Striking a balance between N sources: Mitigating soil acidification and accumulation of phosphorous and heavy metals from manure

A - Papers appearing in refereed journals

Cai, Z., Wang, B., Zhang, L., Wen, S., Xu, M., Misselbrook, T. H., Carswell, A. M. and Gao, S. 2021. Striking a balance between N sources: Mitigating soil acidification and accumulation of phosphorous and heavy metals from manure. Science of the Total Environment. 754, p. 142189. https://doi.org/10.1016/j.scitotenv.2020.142189

AuthorsCai, Z., Wang, B., Zhang, L., Wen, S., Xu, M., Misselbrook, T. H., Carswell, A. M. and Gao, S.
Abstract

Manure amendment has been shown to effectively prevent red soil (Ferralic Cambisol) acidification from chemicalnitrogen (N) fertilization. However, information is lacking on how much manure is needed to mitigate acidificationand maintain soil productivity while preventing accumulation of other nutrients and heavy metals from long-terminputs. This study determined the effects of various combinations of manure with urea-N on acidification andchanges in soil P, K, and heavy metals in a 9-year maizefield experiment in southern China. Treatments includedchemical N, P and K fertilization only (NPKM0), and NPKplus swine manure, which supplied 20% (NPKM20), 40%(NPKM40), and 60% (NPKM60) of total N at 225 kg N ha−1year−1. Soil pH, exchangeable acidity, available P andK, and maize yield were determined annually from 2009 to 2018. Soil exchangeable base cations, total andphytoavailable Cr, Pb, As, Ni, Cd, Cu, and Zn were measured in 2018. A significant decrease in soil pH occurredunder NPKM0 and NPKM20 from initial 4.93 to 4.46 and 4.71, respectively. Whereas, under NPKM40 andNPKM60 no change or a significant increase in soil pH (to 5.47) occurred, aswell as increased exchangeable base cat-ions, and increased yields. Manure application markedly increased soil available P (but not K) to 67.6–182.6 mg kg−1and significantly increased total Pb, Cu, and Zn and available Cu and Zn in soil. The results indicate sourcing 40% orgreater of total N from manure can prevent or reverse acidification of red soil, and provide all P required, however,additional K inputs are required for balanced plant nutrient supply. An integrated approach of increasing N use effi-ciency, reducing chemical input, and reducing heavy metal concentrations in animal feed are all necessary for sus-tainable use of manure in soil acidity and nutrient management as well as minimizing environmental risks.

KeywordsSoil pH; Exchangeable aluminum; Base cations; Maize yield
Year of Publication2021
JournalScience of the Total Environment
Journal citation754, p. 142189
Digital Object Identifier (DOI)https://doi.org/10.1016/j.scitotenv.2020.142189
Open accessPublished as non-open access
FunderBBSRC Newton funding
Funder project or codeUK - China Virtual Joint Centre for Improved Nitrogen Agronomy (CINAG)
Output statusPublished
Publication dates
Online06 Sep 2020
Publication process dates
Accepted02 Sep 2020
PublisherElsevier Science Bv
ISSN0048-9697

Permalink - https://repository.rothamsted.ac.uk/item/982zq/striking-a-balance-between-n-sources-mitigating-soil-acidification-and-accumulation-of-phosphorous-and-heavy-metals-from-manure

Restricted files

Publisher's version

Under embargo indefinitely

27 total views
0 total downloads
0 views this month
0 downloads this month