scholarly journals Environmental Effects and Management Strategies of the Herbicides

2020 ◽  
Vol 11 (6) ◽  
pp. 518-535
Author(s):  
Sayantani Basu ◽  
◽  
Y. Vasudeva Rao ◽  
Keyword(s):  
Organic Matter ◽  
Management Practices ◽  
Negative Impact ◽  
Biological Control Agent ◽  
Cropping Systems ◽  
Evaluation Studies ◽  
Organic Matter Content ◽  
Matter Content ◽  
Management Procedure ◽  
Wide Range

India has wide range of agro-climates and soil types and highly diverse agriculture farming systems with different types of weed problems. So, herbicides are the integrated part of the general cropping systems. In general, herbicides are formulated in such a way that they degrade from the environment after completion of their intended work, but a few of them persist in the environment and cause a serious hazard to the succeeding crop and also to the surrounding environments. Hence, a proper knowledge of herbicides is important to understand the management procedure, organization and hierarchy of the herbicides. It also provides an imminent idea to herbicide resistance, which continues to be a problem in sustainable agricultural management. In this review, the herbicides used in India, negative impact of herbicides on the environment, persistency of herbicides, their dissipation methods and different management practices to avoid/minimize herbicide carry-over effects were discussed. The combine effects of bioaugmentation and biostimulation along with organic matter addition might be a promising technology to accelerate the biodegradation. Apart from these, extensive field evaluation studies with other tools like crop rotation and increment of the organic matter content is definitely a promising technique for managing the herbicide persistence. Bioherbicides, a biological control agent for weeds, and transgenic approaches can be a good alternative for chemical herbicides in future. They provide high degree of specificity of target weed and have no effect on non-target, beneficial plants or man and do not form any residues in the environment.

Log landings are methane emission hotspots in managed forests

2021 ◽  
Author(s):  
Juliana Vantellingen ◽  
Sean C. Thomas
Keyword(s):  
Organic Matter ◽  
Soil Properties ◽  
Management Practices ◽  
Emission Rate ◽  
Woody Debris ◽  
Organic Matter Content ◽  
Growing Season ◽  
Matter Content ◽  
Emission Rates ◽  
Managed Forests

Log landings are areas within managed forests used to process and store felled trees prior to transport. Through their construction and use soil is removed or redistributed, compacted, and organic matter contents may be increased by incorporation of wood fragments. The effects of these changes to soil properties on methane (CH<sub>4</sub>) flux is unclear and unstudied. We quantified CH<sub>4</sub> flux rates from year-old landings in Ontario, Canada, and examined spatial variability and relationships to soil properties within these sites. Landings emitted CH<sub>4</sub> throughout the growing season; the average CH<sub>4</sub> emission rate from log landings was 69.2 ± 12.8 nmol m<sup>-2</sup> s<sup>-1</sup> (26.2 ± 4.8 g CH<sub>4</sub> C m<sup>-2</sup> y<sup>-1</sup>), a rate comparable to CH<sub>4</sub>-emitting wetlands. Emission rates were correlated to soil pH, organic matter content and quantities of buried woody debris. These properties led to strong CH<sub>4</sub> emissions, or “hotspots”, in certain areas of landings, particularly where processing of logs occurred and incorporated woody debris into the soil. At the forest level, emissions from landings were estimated to offset ~12% of CH<sub>4</sub> consumption from soils within the harvest area, although making up only ~0.5% of the harvest area. Management practices to avoid or remediate these emissions should be developed as a priority measure in “climate-smart” forestry.

scholarly journals Effects of Adding Organic Matter to a Red-Yellow Latosol in the Sorption and Desorption of Tebuthiuron

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
M.F.F. TEIXEIRA ◽  
A.A. SILVA ◽  
M.A. NASCIMENTO ◽  
L.S. VIEIRA ◽  
T.P.M TEIXEIRA ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Organic Matter ◽  
Liquid Chromatography ◽  
High Performance ◽  
Cropping Systems ◽  
Organic Matter Content ◽  
Matter Content ◽  
Inverse Relation ◽  
Direct Relation ◽  
Soil Attributes

