The sorption and degradation of the rice pesticides fipronil and thiobencarb on two Australian rice soils

Soil Research ◽  
2006 ◽  
Vol 44 (6) ◽  
pp. 599 ◽  
Author(s):  
Gregory Doran ◽  
Philip Eberbach ◽  
Stuart Helliwell
Keyword(s):  
Organic Carbon ◽  
Absolute Amount ◽  
Anaerobic Conditions ◽  
Rice Soils ◽  
Aerobic Conditions ◽  
Soil Microbial ◽  
Layer Analysis ◽  
Lag Period ◽  
The Difference ◽  
Soil Microbial Population

The sorption and degradation of the rice pesticides fipronil and thiobencarb on 2 Australian rice-growing soils were investigated. Greater sorption of both pesticides occurred on the soil containing less organic carbon, possibly as a result of the type of organic carbon present, rather than the absolute amount. While sorption tended to appear greater in the 0–10 mm layer than the 10–20 mm layer, analysis showed the difference was not significant (P > 0.05). Under aerobic conditions, a lag period of 20 days in the degradation of thiobencarb occurred on the Yanco soil, but rapid degradation occurred on the Coleambally soil, and, while unlikely, may have been a consequence of preconditioning of the Coleambally soil microbial population. Degradation of thiobencarb under both non-flooded anaerobic and flooded anaerobic conditions differed significantly (P < 0.05) compared to aerobic conditions. Conversely, fipronil degraded rapidly over the first few days and then slowed, and was attributed to the co-metabolism of fipronil by soil microbes. While fipronil sulfide was produced under all oxic/anoxic conditions, its concentration was greatest under flooded anaerobic conditions, possibly as a result of greater exclusion of oxygen from the soil by the floodwater.

scholarly journals Conservation Practice, Irrigation and Fertilizer Dose Influence Yield and Quality of Mango cv. Amrapali under High Density Orchard in Kosi Zone of Bihar

2019 ◽  
pp. 1-6
Author(s):  
Radhey Shyam ◽  
Suraj Prakash ◽  
Janardan Prasad
Keyword(s):  
Organic Carbon ◽  
Microbial Population ◽  
Fruit Yield ◽  
Conservation Practices ◽  
Soil N ◽  
Conservation Practice ◽  
Soil P ◽  
Soil Microbial ◽  
Conservation Treatment ◽  
Soil Microbial Population

An investigation was carried out during three consecutive years from 2016-17 to 2018-19 at farm of B.P.S. Agricultural college, Purnea on Mango cv. Amrapali to study the effect of conservation practice of mulch with irrigation and fertilizer levels on yield and soil parameter, fruit yield and its qualities of mango grown in kosi zone of Bihar. The experiment was laid out in split split plot design with three replications. Experimental findings revealed that conservation practices as mulch significantly increased fruit set, fruit retention, fruit yield and fruit quality. Among different irrigation levels and fertilizer doses maximum fruit yield (23.24 ton/ha) was obtained under conservation practice with 75% recommended irrigation along with 100% RDF which was at par with conservation practice with 75% recommended irrigation along with 75% RDF. Conservation treatment also showed maximum TSS (23.69° Brix) with maximum (0.39%) acidity of fruit. Observations also revealed that conservation practices as mulching significantly increased the soil moisture content, organic carbon %, available soil N, P and K, along with increase soil microbial population. Among the different fertilizer levels highest organic carbon %, available soil N, P and K, as well as soil microbial population were observed with 100% RDF, however only organic carbon and available soil P were at par with 75% RDF.

Biodegradation of household chemicals in river water under untreated discharge conditions

2000 ◽  
Vol 42 (7-8) ◽  
pp. 377-382 ◽  
Author(s):  
C.-G. Peng ◽  
T. Arakaki ◽  
K. Jung ◽  
E. Namkung
Keyword(s):  
River Water ◽  
Decay Rates ◽  
Strictly Anaerobic ◽  
Anaerobic Conditions ◽  
Aerobic Conditions ◽  
Untreated Sewage ◽  
Additional Testing ◽  
Lag Period ◽  
Low Levels ◽  
Household Chemicals

A series of batch die-away tests was conducted to evaluate the decay rates of MBAS and COD under conditions simulating untreated discharge. Under aerobic conditions, decay of MBAS was consistently faster than that of COD, and dilution into river water had no effect on either rate. Under strictly anaerobic conditions, neither MBAS nor COD decreased in concentration. Additional testing examined the fate of 14C-LAS and the results showed that LAS disappeared and was mineralized after a lag period. Half-lives were 8–10 hours for loss of parent and 11–12 hours for mineralization. Addition of 14C-LAS in sewage to systems previously exposed to raw sewage resulted in no lag and shorter half-lives. This work indicates that MBAS and LAS degrade more rapidly than COD, suggesting these materials would be at low levels once a stream had recovered from the addition of untreated sewage.

