STABILIZATION OF RESIDUAL C AND N IN SOIL

1988 ◽  
Vol 68 (4) ◽  
pp. 733-745 ◽  
Author(s):  
R. A. JANZEN ◽  
C. F. SHAYKEWICH ◽  
TEE BOON GOH
Keyword(s):  
Wheat Straw ◽  
Clay Soil ◽  
Organic Matter Content ◽  
Matter Content ◽  
Red River ◽  
Residue Management ◽  
Plant Residue ◽  
Fertilizer Treatment ◽  
C And N ◽  
N Incorporation

Three Manitoba soils varying in clay and organic matter content were mixed with each of four plant residue amendments: (1) a control where no plant or fertilizer materials were added; (2) 14C- and 15N-labelled wheat straw; (3) 14C- and 15N-labelled wheat straw plus 15N-labelled KNO3; and (4) 14C- and 15N-labelled prebloom alfalfa residue. The soils were incubated at 20 °C and 75% field capacity for 90 d. Soil samples were collected at 0, 7, 30, and 90 d of incubation. Two humic acid fractions were obtained from the amended soils. Fraction A was obtained by Na4P2O7 extraction and Fraction B was recovered from the remaining residue by sonication. Significant (P < 0.05) differences were observed in the incorporation of 14C and 15N into both fractions. The effect of clay content on C and N incorporation was most marked in Fraction B: C incorporation in all treatments tended to be higher in the Red River Clay soil than in the Newdale (bottom of the knoll) soil; N incorporation in the straw and alfalfa treatments tended to be higher in the Red River Clay soil but, in the straw-plus-fertilizer treatment, N incorporation tended to be higher in the Newdale (bottom of the knoll) soil. The effect of the form of C and N in the residue was most apparent in the incorporation of N into Fraction B: in all soils the level of 15N in the alfalfa treatment was significantly (P < 0.05) higher than that in the straw plus fertilizer treatment. Key words: Plant residue management, incorporation, incubation, C and N turnover, KNO3 fertilizer

Soil Improvement Following Addition of Chipped Wood from Twigs

1998 ◽  
Vol 13 (3) ◽  
pp. 132-137 ◽  
Author(s):  
Roger Lalande ◽  
Valentin Furlan ◽  
Denis A. Angers ◽  
Gilles Lemieux
Keyword(s):  
Organic Matter Content ◽  
Chemical Properties ◽  
Aggregate Stability ◽  
Soil Improvement ◽  
Matter Content ◽  
Residual Effects ◽  
Physical Attributes ◽  
C And N ◽  
Wet Aggregate Stability ◽  
Physical And Chemical

AbstractWood residues are applied to soils to improve their organic matter content and related biological, physical, and chemical properties. We monitored the changes in soil total C and N content, the bacterial, fungal and actinomycetal populations, and microbial biomass and activity during 20 weeks in the first season following the application of chipped wood from twigs (CWT), and as residual effects during the second growing season on a loamy soil (coarse loamy, mixed, frigid, Humic Fragiorthod) in Sainte-Brigitte-des-Saults (Québec) Canada. Wet-aggregate stability and the content of nutrients of the soil also were determined. Adding CWT stimulated the bacterial and actinomycetal populations very rapidly (within 8 weeks); in the second season the effect was less pronounced and gradually disappeared. The most significant and long-lasting effect was on the fungal population in two consecutive years of observation, with increases of up to 24-fold. This stimulation of fungi possibly was responsible for the large and significant increase in wet-aggregate stability observed in the second year. The effect of CWT on alkaline phosphatase activity and total C and N was observed only in the second season. Someimmobilization was seen only in the season immediately following residue application. The addition of the CWT also supplied micronutrients, in particular Zn, which would make it a useful source of some elements in deficient soils. Application of CWT to this soil greatly improved its quality, as revealed by its biological, chemical, and physical attributes.