ABSTRACT: Tebuthiuron is one of the most widely used herbicides in the sugarcane culture and its characteristic is the long persistence in soil. When used without knowing its interactions with soil attributes, it can reduce the sustainability of cropping systems and contaminate surface and groundwaters. In this research, by using a high-performance liquid chromatography, the effects of adding organic matter in a Red-Yellow Latosol were evaluated, as for the sorption and desorption of tebuthiuron. It was concluded that there is a direct relation between the sorption of tebuthiuron and the organic matter content in Red-Yellow Latosols and there is an inverse relation for desorption. The hysteresis index was lower in samples with high organic matter content.

scholarly journals Soil structure after 18 years of long-term different tillage systems and fertilisation in Haplic Luvisol

2018 ◽  
Vol 13 (No. 3) ◽  
pp. 140-149 ◽  
Author(s):  
Šimanský Vladimír ◽  
Lukáč Martin
Keyword(s):  
Organic Matter ◽  
Soil Structure ◽  
Management Practices ◽  
Crop Residues ◽  
Organic Matter Content ◽  
Matter Content ◽  
Soil Tillage ◽  
Arable Soils ◽  
Water Stable Aggregates

Soil structure is a key determinant of many soil environmental processes and is essential for supporting terrestrial ecosystem productivity. Management of arable soils plays a significant role in forming and maintaining their structure. Between 1994 and 2011, we studied the influence of soil tillage and fertilisation regimes on the stability of soil structure of loamy Haplic Luvisol in a replicated long-term field experiment in the Dolná Malanta locality (Slovakia). Soil samples were repeatedly collected from plots exposed to the following treatments: conventional tillage (CT) and minimum tillage (MT) combined with conventional (NPK) and crop residue-enhanced fertilisation (CR+NPK). MT resulted in an increase of critical soil organic matter content (St) by 7% in comparison with CT. Addition of crop residues and NPK fertilisers significantly increased St values (by 7%) in comparison with NPK-only treatments. Soil tillage and fertilisation did not have any significant impact on other parameters of soil structure such as dry sieving mean weight diameters (MWD), mean weight diameter of water-stable aggregates (MWD<sub>WSA</sub>), vulnerability coefficient (Kv), stability index of water-stable aggregates (Sw), index of crusting (Ic), contents of water-stable macro- (WSA<sub>ma</sub>) and micro-aggregates (WSA<sub>mi</sub>). Ic was correlated with organic matter content in all combinations of treatments. Surprisingly, humus quality did not interact with soil management practices to affect soil structure parameters. Higher sums of base cations, CEC and base saturation (Bs) were linked to higher Sw values, however higher values of hydrolytic acidity (Ha) resulted in lower aggregate stability in CT treatments. Higher content of K<sup>+</sup> was responsible for higher values of MWD<sub>WSA </sub>and MWD in CT. In MT, contents of Ca<sup>2+</sup>, Mg<sup>2+ </sup>and Na<sup>+</sup> were significantly correlated with contents of WSA<sub>mi </sub>and WSA<sub>ma</sub>. Higher contents of Na<sup>+</sup> negatively affected St values and positive correlations were detected between Ca<sup>2+</sup>, Mg<sup>2+ </sup>and Na<sup>+</sup> and Ic in NPK treatments.

Relationship between soil composition and retention capacity of terbumeton onto chalky soils

2009 ◽  
Vol 6 (3) ◽  
pp. 245 ◽  
Author(s):  
Achouak El Arfaoui ◽  
Stéphanie Sayen ◽  
Eric Marceau ◽  
Lorenzo Stievano ◽  
Emmanuel Guillon ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Properties ◽  
Environmental Fate ◽  
Organic Matter Content ◽  
Calcareous Soils ◽  
Matter Content ◽  
Soil Composition ◽  
Retention Capacity ◽  
Wide Range ◽  
Soil Components

