scholarly journals Silicon substances for restoration of oil-contaminated areas

2021 ◽  
Vol 931 (1) ◽  
pp. 012015
Author(s):  
P Zhang ◽  
V V Matichenkov ◽  
E A Bocharnikova ◽  
S M Sevostianov
Keyword(s):  
Plant Growth ◽  
Plant Biomass ◽  
Antioxidant Activities ◽  
Water Soluble ◽  
Soil Reclamation ◽  
Plant Tolerance ◽  
Soil Enzymatic Activity ◽  
Soil Microbial ◽  
Grey Forest Soil ◽  
Soil Microbial Population

Abstract Numerous investigations demonstrate that active forms of silicon (Si) enhance the plant tolerance against abiotic stresses by several mechanisms, including increasing the antioxidant activities and minimizing oxidative damage. Soil contamination with oil and oil products relates to abiotic stress that detrimentally affects soil microbial population and plant growth. Considering the crucial role of microorganisms and plants in bioremediation of oil-polluted areas, Si substances can be beneficial to acceleration of soil reclamation. In greenhouse experiment, wheat was grown in Grey Forest Soil contaminated with used motor oil. The effect of fumed silica and monosilicic acid on soil enzymatic activity and plant growth was studied. Both Si substances provided increasing the plant biomass and the activities of catalase and dehydrogenase. As regards the plant growth, the effect of Si was more pronounced in polluted soil, while the enzyme activity was higher affected in unpolluted soil. The activities of catalase and dehydrogenase were closely correlated to the water-soluble Si in soil (R=0.91-0.92). Silicon substances with high content of, plant-and microorganism-available Si might be promising for involvement in bioremediation technology for oil-contaminated soil.

Can repeated soil amendment with biogas digestates increase soil suppressiveness toward non-specific soil-borne pathogens in agricultural lands?

2020 ◽  
pp. 1-12
Author(s):  
L. M. Manici ◽  
F. Caputo ◽  
G. A. Cappelli ◽  
E. Ceotto
Keyword(s):  
Plant Growth ◽  
Biomass Production ◽  
Soil Amendment ◽  
Plant Biomass ◽  
Amended Soils ◽  
Soil Suppressiveness ◽  
Soil Microbial ◽  
Soil Borne Pathogens ◽  
The Impact ◽  
Plant Biomass Production

Abstract Soil suppressiveness which is the natural ability of soil to support optimal plant growth and health is the resultant of multiple soil microbial components; which implies many difficulties when estimating this soil condition. Microbial benefits for plant health from repeated digestate applications were assessed in three experimental sites surrounding anaerobic biogas plants in an intensively cultivated area of northern Italy. A 2-yr trial was performed in 2017 and 2018 by performing an in-pot plant growth assay, using soil samples taken from two fields for each experimental site, of which one had been repeatedly amended with anaerobic biogas digestate and the other had not. These fields were similar in management and crop sequences (maize was the recurrent crop) for the last 10 yr. Plant growth response in the bioassay was expressed as plant biomass production, root colonization frequency by soil-borne fungi were estimated to evaluate the impact of soil-borne pathogens on plant growth, abundance of Pseudomonas and actinomycetes populations in rhizosphere were estimated as beneficial soil microbial indicators. Repeated soil amendment with digestate increased significantly soil capacity to support plant biomass production as compared to unamended control in both the years. Findings supported evidence that this increase was principally attributable to a higher natural ability of digestate-amended soils to reduce root infection by saprophytic soil-borne pathogens whose inoculum was increased by the recurrent maize cultivation. Pseudomonas and actinomycetes were always more abundant in digestate-amended soils suggesting that both these large bacterial groups were involved in the increase of their natural capacity to control soil-borne pathogens (soil suppressiveness).

scholarly journals Influence of sodium lignosulfonate on loamy soil and cucumber plants

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Maria Yurkevich ◽  
Elena Ikkonen
Keyword(s):  
Plant Biomass ◽  
Water Soluble ◽  
Cucumber Plant ◽  
Plant Tolerance ◽  
Sodium Lignosulfonate ◽  
Buffer Solution ◽  
Model Soil ◽  
Inhibition Of Growth ◽  
Exchange Cations ◽  
Loam Soil

