Addition of residues with different C/N ratio in soil over time individually or as mixes - effect on nutrient availability and microbial biomass depends on amendment rate and frequency

Abstract: Residues with different properties may be added to soil simultaneously (as mixes) or after each other. In most previous studies on the effect of mixes on decomposition and nutrient release, residues were added once at the start of the experiment. Less is known about the effect of mixtures...

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Autores principales:	Truong,Thi Hoang Ha, Marschner,Petra
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2018
Materias:	Amendment addition frequency C/N ratio MBN microbial biomass mixes N availability
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000401157
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spelling	oai:scielo:S0718-951620180004011572019-02-05Addition of residues with different C/N ratio in soil over time individually or as mixes - effect on nutrient availability and microbial biomass depends on amendment rate and frequencyTruong,Thi Hoang HaMarschner,Petra Amendment addition frequency C/N ratio MBN microbial biomass mixes N availability Abstract: Residues with different properties may be added to soil simultaneously (as mixes) or after each other. In most previous studies on the effect of mixes on decomposition and nutrient release, residues were added once at the start of the experiment. Less is known about the effect of mixtures added more than once on soil respiration, microbial biomass and nutrient availability and how the addition frequency influences interactions between high C/N (H) and low C/N (L) residues in mixes. In the 48-day incubation experiment with total amendment rate in all treatments was 20 g kg-1, treatments differed in addition frequency (twice, four or eight times), rate (10, 5 or 2.5 g kg-1) as well as order of H and L. Soil was sampled every 12 days. Treatments had similar total cumulative respiration, but differed in distribution over the 12 day periods. Available N and MBN changed strongly over time in treatments with 10 or 5 g kg-1, depending on the C/N ratio of the residue added before sampling. Frequent addition of small amounts of residues (2.5 g kg-1) limited microbial N uptake initially compared to higher amendment rates, but resulted in similar available N irrespective of the C/N ratio of the residue added. It can be concluded that with less frequent residue addition, microbes decompose mainly the recently added residue. With more frequent addition, microbes decompose recently added residue together with residue added before the most recent amendment.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.18 n.4 20182018-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000401157en10.4067/S0718-95162018005003401
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Amendment addition frequency C/N ratio MBN microbial biomass mixes N availability
spellingShingle	Amendment addition frequency C/N ratio MBN microbial biomass mixes N availability Truong,Thi Hoang Ha Marschner,Petra Addition of residues with different C/N ratio in soil over time individually or as mixes - effect on nutrient availability and microbial biomass depends on amendment rate and frequency
description	Abstract: Residues with different properties may be added to soil simultaneously (as mixes) or after each other. In most previous studies on the effect of mixes on decomposition and nutrient release, residues were added once at the start of the experiment. Less is known about the effect of mixtures added more than once on soil respiration, microbial biomass and nutrient availability and how the addition frequency influences interactions between high C/N (H) and low C/N (L) residues in mixes. In the 48-day incubation experiment with total amendment rate in all treatments was 20 g kg-1, treatments differed in addition frequency (twice, four or eight times), rate (10, 5 or 2.5 g kg-1) as well as order of H and L. Soil was sampled every 12 days. Treatments had similar total cumulative respiration, but differed in distribution over the 12 day periods. Available N and MBN changed strongly over time in treatments with 10 or 5 g kg-1, depending on the C/N ratio of the residue added before sampling. Frequent addition of small amounts of residues (2.5 g kg-1) limited microbial N uptake initially compared to higher amendment rates, but resulted in similar available N irrespective of the C/N ratio of the residue added. It can be concluded that with less frequent residue addition, microbes decompose mainly the recently added residue. With more frequent addition, microbes decompose recently added residue together with residue added before the most recent amendment.
author	Truong,Thi Hoang Ha Marschner,Petra
author_facet	Truong,Thi Hoang Ha Marschner,Petra
author_sort	Truong,Thi Hoang Ha
title	Addition of residues with different C/N ratio in soil over time individually or as mixes - effect on nutrient availability and microbial biomass depends on amendment rate and frequency
title_short	Addition of residues with different C/N ratio in soil over time individually or as mixes - effect on nutrient availability and microbial biomass depends on amendment rate and frequency
title_full	Addition of residues with different C/N ratio in soil over time individually or as mixes - effect on nutrient availability and microbial biomass depends on amendment rate and frequency
title_fullStr	Addition of residues with different C/N ratio in soil over time individually or as mixes - effect on nutrient availability and microbial biomass depends on amendment rate and frequency
title_full_unstemmed	Addition of residues with different C/N ratio in soil over time individually or as mixes - effect on nutrient availability and microbial biomass depends on amendment rate and frequency
title_sort	addition of residues with different c/n ratio in soil over time individually or as mixes - effect on nutrient availability and microbial biomass depends on amendment rate and frequency
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000401157
work_keys_str_mv	AT truongthihoangha additionofresidueswithdifferentcnratioinsoilovertimeindividuallyorasmixeseffectonnutrientavailabilityandmicrobialbiomassdependsonamendmentrateandfrequency AT marschnerpetra additionofresidueswithdifferentcnratioinsoilovertimeindividuallyorasmixeseffectonnutrientavailabilityandmicrobialbiomassdependsonamendmentrateandfrequency
_version_	1714206590451580928

Addition of residues with different C/N ratio in soil over time individually or as mixes - effect on nutrient availability and microbial biomass depends on amendment rate and frequency

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