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Improvement in dryland crop performance and soil properties with multiple annual applications of lignite-derived humic amendment

文献类型： 外文期刊

作者： Ma, Bin 1 ; Ma, Bao-Luo 1 ; McLaughlin, Neil B. 2 ; Li, Ming 3 ; Liu, Jinghui 1 ;

作者机构： 1.Inner Mongolia Agr Univ, Natl Outstanding Agr Res Talents Innovat Team, Hohhot 010019, Inner Mongolia, Peoples R China

2.Agr & Agri Food Canada, Ottawa Res & Dev Ctr, Ottawa, ON K1A 0C6, Canada

3.Ningxia Acad Agr & Forestry Sci, Inst Desertificat Control, Yinchuan 750002, Ningxia, Peoples R China

关键词： Dryland oat yield; Grain quality; Humic amendment; Carbon sequestration; Enzyme activity; Ecological effect

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：7.366； 五年影响因子：7.829 ）

ISSN： 0167-1987

年卷期： 2022 年 218 卷

页码：

收录情况： SCI

摘要： Humic amendment (HA) is increasingly being evaluated and utilized to improve soil health and crop productivity in intensely farmed arid and semi-arid regions. However, the scientific comparison of field-scale use of single vs. repeated application of HA has not been reported. A field study was conducted to quantify the effect of different numbers of annual HA applications on (i) oat crop performance indicators, and (ii) the changes in soil health metrics in a dryland farming ecosystem. We found that multiple years of annual HA application improved crop growth, and increased grain protein yield (up to 60%), grain yield (21%), water use efficiency (22%), partial factor productivity of nitrogen (21%) and economic benefit (34%) over that for the control (no HA) during both a wetter and a drier growing season. The greater input of crop residue associated with higher yields led to an increase of soil organic carbon and water storage at both 0-20 and 20-60 cm soil layers, and a reduction in soil electrical conductivity, pH and bulk density with increasing years of HA application. There was an overall improvement in soil micro-environmental conditions. These in turn promoted an increased activity of the soil enzymes urease (up to 89%), invertase and catalase and soil nutrient turnover and availability (e.g. up to 58% higher plant available nitrogen). Our results show for the first time that repeated annual HA application of at least 2 years would be a cost-effective strategy to combat land degradation and nurture sustainable crop production in dryland agriculture under widely varying weather scenarios expected with climate change.

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