Amendment with high and low C/N residues- Influence of rate, order and frequency

Abstract: It is unclear if the effect of residue mixes on soil respiration, microbial biomass and nutrient availability over time is influenced by amendment frequency and how the effect differs from that of the same residues added sequentially. There were six treatments differing in number of amendm...

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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 rate N immobilisation N mineralisation residue mixing
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000300705
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spelling	oai:scielo:S0718-951620180003007052019-01-09Amendment with high and low C/N residues- Influence of rate, order and frequencyTruong,Thi Hoang HaMarschner,Petra Amendment rate N immobilisation N mineralisation residue mixing Abstract: It is unclear if the effect of residue mixes on soil respiration, microbial biomass and nutrient availability over time is influenced by amendment frequency and how the effect differs from that of the same residues added sequentially. There were six treatments differing in number of amendments and order in which residues were added, total amendment rate in all treatments was 20 g kg-1 with 10 g kg-1 of each high (H) and low (L) C/N residue. In treatment names, order of letters indicates order of residues, e.g. HL is H followed by L. In treatments with two amendments, residues were added on days 0 and 20 at 10 g kg-1: 10-LH, 10-HL or a 1:1 mixture of L and H added twice [10-(HL)x2]. In treatments with four amendments, residues were added on days 0, 10, 20 and 30 at 5 g kg-1: 5-HLHL, 5-LHLH, and 5(HL)x4. In 5-HLHL, microbial biomass N (MBN) increased only after the first L addition although available N increased after both additions. Differences between measured and expected value depended on residue addition frequency and parameter. In 10-(HL)x2, MBN, microbial biomass P and C (MBP and MBC) were greater than expected and this was accompanied by lower than expected available N and P. In 5-(HL)x4 on the other hand, the difference between measured and expected MBN and available N changed over time, possibly because the proximity of microbes decomposing different residues changes. The study showed that with repeated addition of H and L, N availability and MBN are influenced by residue rate and order.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.3 20182018-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000300705en10.4067/S0718-95162018005002101
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Amendment rate N immobilisation N mineralisation residue mixing
spellingShingle	Amendment rate N immobilisation N mineralisation residue mixing Truong,Thi Hoang Ha Marschner,Petra Amendment with high and low C/N residues- Influence of rate, order and frequency
description	Abstract: It is unclear if the effect of residue mixes on soil respiration, microbial biomass and nutrient availability over time is influenced by amendment frequency and how the effect differs from that of the same residues added sequentially. There were six treatments differing in number of amendments and order in which residues were added, total amendment rate in all treatments was 20 g kg-1 with 10 g kg-1 of each high (H) and low (L) C/N residue. In treatment names, order of letters indicates order of residues, e.g. HL is H followed by L. In treatments with two amendments, residues were added on days 0 and 20 at 10 g kg-1: 10-LH, 10-HL or a 1:1 mixture of L and H added twice [10-(HL)x2]. In treatments with four amendments, residues were added on days 0, 10, 20 and 30 at 5 g kg-1: 5-HLHL, 5-LHLH, and 5(HL)x4. In 5-HLHL, microbial biomass N (MBN) increased only after the first L addition although available N increased after both additions. Differences between measured and expected value depended on residue addition frequency and parameter. In 10-(HL)x2, MBN, microbial biomass P and C (MBP and MBC) were greater than expected and this was accompanied by lower than expected available N and P. In 5-(HL)x4 on the other hand, the difference between measured and expected MBN and available N changed over time, possibly because the proximity of microbes decomposing different residues changes. The study showed that with repeated addition of H and L, N availability and MBN are influenced by residue rate and order.
author	Truong,Thi Hoang Ha Marschner,Petra
author_facet	Truong,Thi Hoang Ha Marschner,Petra
author_sort	Truong,Thi Hoang Ha
title	Amendment with high and low C/N residues- Influence of rate, order and frequency
title_short	Amendment with high and low C/N residues- Influence of rate, order and frequency
title_full	Amendment with high and low C/N residues- Influence of rate, order and frequency
title_fullStr	Amendment with high and low C/N residues- Influence of rate, order and frequency
title_full_unstemmed	Amendment with high and low C/N residues- Influence of rate, order and frequency
title_sort	amendment with high and low c/n residues- influence of rate, order 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=S0718-95162018000300705
work_keys_str_mv	AT truongthihoangha amendmentwithhighandlowcnresiduesinfluenceofrateorderandfrequency AT marschnerpetra amendmentwithhighandlowcnresiduesinfluenceofrateorderandfrequency
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Amendment with high and low C/N residues- Influence of rate, order and frequency

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