scholarly journals Invader-resident relatedness and soil management history shape patterns of invasion of compost microbial populations into agricultural soils

2021 ◽  
Vol 158 ◽  
pp. 103795
Author(s):  
Kelly Gravuer ◽  
Kate M. Scow
2020 ◽  
Vol 45 (4) ◽  
Author(s):  
J. C. Onwuka ◽  
J. M. Nwaedozie ◽  
E. H. Kwon – Dung ◽  
P. T. Terna

Soil nutrient status determines its crop productivity and provide basis for appropriate soil management. The soil samples which spread across the agricultural farms along major roads in Nasarawa Eggon and Doma areas of Nasarawa State, Nigeria; were analyzed for both physical and chemical properties. Most of the studied Nasarawa Eggon and Doma soils were extremely acidic. Textural class showed high sand content (>80) of the investigated soils, indicating possible high rate of water infiltration in these soils which will lead to their low water holding capacity. The organic carbon (OC) contents in both locations, were rated high as it varied from 1.50 to 1.85 %, whereas total nitrogen (TN) levels ranged from 0.07 to 0.21 % in the studied soils. The levels of available P, Ca, K and Mg were inadequate for satisfactory plant growth, considering their respective critical level established for Nigerian soils. Mineral analysis showed the presence of essential elements such as S, K, Ca, Mg, Fe, Mn, Cu, Ni, Co, Mo and Zn. Beneficial/functional elements such as Ti, V, Rb and Sr, were found in significant quantities in the investigated soils of both studied areas. Thus, Potential K and Ca deficiency could be greatly compensated by Rb and Sr uptake. The quantities of non – beneficial elements such as Sn, Sb, Te, Cs, Ba and Sc were significant in soils from Nasarawa Eggon but were insignificant in Doma soils. Thus, this study revealed that nutrient content of the soil differs from the nutrient availability for plant uptake and the fertility of investigated soils in both locations depended on the soil pH and textural class. Also, the conditions of the soils at both studied locations, are unfavourable for plant uptake of certain important nutrients and could lead to low crop yields if there is no effective nutrient and soil management.


1995 ◽  
Vol 75 (4) ◽  
pp. 439-447 ◽  
Author(s):  
R. H. McKenzie ◽  
J. F. Dormaar ◽  
G. B. Schaalje ◽  
J. W. B. Stewart

Short-term root processes can influence chemical and biochemical conditions at the soil–plant–root interface. In this study, soil phosphorus forms, pH and biochemical properties within and adjacent to the rhizosphere of hard red spring wheat (Triticum aestivum L. ’Katepwa’) and canola (Brassica napus L. ’Westar’) seedlings were studied over a 5-wk period. Soils were from the Ap horizon of a Calcareous Dark Brown Chernozemic soil (Lethbridge, Alta) and an Orthic Gray Luvisolic soil (Breton, Alta) obtained from fertilized and unfertilized long-term continuous-cropped and wheat–fallow rotation plots. Wheat and canola both absorbed more total phosphorus (P), produced more aboveground material and had higher dehydrogenase and alkaline phosphatase activities when grown in Lethbridge soils than when grown in Breton soils. Canola took up more P from both the resin-extractable inorganic P (resin-Pi) and hydrochloric acid extractable (HCl-Pi) fractions than wheat, indicating a greater ability to extract P from soil. Acid phosphatase levels increased over time in the rhizospheres of both wheat and canola. Dehydrogenase activity was greater in the rhizospheres of wheat than of canola, indicating greater microbial activity. Canola roots frequently lowered pH within their rhizosphere which apparently suppressed microbial activity. Dehydrogenase activity in the relatively acidic Luvisolic soils was lower than in the near-neutral Chernozemic soils. The plant-root chemical and biochemical changes in the rhizosphere varied depending on soil chemical characteristics and past soil management history. Results showed canola and wheat utilize different mechanisms to influence their root rhizospheres and obtain their nutritional requirements. Rhizosphere changes were a function of plant species, soil type and previous soil management history. Key words: Rhizosphere, pH, phosphatase, dehydrogenase, P bioavailability, soil phosphorus transformations, wheat, canola


1998 ◽  
Vol 30 (14) ◽  
pp. 1917-1927 ◽  
Author(s):  
N. Gunapala ◽  
R.C. Venette ◽  
H. Ferris ◽  
K.M. Scow

Proceedings ◽  
2020 ◽  
Vol 30 (1) ◽  
pp. 89
Author(s):  
Visser Saskia ◽  
Keesstra Saskia ◽  
Ní Choncubhair Órlaith ◽  
Mulder Titia ◽  
Costantini Edoardo ◽  
...  

