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Multi-Seasonal Nitrogen Recoveries from Crop Residue in Soil and Crop in a Temperate Agro-Ecosystem.

Hu G, Liu X, He H, Zhang W, Xie H, Wu Y, Cui J, Sun C, Zhang X - PLoS ONE (2015)

Bottom Line: On average, 8.4% of the maize residue N was recovered in the soil-crop in the 1st year, and the vast majority (61.9%-91.9%) was recovered during subsequent years.Compared to the single application, the sequential residue application significantly increased the recovery of the residue N in the soil profile (73.8% vs. 40.9%) and remarkably decreased the total and the initially applied residue derived mineral N along the soil profile.Sequential residue application significantly enhanced the retention and stabilization of the initially applied residue N in the soil and retarded its translocation along the soil profile.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110164, China; University of Chinese Academy of Sciences, Beijing, 100049, China.

ABSTRACT
In conservation tillage systems, at least 30% of the soil surface was covered by crop residues which generally contain significant amounts of nitrogen (N). However, little is known about the multi-seasonal recoveries of the N derived from these crop residues in soil-crop systems, notably in northeastern China. In a temperate agro-ecosystem, 15N-labeled maize residue was applied to field surfaces in the 1st year (2009). From the 2nd to 4th year (2010-2012), one treatment halted the application of maize residue, whereas the soil in the second treatment was re-applied with unlabeled maize residue. Crop and soil samples were collected after each harvest, and their 15N enrichments were determined on an isotope ratio mass spectrometer to trace the allocation of N derived from the initially applied maize residue in the soil-crop systems. On average, 8.4% of the maize residue N was recovered in the soil-crop in the 1st year, and the vast majority (61.9%-91.9%) was recovered during subsequent years. Throughout the experiment, the cumulative recovery of the residue N in the crop increased gradually (18.2%-20.9%), but most of the residue N was retained in the soil, notably in the 0-10 cm soil layer. Compared to the single application, the sequential residue application significantly increased the recovery of the residue N in the soil profile (73.8% vs. 40.9%) and remarkably decreased the total and the initially applied residue derived mineral N along the soil profile. Our results suggested that the residue N was actively involved in N cycling, and its release and recovery in crop and soil profile were controlled by the decomposition process. Sequential residue application significantly enhanced the retention and stabilization of the initially applied residue N in the soil and retarded its translocation along the soil profile.

No MeSH data available.


Changes in soil total N content for four soil layers (0–10, 10–20, 20–40, and 40–60 cm) under different treatments during 2009 to 2012.Error bars mean standard deviations, n = 3.
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pone.0133437.g002: Changes in soil total N content for four soil layers (0–10, 10–20, 20–40, and 40–60 cm) under different treatments during 2009 to 2012.Error bars mean standard deviations, n = 3.

Mentions: For the T1 treatment, the total N in the topsoil increased gradually to the largest value (1349 kg ha-1) in the 2nd year (2010), then decreased gradually to the initial level (1194 kg ha-1) in the 4th year (Fig 2). Continuous application of residue (T2 treatment) led to a significant accumulation of total N in the topsoil (0–10 cm) in the first two years and the total N content remained relatively stable thereafter (on average, an increase of 14.0% compared with the initial value). The total N content in the deeper layers (10–60 cm) for the T1 treatment exhibited an obvious decline in the 4th year, whereas remaining unchanged for the T2 treatment throughout the experiment (Fig 2).


Multi-Seasonal Nitrogen Recoveries from Crop Residue in Soil and Crop in a Temperate Agro-Ecosystem.

Hu G, Liu X, He H, Zhang W, Xie H, Wu Y, Cui J, Sun C, Zhang X - PLoS ONE (2015)

Changes in soil total N content for four soil layers (0–10, 10–20, 20–40, and 40–60 cm) under different treatments during 2009 to 2012.Error bars mean standard deviations, n = 3.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507866&req=5

pone.0133437.g002: Changes in soil total N content for four soil layers (0–10, 10–20, 20–40, and 40–60 cm) under different treatments during 2009 to 2012.Error bars mean standard deviations, n = 3.
Mentions: For the T1 treatment, the total N in the topsoil increased gradually to the largest value (1349 kg ha-1) in the 2nd year (2010), then decreased gradually to the initial level (1194 kg ha-1) in the 4th year (Fig 2). Continuous application of residue (T2 treatment) led to a significant accumulation of total N in the topsoil (0–10 cm) in the first two years and the total N content remained relatively stable thereafter (on average, an increase of 14.0% compared with the initial value). The total N content in the deeper layers (10–60 cm) for the T1 treatment exhibited an obvious decline in the 4th year, whereas remaining unchanged for the T2 treatment throughout the experiment (Fig 2).

Bottom Line: On average, 8.4% of the maize residue N was recovered in the soil-crop in the 1st year, and the vast majority (61.9%-91.9%) was recovered during subsequent years.Compared to the single application, the sequential residue application significantly increased the recovery of the residue N in the soil profile (73.8% vs. 40.9%) and remarkably decreased the total and the initially applied residue derived mineral N along the soil profile.Sequential residue application significantly enhanced the retention and stabilization of the initially applied residue N in the soil and retarded its translocation along the soil profile.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110164, China; University of Chinese Academy of Sciences, Beijing, 100049, China.

ABSTRACT
In conservation tillage systems, at least 30% of the soil surface was covered by crop residues which generally contain significant amounts of nitrogen (N). However, little is known about the multi-seasonal recoveries of the N derived from these crop residues in soil-crop systems, notably in northeastern China. In a temperate agro-ecosystem, 15N-labeled maize residue was applied to field surfaces in the 1st year (2009). From the 2nd to 4th year (2010-2012), one treatment halted the application of maize residue, whereas the soil in the second treatment was re-applied with unlabeled maize residue. Crop and soil samples were collected after each harvest, and their 15N enrichments were determined on an isotope ratio mass spectrometer to trace the allocation of N derived from the initially applied maize residue in the soil-crop systems. On average, 8.4% of the maize residue N was recovered in the soil-crop in the 1st year, and the vast majority (61.9%-91.9%) was recovered during subsequent years. Throughout the experiment, the cumulative recovery of the residue N in the crop increased gradually (18.2%-20.9%), but most of the residue N was retained in the soil, notably in the 0-10 cm soil layer. Compared to the single application, the sequential residue application significantly increased the recovery of the residue N in the soil profile (73.8% vs. 40.9%) and remarkably decreased the total and the initially applied residue derived mineral N along the soil profile. Our results suggested that the residue N was actively involved in N cycling, and its release and recovery in crop and soil profile were controlled by the decomposition process. Sequential residue application significantly enhanced the retention and stabilization of the initially applied residue N in the soil and retarded its translocation along the soil profile.

No MeSH data available.