scholarly journals Stabilization of Marine Clay Soil Using Polyurethane

2018 ◽  
Vol 250 ◽  
pp. 01004 ◽  
Author(s):  
Samaila Saleh ◽  
Nur Zurairahetty Mohd Yunus ◽  
Kamarudin Ahmad ◽  
Nazri Ali
Keyword(s):  
Compressive Strength ◽  
Moisture Content ◽  
Unconfined Compressive Strength ◽  
Clay Soil ◽  
Organic Matter Content ◽  
Road Construction ◽  
Liquid Limit ◽  
Matter Content ◽  
Marine Clay ◽  
The Road

Many chemicals stabilisation techniques are being employed all over the world to improve the engineering and physical properties of the problematic soils and reduce the potential damages caused by them. Out of those chemical stabilisation technics, application of Polyurethane to improve the strength of marine clay was investigated in the laboratory. Characterization of the soil geotechnical properties was carried out by conducting laboratory test that includes natural moisture content, Atterberg limits, grains sizes analyses, specific gravity, moisture-density relationship, unconfined compressive strength (UCS), organic matter content and PH tests. Unconfined compressive strength test at optimum moisture content with varying the dose of the Polyurethane content was conducted to test the effectiveness of Polyurethane as a chemical stabiliser. The result of the preliminary tests of the sample shows that the soil has a liquid limit of 65%, plastic limit of 26% and plasticity index of 53%. The percentages of gravel, sand and fines in the marine clay sample were 0 %, 1.32 % and 98.68 % respectively %. The results of the UCS test also revealed that Polyurethane stabilisation improved the strength of marine clay by 230%. Thus, the improvement in strength of stabilised marine clay soil can significantly reduce the overall thickness of the pavement and total cost of the road construction in future.

scholarly journals Effectivity of bulrush (Scirpus californicus.) as a soil conditioner in increasing sandy and clay soil fertility

2021 ◽  
Vol 22 (8) ◽  
Author(s):  
Munifatul Izzati ◽  
SRI HARYANTI ◽  
RINI BUDI HASTUTI
Keyword(s):  
Organic Matter ◽  
Soil Fertility ◽  
Water Retention ◽  
Clay Soil ◽  
Organic Matter Content ◽  
Matter Content ◽  
Clay Soils ◽  
Soil Conditioner ◽  
Soil P ◽  
Scirpus Californicus

Abstract. Izzati M, Haryanti S, Hastuti RB. 2021. Effectivity of bulrush (Scirpus californicus) as a soil conditioner  increasing sandy and clay soil fertility. Biodiversitas 22: 3423-3429. Bullrush (Scirpus californicus) is a species of macrophytes that often populates lakesides. This aquatic plant was rarely studied and its use has not been explored yet. This study was carried out to determine the effects of soil conditioner made from bulrush on sandy and clay soil fertility. Collected bulrush from Rawa Pening lake was milled into a powder and used as a soil conditioner in a proportion of 1:1. After a week, soil fertility was evaluated including organic matter content, water retention, the ratio of C/N, and bacteria population. The study was designed using a Completely Randomized Design with two treatments and control. Resulted data were analyzed using a t-test to evaluate the difference between the two treatments. Results showed that bulrush powder application significantly increased sandy and clay soil fertility. The organic matter content significantly increased in both sandy (p<0,01) and clay soils (p<005). The water retention of sandy soil was increased by 74% (p<0,01), while in clay soil was reduced by 27% (p<0,01). The C/N ratio was significantly reduced in both sandy and clay soil (p<0,05), while the bacteria population significantly increased (p<0,01). It is suggested to use the bulrush as a soil conditioner particularly for sandy and clay soils.

