دورية أكاديمية
أعرض في EDS

Direct evidence using a controlled greenhouse study for threshold effects of soil organic matter on crop growth.

التفاصيل البيبلوغرافية
العنوان: Direct evidence using a controlled greenhouse study for threshold effects of soil organic matter on crop growth.
المؤلفون: Oldfield EE; School of Forestry and Environmental Studies, Yale University, 370 Prospect Street, New Haven, Connecticut, 06511, USA., Wood SA; School of Forestry and Environmental Studies, Yale University, 370 Prospect Street, New Haven, Connecticut, 06511, USA.; The Nature Conservancy, Arlington, Virginia, 22201, USA., Bradford MA; School of Forestry and Environmental Studies, Yale University, 370 Prospect Street, New Haven, Connecticut, 06511, USA.
المصدر: Ecological applications : a publication of the Ecological Society of America [Ecol Appl] 2020 Jun; Vol. 30 (4), pp. e02073. Date of Electronic Publication: 2020 Feb 21.
نوع المنشور: Journal Article; Research Support, Non-U.S. Gov't
اللغة: English
بيانات الدورية: Publisher: Ecological Society of America Country of Publication: United States NLM ID: 9889808 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1051-0761 (Print) Linking ISSN: 10510761 NLM ISO Abbreviation: Ecol Appl Subsets: MEDLINE
أسماء مطبوعة: Publication: Washington, D.C. : Ecological Society of America
Original Publication: Tempe, AZ : The Society, 1991-
مواضيع طبية MeSH: Agriculture* , Soil*, Biomass ; Carbon ; Fertilizers ; Nitrogen/analysis ; Triticum
مستخلص: Soil organic matter (SOM) is a key indicator of soil fertility, and building SOM is assumed to decrease reliance on external inputs and ensure stable crop production. Recent syntheses of field data support this assumption with positive SOM-productivity relationships that asymptote at ~4% SOM. Teasing out the directionality of this relationship-the extent to which SOM increases crop growth vs. greater growth leading to higher SOM concentrations-requires controlled experimentation. To disentangle this causative pathway, we conducted a greenhouse experiment whereby we manipulated SOM concentrations from 1% to 9% and evaluated whether the SOM-productivity relationship differed for spring wheat (Triticum aestivum, L.) under nitrogen fertilization crossed with irrigation due to the expectation that SOM buffers the effects of reduced fertilization and/or irrigation. We found that higher concentrations of SOM led to greater productivity (measured as aboveground biomass) up to a threshold of 5% SOM, after which productivity declined across all treatments. These declines occurred despite the fact that indicators of soil health (water-holding capacity, microbial biomass, and bulk density) improved linearly with increasing SOM concentrations. That is, improvements in soil properties did not translate to gains in productivity at the highest SOM levels. Nitrogen fertilization led to greater productivity across all treatments, but to a greater relative extent at lower SOM levels, where we found that productivity on unfertilized soils with 4% SOM matched that of fertilized soils with 2% SOM. Differences in productivity on unfertilized soils due to irrigation emerged at higher SOM levels (>5%), highlighting SOM's role in water retention. Our results demonstrate that building SOM leads to improved growth of a globally important crop; however, our results also indicated a pronounced SOM threshold, after which crop growth declined. This underscores the need to develop optimal SOM targets for desired agricultural and environmental outcomes.
(© 2020 by the Ecological Society of America.)
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فهرسة مساهمة: Keywords: crop productivity; soil health; soil organic carbon; soil organic matter; soil quality; sustainable agriculture; sustainable intensification; yield
المشرفين على المادة: 0 (Fertilizers)
0 (Soil)
7440-44-0 (Carbon)
N762921K75 (Nitrogen)
تواريخ الأحداث: Date Created: 20200123 Date Completed: 20201110 Latest Revision: 20201110
رمز التحديث: 20231215
DOI: 10.1002/eap.2073
PMID: 31965653
قاعدة البيانات: MEDLINE
الوصف
تدمد:1051-0761
DOI:10.1002/eap.2073