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| Tahir,Majid Mahmood; Recous,Sylvie; Aita,Celso; Pfeifer,Ismael Cristiano; Chaves,Bruno; Giacomini,Sandro José. |
| ABSTRACT Isotopic labeling of plants is useful in tracking the fate of carbon (C) from different plant parts in a soil-plant system when these parts decompose simultaneously. Pulse labeling is a relatively simple technique and is amenable for use in the field. Therefore, we evaluated a 13CO2 pulse-labeling method to label crop plants under subtropical field conditions for simultaneous root and shoot decomposition studies. Wheat (Triticum aestivum L.), pea (Pisum sativum L.), and vetch (Vicia sativa L.) plants were grown inside polyvinyl chloride (PVC) cylinders and pulse labeled once a week for a total of 11 times. After harvest, “paired” treatments were designed by combining 13C-labeled shoots with unlabeled roots and unlabeled shoots with 13C-labeled... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 13CO2; C mineralization; Chemical fractions; Isotopic homogeneity; Plant parts. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100404 |
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| Redin,Marciel; Recous,Sylvie; Aita,Celso; Chaves,Bruno; Pfeifer,Ismael Cristiano; Bastos,Leonardo Mendes; Pilecco,Getúlio Elias; Giacomini,Sandro José. |
| ABSTRACT Recycling of carbon (C) and nitrogen (N) from plants into soils is decisive for maintaining soil organic matter and soil fertility. Therefore, we quantified plant biomass and C and N in the shoots and roots from the topsoil layer for a wide range of annual crops grown under subtropical conditions. We grew 26 species, 13 main crops, and 13 cover crops, in the field in standard sowing arrangements. Root biomass was recovered from the 0.00-0.20 m soil layer at flowering, and shoot biomass was measured at flowering for all crops and at maturity only for the main crops. Root dry matter (DM) exhibited an average of 14.9 ± 5.7 % of the total shoot biomass at flowering, and the mean shoot DM to root DM ratio was 6.9 (2.8-15.0) for the 26 crops considered.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomass allocation; Cover crops; Fabaceae; Poaceae; Shoot to root ratio. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100528 |
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