Soil microbial communities under cacao agroforestry and cover crop systems in Peru

2017 ◽  
Vol 120 ◽  
pp. 273-280 ◽  
Author(s):  
Jeffrey S. Buyer ◽  
Virupax C. Baligar ◽  
Zhenli He ◽  
Enrique Arévalo-Gardini
Keyword(s):  
Microbial Communities ◽  
Cover Crop ◽  
Soil Microbial Communities ◽  
Soil Microbial

scholarly journals Cover crop-driven shifts in soil microbial communities could modulate tomato early crop growth via plant-soil feedbacks

2021 ◽  
Author(s):  
Micaela Tosi ◽  
John Drummelsmith ◽  
Dasiel Obregón ◽  
Inderjot Chahal ◽  
Laura L. Van Eerd ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Cover Crops ◽  
Cover Crop ◽  
Crop Residues ◽  
Management Strategies ◽  
Soil Microbial Communities ◽  
Crop Productivity ◽  
Residue Management ◽  
Soil Microbial ◽  
Plant Soil

Abstract Sustainable agricultural practices such as crop diversification, cover crops and residue retention are increasingly applied to counteract detrimental effects of agriculture on natural resources. Since part of their effects occur via changes soil microbial communities, it is critical to understand how these respond to different practices. Our study analyzed five cover crop (cc) treatments (oat, rye, radish, rye-radish mixture and no-cc control) and two crop residue management strategies (retention/R+ or removal/R-) in an 8-year diverse horticultural crop rotation trial from ON, Canada. Cc effects were small but stronger than those of residue management. Radish-based cover crops tended to be the most beneficial for both microbial abundance and richness, yet detrimental for fungal evenness. Cc species, in particular radish, also shaped fungal and, to a lesser extent, prokaryotic community composition. Crop residues modulated cc effects on bacterial abundance and fungal evenness (i.e., more sensitive in R- than R+), as well as microbial taxa. Several microbial structure features, some affected by cc, were correlated with early tomato growth in the following spring (e.g., composition, taxa within Actinobacteria, Firmicutes and Ascomycota). Our study suggests that, whereas mid-term cc effects were small, they need to be better understood as they could be influencing crop productivity via plant-soil feedbacks.

scholarly journals Rotation and Cover Crop Effects on Soilborne Potato Diseases, Tuber Yield, and Soil Microbial Communities

Plant Disease ◽  
2010 ◽  
Vol 94 (12) ◽  
pp. 1491-1502 ◽  
Author(s):  
Robert P. Larkin ◽  
Timothy S. Griffin ◽  
C. Wayne Honeycutt
Keyword(s):  
Microbial Communities ◽  
Verticillium Wilt ◽  
Cover Crop ◽  
Common Scab ◽  
Tuber Yield ◽  
Soil Microbial Communities ◽  
Black Scurf ◽  
Winter Rye ◽  
Bacterial Populations ◽  
Soil Microbial

Seven different 2-year rotations, consisting of barley/clover, canola, green bean, millet/rapeseed, soybean, sweet corn, and potato, all followed by potato, were assessed over 10 years (1997–2006) in a long-term cropping system trial for their effects on the development of soilborne potato diseases, tuber yield, and soil microbial communities. These same rotations were also assessed with and without the addition of a fall cover crop of no-tilled winter rye (except for barley/clover, for which underseeded ryegrass was substituted for clover) over a 4-year period. Canola and rapeseed rotations consistently reduced the severity of Rhizoctonia canker, black scurf, and common scab (18 to 38% reduction), and canola rotations resulted in higher tuber yields than continuous potato or barley/clover (6.8 to 8.2% higher). Addition of the winter rye cover crop further reduced black scurf and common scab (average 12.5 and 7.2% reduction, respectively) across all rotations. The combined effect of a canola or rapeseed rotation and winter rye cover crop reduced disease severity by 35 to 41% for black scurf and 20 to 33% for common scab relative to continuous potato with no cover crop. Verticillium wilt became a prominent disease problem only after four full rotation cycles, with high disease levels in all plots; however, incidence was lowest in barley rotations. Barley/clover and rapeseed rotations resulted in the highest soil bacterial populations and microbial activity, and all rotations had distinct effects on soil microbial community characteristics. Addition of a cover crop also resulted in increases in bacterial populations and microbial activity and had significant effects on soil microbial characteristics, in addition to slightly improving tuber yield (4% increase). Thus, in addition to positive effects in reducing erosion and improving soil quality, effective crop rotations in conjunction with planting cover crops can provide improved control of soilborne diseases. However, this study also demonstrated limitations with 2-year rotations in general, because all rotations resulted in increasing levels of common scab and Verticillium wilt over time.

