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RESEARCH ARTICLE (Open Access)

Responses in growth, yield and cob protein content of baby corn (Zea mays) to amendment of an acid sulfate soil with lime, organic fertiliser and biochar

Loan K. Thi A , Isa A. M. Yunusa https://orcid.org/0000-0001-7456-3293 B * , M. A. Rab C , Ayalsew Zerihun D and Hoa M. Nguyen E
+ Author Affiliations
- Author Affiliations

A Kien Giang Agricultural Extension Center, Rach Gia, Kien Giang, Vietnam.

B Graham Centre for Agricultural Innovation, Charles Sturt University, Wagga Wagga, NSW 2650, Australia.

C School of Agriculture and Food, Faculty of Veterinary and Agricultural Science, The University of Melbourne, Parkville, Vic. 3010, Australia.

D Centre for Crop and Disease Management, School of Molecular and Life Sciences, Curtin University, Perth, WA 6845, Australia.

E Faculty of Agronomy, Can Tho University of Agriculture, Can Tho, Vietnam.

* Correspondence to: isayun8@gmail.com

Handling Editor: Zed Rengel

Crop & Pasture Science - https://doi.org/10.1071/CP21812
Submitted: 30 June 2021  Accepted: 11 April 2022   Published online: 30 May 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Cropping of acid sulfate soils requires effective treatment of their inherently low pH. We evaluated the efficacy of applications of two levels of lime (0 or 2 Mg/ha), two levels of organic fertiliser (0 or 5 Mg/ha), and three levels of biochar (0, 10 or 30 Mg/ha) in a factorial design for ameliorating acidity in an acid sulfate soil, and measured the subsequent growth and yield of baby corn (Zea mays L.). Lime increased soil pH(H2O) from 3.75 to 4.12, salinity from 1.72 to 1.95 dS/m, and cob yield by 30%. None of the amendments significantly altered total organic carbon or total nitrogen concentrations in the soil. Biochar additions increased cob yields by an average of 28% on both unlimed and limed soil. Addition of organic fertiliser increased cob yield by 45% on unlimed soil but had no significant effect on yields on limed soil. The yields obtained with liming were similar to the highest yields achieved with biochar or organic fertiliser applied either separately or in combinations. Overall, cob yields were increased by 19% with addition of organic fertiliser. The yield increseas from additions of biochar or organic fertiliser were associated with improvements in nutrient supply. However, the increases in cob yield were associated with reduced cob protein, probably resulting from poor availability of nitrogen late in the season. We conclude that biochar and organic fertiliser applied in relatively large quantities can be viable treatments for cropping acid sulfate soils.

Keywords: acid sulfate soils, cob quality, harvest index, liming, organic fertiliser, phenology, rice biochar, Vietnam.


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