scholarly journals Comparing the effect of biological amendments and chemical fertilizer on bacterial and fungal population

2021 ◽  
pp. 10-15
Author(s):  
Edosa V.I.O. ◽  
Aleladia B.O. ◽  
Osarhiemen V. O.
Keyword(s):  
Organic Carbon ◽  
Positive Control ◽  
Negative Control ◽  
Chemical Fertilizer ◽  
Growth And Yield ◽  
Rumen Content ◽  
Anaerobic Digestate ◽  
Soil Microbial ◽  
Randomized Design ◽  
Soil Microbial Population

Amelioration of degraded soils has triggered interest regarding alternatives to supply nutrient and improve microbial diversity through the integrated use of organic manure and biofertilizers. In this light, a screenhouse experiment set in a completely randomized design (CRD) with seven (7) treatments; Bacillus thuringiensis (5 ml); digestate (22.4 t ha-1); 50% of digestate + NPK 15:15:15 (11.2 & 3.1 t ha-1); Digestate + B. thuringiensis (22.4 t ha-1 & 5 ml); Digestate + B. thuringiensis + Glomus mosseae 22.4 t ha-1, 5 ml & 500 g); positive control (NPK 15:15:15) and negative control with no treatment, replicated three (3) times was done. This research was carried out in the screen house of the department of soil science and land management, Faculty of Agriculture, University of Benin, with the aim of evaluating the agronomic value of anaerobic digestate (derived from cattle rumen content waste), inoculants of B. thuringiensis and G. mosseae in comparison with chemical fertilizer (NPK 15:15:15), while determining its’ effect on soil microbial properties, growth and yield of tomato. The results showed that application of NPK 15:15:15 at a rate of 6.1 t ha-1 caused a significant decrease in number of leaves of the tomato plant with a total of 50 and 56 leaves/plant in pots treated with NPK 15:15:15, and a combination of digestate and NPK respectively at 8 WAT. At 8 WAT, total organic carbon of the soil was best improved in soil with a treatment of digestate, bacteria and mycorrhiza inoculum (61%), and was also significantly improved in the positive control (63%), with the pots with no treatments having the least amount of organic carbon (1.8%). Total nitrogen was highest in treatments of digestate and both inoculums at 5.7% and least in soils with a combination of digestate and NPK 15:15:15 (0.3%). Soil microbial population of bacteria and fungi increased by 20% and 43% respectively. These findings indicate that a combination of anaerobic digestate, B. thuringiensis and G. mosseae applied at 22.4 t ha -1, 5 ml and 500 g respectively is best suited for tomato cultivation and is recommended for optimum growth and yield of tomato in the study area.

scholarly journals BACTERIAL CELL METABOLISM UNDER ANAEROBIC CONDITIONS

1934 ◽  
Vol 17 (3) ◽  
pp. 349-357 ◽  
Author(s):  
H. H. Walker ◽  
C.-E. A. Winslow ◽  
M. Grace Mooney
Keyword(s):  
Metabolic Activity ◽  
Cell Metabolism ◽  
Distinct Type ◽  
Water Medium ◽  
Anaerobic Conditions ◽  
Aerobic Conditions ◽  
Peptone Water ◽  
A Cell ◽  
Lag Period ◽  
Peptone Medium

Escherichia coli has been cultivated in a peptone water medium saturated continuously with nitrogen by use of a gas train so as to produce anaerobic conditions. Under these circumstances growth was greatly inhibited. Cultures which originally contained 11 million bacteria per cc. showed on the average only 32 million after 5 hours (as compared with 655 million in similar cultures saturated with air). The metabolic activity of the cells in such a culture was greatly reduced by the anaerobic conditions. It actually fell off from 42 mg. x 10–11 per cell per hour during the 1st hour to 27 mg. during the 2nd hour and rose only to a maximum of 68 during the 3rd hour. Similar cultures saturated with air showed a rise from 37 mg. x 10–11 during the 1st hour to 123 during the 2nd hour. The addition of glucose to the medium, under aerobic conditions, has been shown in previous studies to cause only a slight increase in bacterial numbers (861 instead of 655 million after the 5th hour). In the cultures aerated with nitrogen, the addition of glucose has no effect during the first hours. There is again a long lag period and a reduced metabolic rate. After the 2nd hour, however, a wholly different phenomenon manifests itself. The bacterial population increases more rapidly than in the anaerobic peptone medium (reaching a maximum of 142 million after 5 hours). This growth is accompanied by an enormous increase in the rate of CO2 yield, which reaches 211 mg. x 10–11 per cell per hour during the 4th hour (nearly double the maximum values recorded under aerobic conditions). The same phenomenon is, of course, illustrated by the enormous yield of CO2 produced by the action of fermenting organisms in carbohydrate media recorded by Anderson (1924) and other students of the obligate anaerobes. We have here, however, a somewhat striking illustration of the distinct type of metabolic activity manifested by a facultative organism under anaerobic conditions in the presence of sugar measured on a cell-per-hour basis. This is a quantitative illustration of the "life without air" described by Pasteur.