Sodium lignosulfonate is a water-soluble by-product obtained by the sulfite method of cellulose production. In a model experiment, the authors investigated the effect of sodium lignosulfonate on certain agrochemical parameters of sod-podzolic loam soil and on the physiological parameters of cucumber plant development. Sodium lignosulfonate was added to the soil in concentrations 0 %, 1 %, 2,5 %, 5 % and 10 % of the dry soil weight. The samples were incubated at a constant temperature (23 °С) and a constant humidity of 70 % for 90 days. Adding lignosulfanate to the model soil in small concentrations (1 and 2.5 %) significantly increased the content of potassium (from 169.7 mg/kg in the control to 389.1–431.6 mg/kg, respectively) and exchange cations, but reduced the nitrogen content regardless of the dose. The concentration of Mg, CA and Na increased by 3.9…7.8 times, which had an alkalizing effect on the soil. At a concentration of 2.5 % lignosulfonate, the pH of the salt solution increased by 1.26 units. At the same time, the concentration of the buffer solution significantly increased, which was manifested in the physiological response of plants. Lignosulfonate reduced the accumulation of plant biomass and proportion of roots in the total mass. With an increase in the concentration of lignosulfonate in the soil, the degree of inhibition of growth processes increased. Lignosulfanate did not affect the stomatal regime of leaves and transpiration losses of water, but it reduced the water content in the leaf depending on the concentration. Photosynthetic activity of plants was partially suppressed in conditions of high lignosulfonate content in the soil. Lignosulfonate did not enhance plant tolerance to low temperature.

scholarly journals Promotion of growth and metal accumulation of alfalfa by coinoculation with Sinorhizobium and Agrobacterium under copper and zinc stress

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6875 ◽  
Author(s):  
Liru Jian ◽  
Xiaoli Bai ◽  
Hui Zhang ◽  
Xiuyong Song ◽  
Zhefei Li
Keyword(s):  
Agrobacterium Tumefaciens ◽  
Plant Growth ◽  
Contaminated Soils ◽  
Sinorhizobium Meliloti ◽  
Plant Biomass ◽  
Antioxidant Activities ◽  
Synergistic Effects ◽  
Medicago Lupulina ◽  
Nitrogenase Activities ◽  
Zn Stress

The Legume-Rhizobium symbiosis has been proposed as a promising technique for the phytoremediation of contaminated soils due to its beneficial activity in symbiotic nitrogen fixation. However, numerous studies have shown that excessive heavy metals reduce the efficiency of symbiotic nodulation with Rhizobium and inhibit plant growth. In this study, we aimed to evaluate the synergistic effects of IAA-producing bacteria and Rhizobium on Medicago lupulina growth under Cu and Zn stress. Pot experiments showed that 400 mg kg−1 Cu2 + and Zn2 + greatly inhibited plant growth, but dual inoculation of Medicago lupulina with Sinorhizobium meliloti CCNWSX0020 and Agrobacterium tumefaciens CCNWGS0286 significantly increased the number of nodules and plant biomass by enhancing antioxidant activities. Under double stress of 400 mg kg−1 Cu2 + and Zn2 +, the nodule number and nitrogenase activities of dual-inoculated plants were 48.5% and 154.4% higher, respectively, than those of plants inoculated with Sinorhizobium meliloti. The root and above-ground portion lengths of the dual-inoculated plants were 32.6% and 14.1% greater, respectively, than those of the control, while the root and above-ground portion dry weights were 34.3% and 32.2% greater, respectively, than those of the control. Compared with S. meliloti and A. tumefaciens single inoculation, coinoculation increased total Cu uptake by 39.1% and 47.5% and increased total Zn uptake by 35.4% and 44.2%, respectively, under double metal stress conditions. Therefore, coinoculation with Sinorhizobium meliloti and Agrobacterium tumefaciens enhances metal phytoextraction by increasing plant growth and antioxidant activities under Cu/Zn stress, which provides a new approach for bioremediation in heavy metal-contaminated soil.

scholarly journals Effect of Native American Bean-corn Biculture Planting on Free-living Bacterial Abundance and Plant Growth

2015 ◽  
Vol 12 (4) ◽  
Author(s):  
Heather Miller ◽  
Justin Fiene ◽  
Tamara Marsh
Keyword(s):  
Native American ◽  
Plant Growth ◽  
Plant Biomass ◽  
Plant Growth Promoting Bacteria ◽  
Nitrogen Fixing ◽  
Nitrogen Fixing Bacteria ◽  
Free Living ◽  
Soil Microbial ◽  
Plant Growth Promoting ◽  
Native American Tribes