scholarly journals SOIL MICROBIAL COMMUNITIES AS AFFECTED BY A COMMERCIAL ORGANIC FERTILIZER AND SUNN HEMP AS A COVER CROP IN ORGANIC SWEET PEPPER PRODUCTION IN PUERTO RICO

1969 ◽  
Vol 99 (1) ◽  
pp. 53-57
Author(s):  
Ana Negrete ◽  
Elide Valencia-Chin ◽  
Verónica Acosta-Martínez
Keyword(s):  
Puerto Rico ◽  
Microbial Communities ◽  
Cover Crop ◽  
Organic Fertilizer ◽  
Soil Microbial Communities ◽  
Sweet Pepper ◽  
Soil Microbial ◽  
Sunn Hemp

SOIL MICROBIAL COMMUNITIES AS AFFECTED BY A COMMERCIAL ORGANIC FERTILIZER AND SUNN HEMP AS A COVER CROP IN ORGANIC SWEET PEPPER PRODUCTION IN PUERTO RICO

Cover Crop and Irrigation Effects on Soil Microbial Communities and Enzymes in Semiarid Agroecosystems of the Central Great Plains of North America

Pedosphere ◽  
2016 ◽  
Vol 26 (2) ◽  
pp. 192-205 ◽  
Author(s):  
Francisco J. CALDERÓN ◽  
David NIELSEN ◽  
Veronica ACOSTA-MARTÍNEZ ◽  
Merle F. VIGIL ◽  
Drew LYON
Keyword(s):  
North America ◽  
Microbial Communities ◽  
Great Plains ◽  
Cover Crop ◽  
Soil Microbial Communities ◽  
Soil Microbial ◽  
Irrigation Effects

Alkaline soil pH affects bulk soil, rhizosphere and root endosphere microbiomes of plants growing in a Sandhills ecosystem

2021 ◽  
Vol 97 (4) ◽  
Author(s):  
Lucas Dantas Lopes ◽  
Jingjie Hao ◽  
Daniel P Schachtman
Keyword(s):  
Microbial Communities ◽  
Plant Species ◽  
Soil Ph ◽  
Soil Microbial Communities ◽  
Bulk Soil ◽  
Strong Impact ◽  
Alkaline Soil ◽  
Alkaline Soils ◽  
Soil Microbial ◽  
Soil Rhizosphere

ABSTRACT Soil pH is a major factor shaping bulk soil microbial communities. However, it is unclear whether the belowground microbial habitats shaped by plants (e.g. rhizosphere and root endosphere) are also affected by soil pH. We investigated this question by comparing the microbial communities associated with plants growing in neutral and strongly alkaline soils in the Sandhills, which is the largest sand dune complex in the northern hemisphere. Bulk soil, rhizosphere and root endosphere DNA were extracted from multiple plant species and analyzed using 16S rRNA amplicon sequencing. Results showed that rhizosphere, root endosphere and bulk soil microbiomes were different in the contrasting soil pH ranges. The strongest impact of plant species on the belowground microbiomes was in alkaline soils, suggesting a greater selective effect under alkali stress. Evaluation of soil chemical components showed that in addition to soil pH, cation exchange capacity also had a strong impact on shaping bulk soil microbial communities. This study extends our knowledge regarding the importance of pH to microbial ecology showing that root endosphere and rhizosphere microbial communities were also influenced by this soil component, and highlights the important role that plants play particularly in shaping the belowground microbiomes in alkaline soils.

Sign in / Sign up

Export Citation Format

Share Document