INFLUENCE OF ORGANIC MANURE AND WOOD ASH ON THE ABUNDANCE OF SOIL MICROORGANISMS, ORGANIC CARBON AND GRAIN YIELD OF SOYBEAN (GLYCINE MAX L. MERRILL) IN ACID SOIL

2019 ◽  
Vol 18 (1) ◽  
pp. 87-96
Author(s):  
A. A. OLUBODE ◽  
A. SORETIRE ◽  
N. O. ADEYEMI
Keyword(s):  
Organic Carbon ◽  
Soil Amendment ◽  
Soil Microorganisms ◽  
Microbial Population ◽  
Acid Soil ◽  
Wood Ash ◽  
Organic Manure ◽  
Cow Dung ◽  
Soil Microbial ◽  
Soil Microbial Population

Organic production methods which include the exclusion of chemical approach of soil amendment have been observed to improve plant growth and preserve the soil health and biodiversity of production environment. A study was conducted at the Federal University of Agriculture, Abeokuta, to examine the influence of organic manure and wood ash on the abundance of soil microorganisms, organic carbon and yield of soybean in acid soil. The study consisted of three rates of wood ash (0, 2.5 and 5.0 t ha-1) and three rates of cow dung (0, 5.0 and 10.0 t ha-1) arranged in completely randomized design, replicated three times. Soybean variety TGX 1485 – ID was sown into 5 kg. The results showed that wood ash application at 5.0 t ha-1 significantly increased the soil pH (6.6), organic carbon (7.48) and soil microbial population (110 × 104 cfu g-1) compared to lower rate of 2.5 t ha-1 and control, which resulted in highest number of pods (7.7) and grain yield (14.2 g per plant) at harvest. Cow dung treatment of 10 t ha-1 significantly had highest soil organic carbon (7.39%) at 8 WAP and soil microbial population (21.1 and 91.4 × 104 cfu g-1) at 4 and 8 WAP respectively. These findings indicate that application of wood ash may be an acceptable alternative liming agent to the inorganic soil amendment and higher soybean productivity.    

The Reaction of Thiol Compounds with the Vitamin-K Dependent Clotting Factors

1969 ◽  
Vol 21 (03) ◽  
pp. 573-579 ◽  
Author(s):  
P Fantl
Keyword(s):  
Prothrombin Time ◽  
Vitamin K ◽  
Anaerobic Conditions ◽  
Clotting Factors ◽  
Thiol Compounds ◽  
Aerobic Conditions ◽  
One Stage ◽  
Factor Ii ◽  
Ph Dependent ◽  
The One

SummaryTreatment of human and dog oxalated plasma with 0.2 to 1.0 × 10−1 M 2.3-dithiopropanol (BAL) or dithiothreitol (DTT) at 2–4° C for 30 min results in the reduction of the vitamin-K dependent clotting factors II, VII, IX and X to the respective-SH derivatives. The reaction is pH dependent. Under aerobic conditions the delayed one stage prothrombin time can be partly reversed. Under anaerobic conditions a gradual prolongation of the one stage prothrombin time occurs without reversal.In very diluted plasma treated with the dithiols, prothrombin can be converted into thrombin if serum as source of active factors VII and X is added. In contrast SH factors VII, IX and X are inactive in the specific tests. Reoxidation to active factors II, VII, IX and X takes place during adsorption and elution of the SH derivatives. The experiments have indicated that not only factor II but also factors VII, IX and X have active-S-S-centres.

scholarly journals From the Ground Up: Prairies on Reclaimed Mine Land—Impacts on Soil and Vegetation

Land ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 455
Author(s):  
Rebecca M. Swab ◽  
Nicola Lorenz ◽  
Nathan R. Lee ◽  
Steven W. Culman ◽  
Richard P. Dick
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Properties ◽  
Plant Community ◽  
Prairie Restoration ◽  
Native Plant ◽  
Soil Microbial ◽  
Prairie Restorations ◽  
Mine Lands ◽  
The Impact