Environmental context. The wide use of pesticides for pest and weed control contributes to their presence in underground and surface waters, which has led to a continuously growing interest in their environmental fate. Soils play a key role in the transfer of these compounds from the sprayer to the water as a result of their capacity to retain pesticides depending on the soil components. The knowledge of soil composition should enable one to predict pesticide behaviour in the environment. Abstract. Eight calcareous soils of Champagne vineyards (France) were studied to investigate the adsorption of the herbicide terbumeton (TER). A preliminary characterisation of the soil samples using X-ray diffraction (XRD), elemental and textural analyses, revealed a wide range of soil properties for the selected samples. The adsorption isotherms of TER were plotted for all samples. The determination of soil properties, which significantly correlated with the Kd distribution coefficient, allowed identification of organic matter and CaCO3 as the two main soil components that govern the retention of the herbicide. Organic matter was the predominant phase involved in the retention but its role was limited by the presence of calcite. Finally, the ratio of CaCO3 content to organic matter content was proposed as a useful parameter to predict the adsorption of terbumeton in chalky soils. The evolution of Kd as a function of this ratio was successfully described using an empirical model.

Compaction of forest soils. A review

Soil Research ◽  
1980 ◽  
Vol 18 (2) ◽  
pp. 163 ◽  
Author(s):  
EL Greacen ◽  
R Sands
Keyword(s):  
Organic Matter ◽  
Forest Soils ◽  
Soil Compaction ◽  
Water Regime ◽  
Management Practices ◽  
Organic Matter Content ◽  
Matter Content ◽  
Predictive Tool ◽  
Soil Water Regime ◽  
Heavy Loads

The problem of soil compaction in forestry differs from that in agriculture because of differences in the nature of the crop, in particular the weight and size of the plant members and the length of time that they persist. The roots compact the soil as they increase in size, but they also transmit the weight of the tree and forces generated by the wind onto the soil. There are important differences in management practices; in forestry modern harvesting machines apply heavy loads and, for reasons of cost, tend to be kept in operation throughout the year. As a consequence the structure of the soil suffers some damage, often manifested as compaction. Compaction arising from such sources may reduce the growth of the current trees or trees subsequently planted on the site. But it is difficult to predict the extent of such reduction, if any, because of the complex of interactions involved. Important factors concerned, namely, the soil water regime and the organic matter content, are emphasized. A conceptual model is proposed as a predictive tool. The mechanics of soil compaction, the effects of compaction on the physical properties of the soil, and techniques for the prevention and amelioration of compaction of forest soils, are discussed.

scholarly journals The color of refractory organic carbon

2018 ◽  
Vol 189 (2) ◽  
pp. 9 ◽  
Author(s):  
Maxime Debret ◽  
Yoann Copard ◽  
Antonin Van Exem ◽  
Geneviève Bessereau ◽  
Frank Haeseler ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Carbon Content ◽  
Anthropogenic Activities ◽  
Organic Matter Content ◽  
Matter Content ◽  
Mineral Matter ◽  
Organic Carbon Content ◽  
Fast Method ◽  
Wide Range

Organic matter studies find an echo within different topics such as biogeochemical cycles, processes occurring in continental surfaces, anthropogenic activities, climate science, earth and planetary sciences, etc. Today’s challenges include finding and developing the most appropriate method(s) supporting the differentiation and characterisation of various types of recalcitrant organic matter in modern environments. In this study, we focus on combustion residues and coals as these two types of organic matter contain a significant amount of so-called recalcitrant organic carbon (black carbon and fossil organic carbon). Both these materials are ubiquitous, broadly stem from the same living organisms and have similar polyaromatic structures. In this respect, we tested a spectrophotometry method, classically used for sedimentology, as a very fast method for preliminary investigations. Analyses were performed with a wide range of standards and referenced samples. The results discriminate three different spectral signatures related to the degree of transformation of organic matter related to the degree of aromaticity (i.e. carbonisation). Using calibration curves, total organic carbon content can be estimated in experimental mixes with mineral matter and in a real context using subsurface sample (Gironville 101 borehole, Paris Basin, France). This method has particularly high sensitivity to very low organic matter content and is shown to be promising for a rapid evaluation of the organic carbon content.

scholarly journals Diversity and Distribution of Naked Amoebae in Water Bodies of Sumy Region (Ukraine)

