽

Diazotrophic Community

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Orientation of processes of biological nitrogen transformation in winter rye agroecosystems under different levels of fertilization background

Agricultural science and practice ◽

10.15407/agrisp3.03.028 ◽

2016 ◽

Vol 3 (3) ◽

pp. 28-34

Author(s):

V. Volkogon ◽

I. Korotka

Keyword(s):

Root Zone ◽

Field Studies ◽

Nitrogen Transformation ◽

Mineral Nitrogen ◽

Nitrogen Fertilizers ◽

Winter Rye ◽

Podzolic Soils ◽

Microbial Preparation ◽

Biological Nitrogen

Aim. To determine physiologically expedient rates of mineral nitrogen in winter rye production on sod-podzol- ic soils based on the orientation of the processes of biological nitrogen transformation in the plants rhizosphere. Methods. Field studies, gas chromatography determination of potential nitrogen fi xation activity and potential emissions of N 2 O. Results. The results obtained have demonstrated that the rates of mineral nitrogen, not ex- ceeding 60 kg/ha, can be considered physiologically expedient for winter rye production on sod-podzolic soils. Under the application of microbial preparation Diazobakteryn, there is a higher physiological need of plants for nitrogen, which allows increasing the rates of nitrogen fertilizers up to 90 kg/ha. Conclusions. The orienta- tion of the processes of biological nitrogen transformation in the root zone of plants is a reliable indicator of determining the appropriateness of nitrogen fertilization of crops.

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