Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/28536
Title: Influence of mulch C/N ratio and decomposition stage on plant N uptake and N availability in soil with or without wheat straw
Contributor(s): Truong, Thi Hoang Ha (author); Kristiansen, Paul  (author)orcid ; Marschner, Petra (author)
Publication Date: 2019-12
Early Online Version: 2019-08-19
DOI: 10.1002/jpln.201900067
Handle Link: https://hdl.handle.net/1959.11/28536
Abstract: Mulches can improve soil properties, but little is known about nutrient availability in mulched soil that contains plant residues and the effect of mulching with manures. The aim of this study was to determine the effects of mulching with high or low C/N organic materials, in which low C/N materials differed in decomposability, and the presence of wheat straw in the soil on plant growth and N uptake, soil N availability and microbial biomass N within about four months after mulching. Three organic materials were used: mature wheat straw (W, C/N 80), young faba bean shoots (FB, C/N 7), and sheep manure (SM, C/N 8). There were eight treatments differing in amendment methods (mulching or mixing with W or both) and mulching materials (W, FB or SM). Treatments that were only mulched with W, FB or SM are referred to as m-treatments. In m/s-treatments, after W was mixed into the soil, W, FB or SM were placed on the soil surface as mulch. Two other treatments included an unamended control and soil mixed with W. Wheat was planted 0, 35 or 70 days after mulching (referred to as 0, 35, and 70 DAM) and grown for 35 days. Faba bean mulch increased shoot dry weight, shoot N uptake and available N compared to wheat or sheep manure mulch, particularly in the m-treatments. Shoot dry weight was higher in m-treatments than corresponding m/s-treatments with the same mulch type. Shoot N uptake was higher in 70 DAM than in 0 DAM in all treatments and 0.3 to three-fold higher in m-treatments than the corresponding m/s-treatments. Microbial biomass N was higher in 0 DAM than in 35 and 70 DAM in most treatments and up to two-fold higher in m/s-treatments than the corresponding m-treatments. Available N in m/s-treatments was two to six-fold higher than m-treatments in 0 DAM, but differed little in older mulch ages of W and SM. It can be concluded that compared to soil with only mulch, mixing of wheat straw into soil reduced plant growth and N uptake, particularly in the early stages of mulching (0 and 35 DAM). However, the presence of wheat in mulched soil may provide a longer lasting source of N for plants and reduce the risk of N leaching from rapidly decomposing low C/N mulch due to greater microbial biomass N uptake than only soil with mulch.
Publication Type: Journal Article
Source of Publication: Journal of Plant Nutrition and Soil Science, 182(6), p. 879-887
Publisher: Wiley-VCH Verlag GmbH & Co KGaA
Place of Publication: Germany
ISSN: 1522-2624
1436-8730
Fields of Research (FoR) 2008: 070306 Crop and Pasture Nutrition
Fields of Research (FoR) 2020: 300407 Crop and pasture nutrition
Socio-Economic Objective (SEO) 2008: 961402 Farmland, Arable Cropland and Permanent Cropland Soils
Socio-Economic Objective (SEO) 2020: 180605 Soils
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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