2019 ◽  
Vol 53 (3) ◽  
pp. 177-186 ◽  
Author(s):  
M. K. Patsyuk ◽  
I. P. Onyshchuk
Keyword(s):  
Organic Matter ◽  
Species Composition ◽  
Organic Matter Content ◽  
Matter Content ◽  
Water Bodies ◽  
Ecological Groups ◽  
Riparian Species ◽  
Species Complexes ◽  
Wide Range ◽  
Naked Amoebae

Abstract Taxonomy of naked amoebae and specifics of their distribution in water bodies of Sumy Region are presented. Our research identified 12 species of naked amoebae of 11 morphotypes. We established their ecological groups relative to abiotic aquatic factors: euryoxidic, stenooxidic, stenobiotic and those that survive in a wide range of organic matter content. According to the species composition, swamp and riparian species complexes of naked amoebae were identified. It was found that species complexes of amoeba are influenced by such factors as temperature, concentration of dissolved oxygen and organic compounds.

Inter-relationships of Resistance to Penetration, Moisture and Soil Organic Matter with Irrigated Bean Yield in Mato Grosso do Sul, Brazil

2019 ◽  
pp. 1-12
Author(s):  
Job Teixeira de Oliveira ◽  
Cassiano Garcia Roque ◽  
Rubens Alves de Oliveira ◽  
Rafael Montanari ◽  
Claudinei Martins Guimarães ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Grain Yield ◽  
Management Practices ◽  
Organic Matter Content ◽  
Penetration Resistance ◽  
Matter Content ◽  
Mato Grosso ◽  
Geostatistical Techniques ◽  
Mato Grosso Do Sul

The common bean (Phaseolus vulgaris L) can be cultivated practically throughout the year in different regions of Brazil, provided there are no water and temperature limitations. This study was carried out in a Quartzarenic Neosol, in the municipality of Cassilândia, state of Mato Grosso do Sul (MS), Brazil, in the 2016/2017 agricultural year. This study aimed to establish the linear and spatial interrelations of the penetration resistance (PR), gravimetric moisture (GM), and organic matter content (OM) with bean grain yield (GY) in the 0.00-0.10 and 0.10-0.20 m soil layers, collected in a mesh of 117 georeferenced points [81 points of the base mesh (6 m spacing among points)] and 36 mesh points with higher density (2 m spacing among points). Data analysis was carried out by statistical and geostatistical techniques that enabled to note that the organic matter content correlates linearly and negatively with penetration resistance, indicating that soil management practices aiming to increase its profile improve its physical conditions and therefore the bean grain development and yield. The gravimetric moisture and soil organic matter content correlate spatially, directly, and linearly with bean grain yield, proving to be the best properties among those surveyed to estimate and increase its agricultural productivity.

scholarly journals Cropland soil organic matter content change in Northeast China, 1985-2005

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
Yanmin Yao ◽  
Liming Ye ◽  
Huajun Tang ◽  
Pengqin Tang ◽  
Deying Wang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Quality ◽  
Northeast China ◽  
Management Practices ◽  
Driving Forces ◽  
Organic Matter Content ◽  
Matter Content ◽  
Productive Capacity ◽  
Content Change

AbstractSoil organic matter (SOM) content is one of the most important indicators of soil quality and hence the productive capacity of soils. Northeast China (NEC) is the most important region in grain production in China. In this study,we assessed the spatiotemporal change of cropland SOM content in NEC using sampling data of 2005 and survey data of 1985. We also analysed the driving forces behind the SOM content change. Our results showed that SOM content decreased in 39% of all the cropland in NEC, while increase in SOM content was only detected on 16% of the cropland. SOM remained unchanged in nearly half (i.e. 45%) of the cropland. Our results also revealed that cropping intensity and fertilizer application were the two most important factors driving SOM change. Overall, results from this research provided novel details of the spatiotemporal patterns of cropland SOM content change in NEC which was not revealed in earlier assessments. The datasets presented here can be used not only as baselines for the calibration of process-based carbon budget models, but also to identify regional soil quality hotspots and to guide spatial-explicit soil management practices.

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