The Transformation Dynamics and Homogeneity of Different N Fractions in Compost following Glucose Addition
The application of compost to soil is a common fertilization practice for improving soil quality and crop growth. The isotopic labeling technique is mostly used to investigate the contribution of compost N to crop uptake. However, compost N includes various N fractions and labeling dissimilarity, wh...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-10-01
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| Series: | Agriculture |
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| Online Access: | https://www.mdpi.com/2077-0472/11/10/971 |
| _version_ | 1797515620357505024 |
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| author | Caibin Li Shuai Ding Chenghang Du Yi He Zemeng Ma Guitong Li Zhencai Sun |
| author_facet | Caibin Li Shuai Ding Chenghang Du Yi He Zemeng Ma Guitong Li Zhencai Sun |
| author_sort | Caibin Li |
| collection | DOAJ |
| description | The application of compost to soil is a common fertilization practice for improving soil quality and crop growth. The isotopic labeling technique is mostly used to investigate the contribution of compost N to crop uptake. However, compost N includes various N fractions and labeling dissimilarity, which may cause bias when calculating the compost N contribution to plants. Therefore, the labeling dynamics of different N fractions in compost and the homogenous labeling time point should be clarified. Given the <sup>15</sup>N-labeling in chemical fertilizer and the carbon source, i.e., glucose, the compost N pools were divided into active N (mineral N, soluble organic N [SON], microbial biomass N [MBN]), stable N (hot-water extractable organic N [HWDON]), and recalcitrant N. The atom percentage excess (APE) of different N in compost notably varied at the beginning of incubation, ranging from 0–3.7%. After the addition of glucose, biological N immobilization was promoted (13.7% and 28.8% for MBN and HWDON, respectively) and promoted the transformation among available N pools. Adding distinct doses of glucose at three stages to <sup>15</sup>N-labeled compost resulted in diverse microbial responses, thereby redistributing exogenous N in each fraction (<sup>15</sup>NH<sub>4</sub><sup>+</sup>-N went into SO<sup>15</sup>N from day 15 to day 30 and increased by 5.1%; SO<sup>15</sup>N entered MB<sup>15</sup>N and HWDO<sup>15</sup>N during day 30 to day 45 and increased by 5.7% and 5.2%, respectively). On day 45, homogeneous <sup>15</sup>N-labeled compost was achieved, which was 2.4% for <sup>15</sup>N APE for all N fractions. Overall, the quantitative data for the transformation of N fractions in compost at distinct stages provides a scientific basis for compost labeling trials, in order to identify the time point at which compost N-labeling is homogeneous, which is necessary and meaningful to reduce the bias of the contribution rate of compost-N to plants. |
| first_indexed | 2024-03-10T06:48:04Z |
| format | Article |
| id | doaj.art-4715f761cf4f47cd87b113dad4decbf3 |
| institution | Directory Open Access Journal |
| issn | 2077-0472 |
| language | English |
| last_indexed | 2024-03-10T06:48:04Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Agriculture |
| spelling | doaj.art-4715f761cf4f47cd87b113dad4decbf32023-11-22T17:05:05ZengMDPI AGAgriculture2077-04722021-10-01111097110.3390/agriculture11100971The Transformation Dynamics and Homogeneity of Different N Fractions in Compost following Glucose AdditionCaibin Li0Shuai Ding1Chenghang Du2Yi He3Zemeng Ma4Guitong Li5Zhencai Sun6Bijie Tobacco Company of Guizhou Province, Guizhou 551700, ChinaCollege of Land Science and Technology, China Agricultural University, Beijing 100193, ChinaCollege of Agronomy, China Agricultural University, Beijing 100193, ChinaBijie Tobacco Company of Guizhou Province, Guizhou 551700, ChinaCollege of Land Science and Technology, China Agricultural University, Beijing 100193, ChinaCollege of Land Science and Technology, China Agricultural University, Beijing 100193, ChinaCollege of Agronomy, China Agricultural University, Beijing 100193, ChinaThe application of compost to soil is a common fertilization practice for improving soil quality and crop growth. The isotopic labeling technique is mostly used to investigate the contribution of compost N to crop uptake. However, compost N includes various N fractions and labeling dissimilarity, which may cause bias when calculating the compost N contribution to plants. Therefore, the labeling dynamics of different N fractions in compost and the homogenous labeling time point should be clarified. Given the <sup>15</sup>N-labeling in chemical fertilizer and the carbon source, i.e., glucose, the compost N pools were divided into active N (mineral N, soluble organic N [SON], microbial biomass N [MBN]), stable N (hot-water extractable organic N [HWDON]), and recalcitrant N. The atom percentage excess (APE) of different N in compost notably varied at the beginning of incubation, ranging from 0–3.7%. After the addition of glucose, biological N immobilization was promoted (13.7% and 28.8% for MBN and HWDON, respectively) and promoted the transformation among available N pools. Adding distinct doses of glucose at three stages to <sup>15</sup>N-labeled compost resulted in diverse microbial responses, thereby redistributing exogenous N in each fraction (<sup>15</sup>NH<sub>4</sub><sup>+</sup>-N went into SO<sup>15</sup>N from day 15 to day 30 and increased by 5.1%; SO<sup>15</sup>N entered MB<sup>15</sup>N and HWDO<sup>15</sup>N during day 30 to day 45 and increased by 5.7% and 5.2%, respectively). On day 45, homogeneous <sup>15</sup>N-labeled compost was achieved, which was 2.4% for <sup>15</sup>N APE for all N fractions. Overall, the quantitative data for the transformation of N fractions in compost at distinct stages provides a scientific basis for compost labeling trials, in order to identify the time point at which compost N-labeling is homogeneous, which is necessary and meaningful to reduce the bias of the contribution rate of compost-N to plants.https://www.mdpi.com/2077-0472/11/10/971glucose additionnitrogen fractions<sup>15</sup>N-labeled compostcompost management |
| spellingShingle | Caibin Li Shuai Ding Chenghang Du Yi He Zemeng Ma Guitong Li Zhencai Sun The Transformation Dynamics and Homogeneity of Different N Fractions in Compost following Glucose Addition Agriculture glucose addition nitrogen fractions <sup>15</sup>N-labeled compost compost management |
| title | The Transformation Dynamics and Homogeneity of Different N Fractions in Compost following Glucose Addition |
| title_full | The Transformation Dynamics and Homogeneity of Different N Fractions in Compost following Glucose Addition |
| title_fullStr | The Transformation Dynamics and Homogeneity of Different N Fractions in Compost following Glucose Addition |
| title_full_unstemmed | The Transformation Dynamics and Homogeneity of Different N Fractions in Compost following Glucose Addition |
| title_short | The Transformation Dynamics and Homogeneity of Different N Fractions in Compost following Glucose Addition |
| title_sort | transformation dynamics and homogeneity of different n fractions in compost following glucose addition |
| topic | glucose addition nitrogen fractions <sup>15</sup>N-labeled compost compost management |
| url | https://www.mdpi.com/2077-0472/11/10/971 |
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