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| Registros recuperados: 20 | |
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| Dakhel, N.; Barriuso, E.; Charnay, M.P.; Touratier, C.; Ambrosi, D.. |
| The fate of [14C]-amitrole herbicide was studied in eight soils having different capacities for amitrole mineralisation. Laboratory incubations were run combining different experimental conditions: temperature (4, 28 and 50°C), soil moisture (50, 100 and 150% of soil water holding capacity) and microbial activity (sterile and non-sterile conditions). During incubation, samples of the soils were periodically extracted with 0.5 M NH4OH and extracts were analysed by HPLC. The lengths of time needed for 50% dissipation of amitrole (DT50) in soils ranged from less than 1 day to more than 70 days. Amitrole mineralisation occurred only in non-sterile soils, showing that it is a biological process. Mineralisation was lower in soils with a coarse texture than in... |
| Tipo: Journal Article |
Palavras-chave: AMITROLE; ACTIVITE MICROBIENNE; PERSISTANCE DES RESIDUS; VIGNOBLE; FACTEUR DU MILIEU; MICROORGANISME DU SOL; HUMIDITE DU SOL; SCIENCES DU SOL. |
| Ano: 2001 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0100021917088076&uri=/notices/prodinra1/2011/03/ |
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| Koutika, L.S.; Chone, T.; Andreux, F.; Cerri, C.C.. |
| The topsoils of two sites, comprising natural forest and 4- and 20-year-old pastures, respectively, were selected in Rondônia to evaluate the changes of soil organic matter due to pasture establishment. These changes were evaluated by measuring the proportions of the C and N associated with clay and silt fractions, and by the C decomposition (CD) rate of the whole topsoils and their size fractions. The topsoils studied had large proportions of C and N associated with fine fractions, especially with clay fractions. The CD rate of the silt fractions was higher than that of the clay fractions under the two forest topsoils and under the 20-year-old pasture. The CD rate of the silt fractions under forest vegetation at each site was significantly higher than... |
| Tipo: Journal Article |
Palavras-chave: DECOMPOSITION; TOPSOL; SCIENCES DU SOL. |
| Ano: 2000 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0300033138095942&uri=/notices/prodinra1/2010/12/ |
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| Koutika, L.S.; Andreux, F.; Hassink, J.; Chone, T.; Cerri, C.C.. |
| In topsoils under forest and 7-, 12- and 17-year-old pastures, organic matter was characterized by analysing C and N distribution in particle-size fractions, the C decomposition rates of soil and particle-size fractions and by employing density-fractionation of macro-organic matter (>150 μm). The C and N associated with clay fractions increased with increasing age of pasture. The weight (%) of macro-organic matter and its heavy fractions (>1.37 g cm–3) also increased with increasing age of pasture. However, in a long-term incubation (100 days), these changes seemed to involve an increase in the C decomposition rate in the topsoil of the oldest pasture. Using the C decomposition rates of particle-size fractions, it appeared that silt and clay... |
| Tipo: Journal Article |
Palavras-chave: SCIENCES DU SOL; AMAZONIE; TOPSOL; FORET PLUVIALE; MATIERE ORGANIQUE DU SOL; DECOMPOSITION; FRACTION ARGILEUSE; TAILLE DES PARTICULES. |
| Ano: 1999 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0300033143095947&uri=/notices/prodinra1/2010/12/ |
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| Dousset, S.; Morel, J.L.; Jacobson, A.; Bitton, G.. |
| Cu binding to root exudates of two cultivated plants, wheat (Triticum aestivum) and rape (Brassica napus), and two weeds associated with wheat, dog daisy (Matricaria inodora) and cornflower (Centaurea cyanus), was studied in vitro under hydroponic and sterile conditions. Nutrient solutions were prepared with or without P. A MetPLATE microbiological test was used to assess the metal complexing capacity of root exudates. In the P-deficient solutions, no exudation was observed for any of the four plants; consequently, no Cu binding occurred. When P was present in the nutrient solutions, the plant exudates displayed differing abilities to complex Cu. No difference was detected in the binding capacity of the dog daisy or cornflower, and the blank [heavy metal... |
| Tipo: Journal Article |
Palavras-chave: SOLUTION NUTRITIVE; CAPACITE DE LIAISON; SCIENCES DU SOL; ECOPHYSIOLOGIE VEGETALE; PLANTE; EXSUDAT; CUIVRE; ELEMENT METALLIQUE; ELEMENT TRACE; CULTURE HYDROPONIQUE; RELATION PLANTE SOL. |
| Ano: 2001 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0300033064095630&uri=/notices/prodinra1/2010/12/ |
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| Koutika, L.S.; Choné, T.; Andreux, F.; Burtin, G.; Cerri, C.C.. |
| The influence of texture and local climate, especially precipitation, on C decomposition was evaluated in topsoils under forest and pastures at different sites located in the western, central, and eastern Brazilian Amazon Basin. Independent of the geographical location and vegetation cover, C decomposition was lower in topsoils of fine texture with a sand/clay ratio of less than 1, compared to topsoils of coarse a texture with a sand/clay ratio ranging from 2 to 8. In the former, the low sand/clay ratio appears to reduce C decomposition. In the latter, besides the effect of the high sand/clay ratio, the local climate, especially the annual precipitation, seems to play an important role in controlling C decomposition. |
| Tipo: Journal Article |
Palavras-chave: PLUVIOMETRIE; SCIENCES DU SOL; AMAZONIE; DECOMPOSITION; MATIERE ORGANIQUE DU SOL; TOPSOL; TEXTURE DU SOL; FRACTION ARGILEUSE. |
| Ano: 1999 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0300033151096109&uri=/notices/prodinra1/2010/12/ |
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| Registros recuperados: 20 | |
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