Native American tribes with bountiful harvests. Today it is widely recognized that this associated intercropping system derives much of its success from symbiotic bacteria (e.g. Rhizobium). These bacteria colonize the roots of leguminous plants, allowing them to fix atmospheric nitrogen into ammonia. However, the effect of this intercropping practice on the microbial community, independent of the effect of the symbiotic nitrogen-fixing bacteria, is not well understood. Therefore, a study was designed to model the effects of simultaneously intercropping bean and corn on the abundance of aerobic heterotrophic, free-living nitrogen-fixing, and symbiotic nitrogen-fixing bacteria, as well as plant growth and fecundity markers. In parallel, the benefits mediated by rhizobia were evaluated by inoculating a duplicate set of treatments with N-Dure, a rhizobia-containing inoculum. Native American varieties of pole-bean (Phaseolus vulgaris L.) and corn (Zea mays mays L.) were planted in monoculture and biculture treatments. All cultivations were maintained under greenhouse conditions for 52 days with daily watering and no additional fertilizer or microbial amendments. Although a significant increase in weight per plant was noted for the inoculated biculture when compared to either the inoculated bean or corn monocultures (p ≤ 0.05), the abundance of heterotrophic and free-living nitrogen-fixing bacteria did not show a significant change from the related controls, with or without inoculation. However, symbiotic nitrogen-fixing bacteria, as measured by root nodulation, increased significantly (p ≤ 0.05) for the inoculated biculture and single planting. Thus, these data confirm that corn benefited from this associated intercropping system as shown by an increase in plant biomass that can be attributed to Rhizobium. However, neither the legume-bacteria symbiotic relationship nor the increase in plant biodiversity resulting from this intercropping practice appears to have had significant effects on the abundance of the two common soil-associated bacterial groups evaluated, though further research would be necessary to fully assess the changes to heterotrophic bacterial diversity at the species level. KEYWORDS: Three Sisters; Nitrogen-fixing Bacteria; Inoculation with Rhizobia; Plant Growth Promoting Bacteria; Soil Microbial Biota; Corn and Bean Simultaneous Planting.

scholarly journals Impacts of Porous Silica-Nanoencapsulated Pesticide Applied to Soil on Plant Growth and Soil Microbial Community

2021 ◽  
Author(s):  
Vinicius Bueno ◽  
Peiying Wang ◽  
Orfeo Harrisson ◽  
Stephane Bayen ◽  
Subhasis Ghoshal
Keyword(s):  
Microbial Community ◽  
Plant Growth ◽  
Soil Microbial Community ◽  
Plant Biomass ◽  
Porous Silica ◽  
Healthy Plant ◽  
Agricultural Crop ◽  
Soil Microbial ◽  
Total Uptake ◽  
Pesticide Treatment

Porous silica nanocarriers have the potential to improve agricultural crop productivity. However, the impacts of nanoencapsulated pesticides on soil health and plant growth, and how they compare with conventional pesticide have not been systematically elucidated. In this study, we investigated how applying azoxystrobin encapsulated in porous hollow SiO2 nanocarriers to agricultural soil impacted the soil microbial community and plant development, using Solanum lycopersicum grown in the laboratory in soil microcosms. The data show that plant growth was heavily inhibited by the non-encapsulated pesticide treatment compared to that with encapsulated pesticide yielding 3.85-fold less plant biomass, while the soil microbial community experienced few to no changes regardless of the treatment. There was a 2.7-fold higher azoxystrobin uptake per unit dry plant biomass after 10 days of exposure for the non-encapsulated pesticide treatment when compared to that of nanoencapsulated pesticide, but only 1.5-fold increase in total uptake. After 20 days of exposure, however, the total uptake and uptake per unit of dry biomass were 3-fold and 10-fold higher, respectively, for the nanopesticide treatment. The differences in uptake can be attributed to phytotoxicity caused by the high the bioavailability of the non-encapsulated pesticide. The nanocarrier promoted slow release of the pesticide over days, which prevented phytotoxicity, and allowed healthy plant growth.

scholarly journals CHANGES IN C : N : Р RATIOS IN PLANT BIOMASS, SOIL AND SOIL MICROBIAL BIOMASS DUE TO THE WARMING AND DESSICATION EFFECT OF FLARING

2018 ◽  
pp. 71-89 ◽  
Author(s):  
D. M. Dudareva ◽  
A. K. Kvitkina ◽  
I. A. Yusupov ◽  
I. V. Yevdokimov
Keyword(s):  
Microbial Biomass ◽  
Soil Microbial Biomass ◽  
Plant Biomass ◽  
Abiotic Factors ◽  
Methodological Approach ◽  
Terrestrial Ecosystems ◽  
Water Soluble ◽  
Oil Well ◽  
Soil Microbial ◽  
Stoichiometric Ratios