Our planet suffers from humankind’s impact on natural resources, biogeochemical cycles and ecosystems. Intensive modern agriculture with inappropriate inputs of fertilisers, pesticides and fossil fuel –based energy has increasingly added to human pressure on the environment. As a key element of our natural capital, soils are also under threat, despite being essential to provide food, feed, fibre and fuel for an increasing global population. Moreover, soils play a key role in carbon, water and energy cycles, highlighting their importance for biomass provision and the circular bioeconomy. Evidently, these new and complex challenges cannot be resolved effectively with existing knowledge and experience alone. These challenges require scientific research, interdisciplinary collaboration and networking to find context-specific and tailored solutions addressing societal issues of our time and facilitating the adoption of these solutions. The most effective approaches are based on the involvement of multiple actors from science, policy, economy, civil society and farming that have the same goal, work on the same societal issue, but have complementing backgrounds, expertise and perceptions. The European Joint Programme (EJP) SOIL is a European network of research institutes in the field of soil science and agricultural soil management that will provide science-based advice to practitioners and policymakers, at local, national and European level. The EJP SOIL aims to align and boost research, training and capacity building through joint programming activities co-funded by the European Commission and national research programs. This will reduce current fragmentation and help to find synergies in order to make a leapfrog in research on good agricultural soil management in three main areas: climate change mitigation and adaptation, production capacity in healthy food systems, and environmental sustainability. By joint programming, training and capacity building, EJP SOIL will also take into account the need for effective policy solutions, as well as the socio-economic conditions of all stakeholders in the agricultural value chain. Thus, a key focus of the EJP SOIL is to build and strengthen a framework for an integrated community of research groups working on related aspects of agricultural soil management. As part of this effort, EJP SOIL will co-construct with stakeholders a roadmap for agricultural soil research. To develop a structured roadmap, EJP SOIL works with a version of the knowledge management framework of Dalkir (2005). The EJP version uses four compartments: (i) Knowledge development, (ii) knowledge harmonisation, organisation and storage (iii) knowledge sharing and transfer, and (iv) knowledge application. The four segments are part of a cyclic process to enhance the development and use of knowledge on agricultural soils. Knowledge development comprises assessing new knowledge needs to achieve the expected impacts of EJP SOIL. Therefore, by involving multiple stakeholders, knowledge gaps across Europe will be identified to work towards the adoption of Climate-Smart Sustainable Agricultural Soil Management (CSSASM). Within the knowledge sharing and transfer compartment, the capacity of scientists, advisors, policy makers, farmers and other stakeholders will be strengthened. EJP SOIL will work to support networks and co-creation of new knowledge with stakeholder groups, stimulating innovation in CSSASM. The knowledge harmonization, organization and storage compartment of the knowledge framework ensures linkages with all stakeholders to guarantee data harmonization and standardization. The last compartment, application of knowledge, will be facilitated by creating better guidelines, awareness and capacity for Climate-Smart Sustainable Agricultural Soil Management adoption and by strengthening science-to-policy processes at EU and Member State level.


2017 ◽  
Vol 228 (6) ◽  
Author(s):  
Marko Šoštarić ◽  
Željka Zgorelec ◽  
Dinko Babić ◽  
Ivana Šestak ◽  
Ivica Kisić ◽  
...  

2017 ◽  
Vol 84 (2) ◽  
Author(s):  
Luis H. Orellana ◽  
Joanne C. Chee-Sanford ◽  
Robert A. Sanford ◽  
Frank E. Löffler ◽  
Konstantinos T. Konstantinidis

ABSTRACT The dynamics of individual microbial populations and their gene functions in agricultural soils, especially after major activities such as nitrogen (N) fertilization, remain elusive but are important for a better understanding of nutrient cycling. Here, we analyzed 20 short-read metagenomes collected at four time points during 1 year from two depths (0 to 5 and 20 to 30 cm) in two Midwestern agricultural sites representing contrasting soil textures (sandy versus silty loam) with similar cropping histories. Although the microbial community taxonomic and functional compositions differed between the two locations and depths, they were more stable within a depth/site throughout the year than communities in natural aquatic ecosystems. For example, among the 69 population genomes assembled from the metagenomes, 75% showed a less than 2-fold change in abundance between any two sampling points. Interestingly, six deep-branching Thaumarchaeota and three complete ammonia oxidizer (comammox) Nitrospira populations increased up to 5-fold in abundance upon the addition of N fertilizer. These results indicated that indigenous archaeal ammonia oxidizers may respond faster (are more copiotrophic) to N fertilization than previously thought. None of 29 recovered putative denitrifier genomes encoded the complete denitrification pathway, suggesting that denitrification is carried out by a collection of different populations. Altogether, our study identified novel microbial populations and genes responding to seasonal and human-induced perturbations in agricultural soils that should facilitate future monitoring efforts and N-related studies. IMPORTANCE Even though the impact of agricultural management on the microbial community structure has been recognized, an understanding of the dynamics of individual microbial populations and what functions each population carries are limited. Yet, this information is important for a better understanding of nutrient cycling, with potentially important implications for preserving nitrogen in soils and sustainability. Here, we show that reconstructed metagenome-assembled genomes (MAGs) are relatively stable in their abundance and functional gene content year round, and seasonal nitrogen fertilization has selected for novel Thaumarchaeota and comammox Nitrospira nitrifiers that are potentially less oligotrophic than their marine counterparts previously studied.


2020 ◽  
Vol 734 ◽  
pp. 139434 ◽  
Author(s):  
Massimo Fagnano ◽  
Diana Agrelli ◽  
Alberto Pascale ◽  
Paola Adamo ◽  
Nunzio Fiorentino ◽  
...  

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