Decomposition of plant material in Australian soils .IV. Decomposition in situ of 14C labeled and 15N labeled legume and wheat materials in a range of southern Australian soils

Soil Research ◽  
1987 ◽  
Vol 25 (1) ◽  
pp. 95 ◽  
Author(s):  
M Amato ◽  
JN Ladd ◽  
A Ellington ◽  
G Ford ◽  
JE Mahoney ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Properties ◽  
Wheat Straw ◽  
Organic Matter Content ◽  
Chemical Properties ◽  
Matter Content ◽  
Organic N ◽  
Root Decomposition ◽  
Plant Materials ◽  
Organic C

14C- and 15N-labelled wheat straw, and tops or roots of a pasture legume (either Medicago littoralis or Trifolium subterraneum) were incorporated into topsoils at 12 field sites in southern Australia. These sites were representative of soil types widely used for wheat growing in each region. The soils varied markedly in their physical and chemical properties (e.g. pH, texture and organic matter content). Based on amounts of residual I4C (averaged for all sites), the legume tops decomposed more extensively than did wheat straw, especially soon after incorporation. To a lesser extent the legume tops decomposed more extensively than legume roots, and T. subterraneum tops more than M. littoralis tops; root decomposition for both legumes was similar. For example, after 1 year, the residual organic 14C from wheat straw, M. littoralis tops, T. subterraneum tops and legume roots accounted for 48%, 41%, 38% and 54% of their respective inputs. After two years, residual 14C of wheat straw accounted for 30% of the input. Differences in decomposition due to climate and soil properties were generally small, but at times were statistically significant; these differences related positively with rainfall and negatively with soil clay content, but showed no relationship with pH or soil organic C and N. Some N was mineralized from all plant materials, the greatest from legume tops, the least from wheat straw. After 1 year, residual organic 15N accounted for 56%, 63% and 78% respectively of input l5N from legume tops and roots and from wheat straw. The influence of climate and soil properties on amounts of residual organic I5N was small and generally was consistent with those found for residual 14C. AS an exception, the residual organic 15N from wheat straw was negatively related to soil organic N levels, whereas residual I5N of legume tops and roots and residual 14C of all plant materials were not influenced by soil organic matter levels. These results are discussed in terms of the turnover of N in soils amended with isotope labelled plant materials of different available C:N ratios.

scholarly journals Influence of Organic Matter Content on Engineering Properties of Clays

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yue Gui ◽  
Qiumin Zhang ◽  
Xiaqiang Qin ◽  
Jianfei Wang
Keyword(s):  
Organic Matter ◽  
Shear Strength ◽  
Moisture Content ◽  
Void Ratio ◽  
Clay Soil ◽  
Organic Matter Content ◽  
Friction Angle ◽  
Matter Content ◽  
Atterberg Limit ◽  
Shear Characteristics

Most natural sedimentary clay contains organic matter, and even a small amount of organic matter will have a great impact on the physical and mechanical properties of clay. In order to clarify the influence of organic matter content on clay soil, the illite-quartz mixture was mixed with natural amorphous peat soil (organic matter content is 50%) in different proportions for studying the influence of different organic matter contents on the physical properties (specific gravity, Gs; moisture content, w ; void ratio, e; liquid limit, w L ; plastic limit, w p ; plasticity index, Ip) and shear characteristics (cohesion, c; friction angle, φ) of clay soil. The experimental results found that, with the change of organic matter content, the specific gravity and void ratio of clay changed linearly, while the water content, Atterberg limit, shear strength, cohesion, and friction angle changed nonlinearly with the increase of organic matter content. Moisture content and Atterberg limit have a turning point when OC = 7.5%. Shear strength, cohesion, and friction angle all have obvious turning points when OC = 7.5% and OC = 37.5%. The variation of moisture content and Atterberg limit with organic matter content indicates that OC = 7.5% may be the limit value for the different forms of organic matter in the clay. When OC ≤ 7.5%, the organic matter in clay is in the bound state; when OC > 7.5%, the bound organic matter reaches saturation; and the free organic matter gradually increases. The change law of shear strength characteristics with organic matter content shows that the interaction between minerals and organic matter exhibits different shear characteristics under different organic matter content. When OC ≤ 7.5%, clay shows mineral properties, when 7.5% < OC ≤ 37.5%, clay shows mineral-free organic matter properties, and when OC > 37.5%, clay shows free organic matter properties.

