Transformations and recovery of residue and fertilizer nitrogen-15 in a sandy Lixisol of West Africa

Ibewiro, B; Sanginga, N.; Vanlauwe, Bernard; Merckx, Roel

doi:10.1007/s003740050655

Cited by 10 publications

(4 citation statements)

References 17 publications

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“…Despite in some sites net N immobilization was detected on residues, generally they released N. Nevertheless, even in sites where residues released N, immobilization may have occurred in other organic pools. Some experiments showed that incorporation of residues led to an increase of soil microbial biomass N by immobilization of mineral N (Ibewiro et al, 2000, Korsaeth et al, 2001). Additionally, the soil light fraction (Whalen et al, 2000), or the soil fraction > 200 microns (Recous et al, 1998) may be acting as a N sink.…”

Section: Discussionmentioning

confidence: 99%

Modeling Apparent Nitrogen Mineralization under Field Conditions Using Regressions and Artificial Neural Networks

Álvarez

Steinbach

2011

Agronomy Journal

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Soil N mineralization is an important source of N for grain crops, but its estimation under fi eld conditions is usually very difficult. Our objective was to develop models suitable for predicting N mineralization during the growing seasons of wheat (Triticum aestivum L.) and corn (Zea mays L.) under fi eld conditions. Fift y-eight fi eld experiments were performed with wheat, and 35 with corn, along three growing seasons, in which soil apparent N mineralization was estimated by the mass balance approach. Apparent nitrogen mineralized from decomposing residues (ANMR) or soil humic substances (ANMH) were estimated separately. Two empirical modeling techniques were tested, linear regression and artifi cial neural networks, using as independent variables or inputs some environmental variables. Both techniques allowed the development of suitable models for N mineralization prediction (R 2 > 0.68), but neural networks gave slightly better results. Th e ANMR ranged from −42 to 64 kg N ha −1 , increasing as residue mass and N concentration increased. An average ANMR of 15 to 16 kg N ha −1 was produced both during wheat and corn growing seasons. Th e ANMH ranged from −80 to 328 kg N ha −1 , being on average four times greater during corn growing cycle than during wheat season (127 vs. 34 kg N ha −1 ). Th e ANMH decreased as initial mineral N content of the soil, remaining residue mass or fi ne particles content of the soil increased, and it was greater in soils of higher organic matter level and mineralization potential, as determined by an incubation test. Increases in temperature and rainfall also determine greater ANMH. Th e methodology developed for apparent N mineralization estimation may be applied to other crops and production regions.

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Section: Discussionmentioning

confidence: 99%

Modeling Apparent Nitrogen Mineralization under Field Conditions Using Regressions and Artificial Neural Networks

Álvarez

Steinbach

2011

Agronomy Journal

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“…Unlike inorganic N fertilizers, the transformation dynamics and distribution of crop residue N in soil-crop systems are closely linked to crop residue decomposition [ 14 , 15 ]. The rate and process of crop residue decomposition are mainly influenced by the followings: (1) the qualities of the residue, including C/N ratio, lignin, and polyphenol contents [ 16 , 17 ]; (2) the placement of the residue, e.g., incorporation into soil or surface application [ 18 ]; and (3) environmental and soil factors such as precipitation, temperature, and biota [ 13 , 19 , 20 ]. These internal and environmental factors jointly influence the biochemical transformation of crop residue N, and thus alter its temporal and spatial transfer and allocation in soil-crop systems [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…These internal and environmental factors jointly influence the biochemical transformation of crop residue N, and thus alter its temporal and spatial transfer and allocation in soil-crop systems [ 21 , 22 ]. By using an isotope tracing technique (i.e., the crop residue was 15 N-labeled), the recovery of N derived from incorporated crop residue in soil-crop systems has been studied in both tropical and temperate regions [ 11 , 13 , 20 , 23 ]. Unfortunately, the majority of these studies are limited to measuring the recovery of residue N by the first crop following residue application; whereas, the processes and mechanisms of N cycling associated with the release dynamics of crop residue N have not been fully studied [ 19 , 22 , 24 ], notably in conservation tillage systems.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

et al. 2015

PLoS ONE

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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.

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“…An additional reason for low recovery rates could be the incorporation into the SOM fraction [61] which was proved for tropical soils in Indonesia [62] and Western Africa [63], respectively. A long-term study by Devevre and Horwath [64] illustrated an increased stabilization of fertilizer N into SOM 160 days after rice straw addition compared to soils solely treated with (NH 4 ) 2 SO 4 .…”

Section: Effects Of N Fertilizer Type On N and C Cyclingmentioning

confidence: 99%

Different fertilizer types affected nitrogen and carbon cycling in eroded and colluvial soils of Southern Ecuador

Bahr¹,

Hamer²,

Zaragocin³

et al. 2013

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Transformations and recovery of residue and fertilizer nitrogen-15 in a sandy Lixisol of West Africa

Cited by 10 publications

References 17 publications

Modeling Apparent Nitrogen Mineralization under Field Conditions Using Regressions and Artificial Neural Networks

Modeling Apparent Nitrogen Mineralization under Field Conditions Using Regressions and Artificial Neural Networks

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

Different fertilizer types affected nitrogen and carbon cycling in eroded and colluvial soils of Southern Ecuador

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