After strip mining, soils typically suffer from compaction, low nutrient availability, loss of soil organic carbon, and a compromised soil microbial community. Prairie restorations can improve ecosystem services on former agricultural lands, but prairie restorations on mine lands are relatively under-studied. This study investigated the impact of prairie restoration on mine lands, focusing on the plant community and soil properties. In southeast Ohio, 305 ha within a ~2000 ha area of former mine land was converted to native prairie through herbicide and planting between 1999–2016. Soil and vegetation sampling occurred from 2016–2018. Plant community composition shifted with prairie age, with highest native cover in the oldest prairie areas. Prairie plants were more abundant in older prairies. The oldest prairies had significantly more soil fungal biomass and higher soil microbial biomass. However, many soil properties (e.g., soil nutrients, β-glucosoidase activity, and soil organic carbon), as well as plant species diversity and richness trended higher in prairies, but were not significantly different from baseline cool-season grasslands. Overall, restoration with prairie plant communities slowly shifted soil properties, but mining disturbance was still the most significant driver in controlling soil properties. Prairie restoration on reclaimed mine land was effective in establishing a native plant community, with the associated ecosystem benefits.

scholarly journals Poplar-Assisted Bioremediation for Recovering a PCB and Heavy-Metal-Contaminated Area

Agriculture ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 689
Author(s):  
Valeria Ancona ◽  
Ida Rascio ◽  
Giorgia Aimola ◽  
Claudia Campanale ◽  
Paola Grenni ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Southern Italy ◽  
Organic Carbon Content ◽  
Contaminant Removal ◽  
Soil Microbial ◽  
Treated Area ◽  
Legal Limits ◽  
Bacterial Groups ◽  
Contaminated Area ◽  
Stimulation Of

A Monviso clone has been applied to promote PCB degradation in a soil historically contaminated by polychlorinated biphenyls (PCBs) and heavy metals (HMs). The multi-contaminated area is located in Southern Italy. PCBs, HMs, and the soil microbial community (abundance, viability, and structure) were analysed in selected plots of the poplar-treated area. At 900 days after poplar planting, chemical analyses showed that PCBs and most of HMs diminished under the Italian legal limits. The overall results suggest that the poplar clone was effective in promoting PCB rhizodegradation and HM phytostabilization. Organic carbon content increased strongly in the rhizosphere of the planted plots. Microbiological results highlighted an overall increase in microbial abundance, cell viability, and the presence of bacterial groups involved in PCB degradation. The poplar-based bioremediation technology is a nature-based solution able to promote the recovery of soil quality in terms of contaminant removal, increase in organic carbon, and stimulation of autochthonous bacterial groups able to transform PCBs.

scholarly journals Impact of soil use on aggregate stability and its relationship with soil organic carbon at two different altitudes in the Colombian Andes

2019 ◽  
Vol 37 (3) ◽  
pp. 263-273
Author(s):  
Efraín Francisco Visconti-Moreno ◽  
Ibonne Geaneth Valenzuela-Balcázar
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Aggregate Stability ◽  
Tropical Climate ◽  
Mineral Particle ◽  
Organic Carbon Content ◽  
Rice Soils ◽  
Organic Matter Pool ◽  
Different Altitudes

The stability of soil aggregates depends on the organic matter, and the soil use and management can affect the soil organicmatter (SOM) content. Therefore, it is necessary to know therelationship between aggregate stability and the content of SOMin different types of soil use at two different altitudes of theColombian Andes. This study examined the conditions of soilaggregate stability expressed as a distribution of the size classes of stable aggregates (SA) and of the mean weighted diameter of the stable aggregates (MWD). To correlate these characteristics with the soil organic carbon (OC), we measured the particulate organic matter pool (POC), the OC associated with the mineral organic matter pool (HOC), the total organic carbon content (TOC), and the humification rate (HR). Soils were sampled at two altitudes: 1) Humic Dystrudepts in a cold tropical climate (CC) with three plots: tropical mountain rainforest, pastures, and crops; 2) Fluvaquentic Dystrudepts in a warm tropical climate (WC) with three plots: tropical rainforest, an association of oil palm and pastures, and irrigated rice. Soils were sampled at three depths: 0-5, 5-10 and 10-20 cm. The physical properties, mineral particle size distribution, and bulk density were measured. The content of SA with size>2.36 mm was higher in the CC soil (51.48%) than in the WC soil (9.23%). The SA with size 1.18-2.36 mm was also higher in the CC soil (7.78%) than in the WC soil (0.62%). The SA with size 0.60-1.18 mm resulted indifferent. The SA with size between 0.30 and 0.60 mm were higher in the WC soil (13.95%) than in the CC soil (4.67%). The SA<0.30 mm was higher in the WC soil (72.56%) than in the CC soil (32.15%). It was observed that MWD and the SA>2.36 mm increased linearly with a higher POC, but decreased linearly with a higher HR. For the SA<0.30 mm, a linear decrease was observed at a higher POC, while it increased at a higher HR.

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