MOVEMENT OF PICLORAM IN SOIL COLUMNS

1973 ◽  
Vol 53 (3) ◽  
pp. 307-314 ◽  
Author(s):  
R. GROVER
Keyword(s):  
Organic Matter ◽  
Clay Soil ◽  
Sandy Loam ◽  
Organic Matter Content ◽  
Matter Content ◽  
Soil Columns ◽  
Canadian Prairie ◽  
Prairie Soils ◽  
Loam Soil ◽  
Water Holding

The movement of picloram (4-amino-3,5,6-trichloropicolinic acid) was studied in various Canadian Prairie soils, using soil columns. Picloram was readily leached in all soil types. The movement was greatest in the soil with the lowest organic matter and clay contents, and lowest in black soils that are high in soil organic matter content. It was related, in general, to the adsorptive and water-holding capacities of these soils. The extent of leaching of picloram was also related to the total amount of water applied; the greater the amount o¡ water the greater the downward movement. Increasing the intensity of water increments from 0.25 to 2.5 cm enhanced the movement of picloram in the clay soil but had no effect in the sandy loam. There was little or no difference in the movement of picloram when the herbicide was applied at 2.0 or 0.2 kg/ha, Picloram leached to a greater depth when the sandy loam soil was initially dry than wet and the converse was true for the clay soil. Picloram moved readily upwards when the soil columns were subirrigated.

scholarly journals THE IMPACT OF AGRICULTURAL SYSTEMS IN THE SOIL ORGANIC MATTER CONTENT IN BRAZILIAN CERRADO

2019 ◽  
Vol 7 (8) ◽  
pp. 220-244
Author(s):  
Arcângelo Loss ◽  
Marcos Gervasio Pereira ◽  
Sidinei Julio Beutler ◽  
Adriano Perin ◽  
Marisa de Cassia Piccolo ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Matter Content ◽  
Matter Content ◽  
Plant Residues ◽  
Soil Composition ◽  
Δ13c And Δ15n ◽  
Soil Organic Matter Content ◽  
Cerrado Vegetation ◽  
C And N ◽  
The Impact

Were quantified the plant residues on the soil, total soil organic carbon (TOC) and nitrogen (TN) contents and the different soil organic matte (SOM) fractions and to determine 13C and 15N isotopic soil composition and plant residues in the crop–livestock integration system (CLIS), pasture and Cerrado areas, in Goias, Brazil. TOC and TN, C and N light organic matter content (C-LOM/N-LOM); C and N of particulate organic matter (C-POM/N-POM); and mineral organic matter (C-MOM/N-MOM) were evaluated. δ13C and δ15N of soil and LOM, POM, and MOM fractions, as well as the δ13C of plant residues, were also determined. Plant residues from pasture were more enriched with nutrients and C, and CLIS which are richer in N. δ13C of pasture and CLIS soils indicated that the C from the Cerrado vegetation (typically C3) was replaced by vegetation with C4 photosynthetic mechanisms. CLIS accumulated more TOC than the pasture, and provided higher C-MOM and N-MOM values than pasture, and higher N-LOM levels than pasture and Cerrado. δ13C of LOM is associated with more recent origins of carbon. δ15N of POM and soil of the CLIS and pasture indicate greater mineralization of SOM.

Forages underseeded in barley for residue management for potatoes

2001 ◽  
Vol 81 (1) ◽  
pp. 205-210 ◽  
Author(s):  
D. A. Holmstrom ◽  
H. T. Kunelius ◽  
J. A. Ivany
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Root Biomass ◽  
Organic Matter Content ◽  
Red Clover ◽  
Matter Content ◽  
Italian Ryegrass ◽  
Residue Management ