Amino acid biodegradation and its potential e_ects on organic nitrogen capture by plants

Tipo de material: Texto

TextoSeries ; Soil Biology & BioChemistry, 31, p.613-622, 1999Trabajos contenidos:

Jones, D.L

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Resumen: It has been reported that plant roots can directly utilise soil organic-N in the form of amino acids without prior mineralisation by the soil's microbial biomass. To critically assess this, however, requires a knowledge of microbial amino acid- N turnover times in soil. The e_ects of soil type, depth and temperature on the uptake and partitioning of a mixture of 15 14C- labelled amino acids by the soil's microbial biomass was therefore studied in 10 contrasting soil types. The results indicated that the degradation of amino acids was soil dependent but that the mean half-life in topsoils at 188C was 1.720.6 h, whilst in subsoils the mean half-life was 12.223.3 h. On average 34

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It has been reported that plant roots can directly utilise soil organic-N in the form of amino acids without prior mineralisation by the soil's microbial biomass. To critically assess this, however, requires a knowledge of microbial amino acid- N turnover times in soil. The e_ects of soil type, depth and temperature on the uptake and partitioning of a mixture of 15 14C- labelled amino acids by the soil's microbial biomass was therefore studied in 10 contrasting soil types. The results indicated that the degradation of amino acids was soil dependent but that the mean half-life in topsoils at 188C was 1.720.6 h, whilst in subsoils the mean half-life was 12.223.3 h. On average 34

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