Climate warming results in significant changes in the structure and functioning of terrestrial ecosystems. The ecosystems situated near oil-well gas flares may be used as model ones for studying warming effect on soil and vegetation. By contrast to regular manipulation experiments where ecopysiological factors are modified or controlled artificially, we used anthropogenically affected condi-tions caused by the gas flaring. Our research was aimed to assess the warming and desiccation effect on the stoichiometric ratios of the principle nutrients (C : N : P) in pine phytomass, soil and soil microbial biomass. Soil organic matter (SOM) and dying microbial biomass were found to be exposed to the increased rate of mineralization under conditions of the abiotic stress. In addition, the de-crease of relative С content in sustainable SOM pools occured along with the increase of C content in the most labile water-soluble pools. Accelerated SOM mineralization decreasing C : N with respect to phosphorus ratio in soil and soil microbial biomass was sufficiently intensified by the decrease in C : N : P in pine needles. Thus, studying changes in stoichiometric ratios of biophylic ele-ments as affected by abiotic factors seems to be prospective and promising methodological approach for predicting terrestrial ecosystem transformations under global climate changes.

scholarly journals Dynamics of Soil Microbial Population and Enzymes Activities under Distillery Spentwash Irrigation

2019 ◽  
pp. 1-8
Author(s):  
Karthika Vadivel ◽  
G. Rajannan ◽  
S. Avudainayagam
Keyword(s):  
Field Experiment ◽  
Microbial Population ◽  
Block Design ◽  
Growth Period ◽  
Recommended Dose ◽  
Treatment Schedule ◽  
Soil Enzymatic Activity ◽  
Soil Microbial ◽  
Distillery Spentwash ◽  
Soil Microbial Population

Spentwash is a rich source of organic matter and nutrients like nitrogen, phosphorus, potassium, calcium and sulphur. The effect of different levels and methods of spentwash application on soil enzymatic activity was examined through a field experiment. The field experiment was conducted using Sesame VRI (Sv) 2 as a test crop at Research and Development Farm, The Sakthi Sugars Pvt. Ltd., Appakkudal, Erode District. The experiment was formulated with six treatments with four replications, laid out in Randomised Block design. As per the treatment schedule the calculated quantity of biomethanated distillery spentwash for pre-sown application was uniformly applied to the plots before sowing viz., 25, 50, 75,100% along with recommended dose of NP for four treatments viz., 100%, 75%, 50%, 25% and Recommended dose NPK was treated as one treatment (control).The soil samples were collected at 30 days intervals and analysed for the changes in soil microbial population and enzyme activities. The results of the study showed that the microbial population and enzymatic activities of the soil were substantially increased throughout the crop growth period due to biomethanated distillery spentwash application.

scholarly journals Delivery of Inoculum of Rhizophagus irregularis via Seed Coating in Combination with Pseudomonas libanensis for Cowpea Production

Agronomy ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 33 ◽  
Author(s):  
Ying Ma ◽  
Aleš Látr ◽  
Inês Rocha ◽  
Helena Freitas ◽  
Miroslav Vosátka ◽  
...  
Keyword(s):  
Plant Growth ◽  
Seed Yield ◽  
Precision Agriculture ◽  
Mycorrhizal Fungi ◽  
Large Scale ◽  
Plant Biomass ◽  
Rhizophagus Irregularis ◽  
Plant Growth Promoting Bacteria ◽  
Seed Coating ◽  
Plant Tolerance

Cowpea (Vigna unguiculata L. Walp) is an important legume grown primarily in semi-arid area. Its production is generally inhibited by various abiotic and biotic stresses. The use of beneficial microorganisms (e.g., plant growth promoting bacteria (PGPB) and arbuscular mycorrhizal fungi (AMF)) can enhance agricultural production, as these microorganisms can improve soil fertility and plant tolerance to environmental stresses, thus enhancing crop yield in an eco-friendly manner. Application of PGPB and AMF in large scale agriculture needs to be improved. Thus, the use of seed coating could be an efficient mechanism for placement of inocula into soils. The aim of this study was to evaluate the effects of the AMF Rhizophagus irregularis BEG140 and the PGPB Pseudomonas libanensis TR1 alone or in combination on the biomass and physiological traits of cowpea. Four treatments were set: (i) non-inoculated control; (ii) PGPB; (iii) AMF applied via seed coating; and (iv) PGPB + AMF applied via seed coating. Cowpea plants inoculated via seed coating with R. irregularis and those inoculated with R. irregularis + P. libanensis showed root mycorrhizal colonization of 21.7% and 24.2%, respectively. PGPB P. libanensis was efficient in enhancing plant biomass and seed yield. There was no benefit of single (AMF) or dual (PGPB + AMF) inoculation on plant growth or seed yield. The application of beneficial soil microorganisms can be a viable approach for sustainable cowpea production in precision agriculture scenarios.

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