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[Effects of the Combined Application of Organic and Inorganic fertilizers on N 2 O Emissions from Saline Soil].
- Source :
-
Huan jing ke xue= Huanjing kexue [Huan Jing Ke Xue] 2020 Aug 08; Vol. 41 (8), pp. 3811-3821. - Publication Year :
- 2020
-
Abstract
- Combining organic fertilizer with chemical fertilizer may affect the microbial processes related to nitrous oxide (N <subscript>2</subscript> O) emissions under different degrees of soil salinization. A mild saline soil (S <subscript>1</subscript> ; electrical conductivity (EC) 0.46 dS·m <superscript>-1</superscript> ) and moderate saline soil (S <subscript>2</subscript> ; EC 1.07 dS·m <superscript>-1</superscript> ) in the Hetao irrigation district of Inner Mongolia were selected. Under equal N rates, the study involved five treatments:U <subscript>1</subscript> (240 kg·hm <superscript>-2</superscript> of chemical fertilizer), U <subscript>3</subscript> O <subscript>1</subscript> (180 kg·hm <superscript>-2</superscript> of chemical fertilizer+60 kg·hm <superscript>-2</superscript> of organic fertilizer), U <subscript>1</subscript> O <subscript>1</subscript> (120 kg·hm <superscript>-2</superscript> of chemical fertilizer+120 kg·hm <superscript>-2</superscript> of organic fertilizer), U <subscript>1</subscript> O <subscript>3</subscript> (60 kg·hm <superscript>-2</superscript> of chemical fertilizer+180 kg·hm <superscript>-2</superscript> of organic fertilizer), and O <subscript>1</subscript> (240 kg·hm <superscript>-2</superscript> of organic fertilizer). In addition, a blank control treatment (CK) was employed to investigate the effects of different fertilization treatments on the N <subscript>2</subscript> O emissions from the two saline soils. The results showed that the total N <subscript>2</subscript> O emissions from the S <subscript>2</subscript> soil in the same treatment were between 11.86% and 47.23% higher than those from the S <subscript>1</subscript> soil ( P <0.05). the dynamic trend of the soil N <subscript>2</subscript> O fluxes among the different treatments were similar. The peak N <subscript>2</subscript> O emissions occurred after fertilization, and the N <subscript>2</subscript> O cumulative emission fluxes accounted for nearly 60% of the emissions during the entire growth period. The proper application of organic fertilizer could significantly reduce the soil N <subscript>2</subscript> O emission; the S <subscript>1</subscript> and S <subscript>2</subscript> saline soils treated with U <subscript>1</subscript> O <subscript>1</subscript> and O <subscript>1</subscript> , respectively, had the lowest N <subscript>2</subscript> O emissions, whereby there were significant reductions of 33.62% and 28.51% in comparison to the U <subscript>1</subscript> treatment ( P <0.05). Moreover, higher maize yields could be obtained and the N <subscript>2</subscript> O flux was significantly positively correlated with the NH <subscript>4</subscript> <superscript>+</superscript> -N content ( P <0.01) but negatively correlated with the NO <subscript>3</subscript> <superscript>-</superscript> -N content. The results demonstrated that nitrification was the main way to produce N <subscript>2</subscript> O in the studied salinized maize farmland, and that the addition of organic fertilizer could reduce the N <subscript>2</subscript> O production by decreasing the soil NH <subscript>4</subscript> <superscript>+</superscript> -N content. Based on the changes in the corn yield and a reduction in the greenhouse effect, suitable organic and inorganic fertilizer management models for the Hetao irrigation area were the mild saline soil:120 kg·hm <superscript>-2</superscript> of urea +120 kg·hm <superscript>-2</superscript> of organic fertilizer), and the moderate saline soil:240 kg·hm <superscript>-2</superscript> of organic fertilizer.
- Subjects :
- Agriculture
China
Nitrogen
Nitrous Oxide analysis
Fertilizers analysis
Soil
Subjects
Details
- Language :
- Chinese
- ISSN :
- 0250-3301
- Volume :
- 41
- Issue :
- 8
- Database :
- MEDLINE
- Journal :
- Huan jing ke xue= Huanjing kexue
- Publication Type :
- Academic Journal
- Accession number :
- 33124358
- Full Text :
- https://doi.org/10.13227/j.hjkx.202002046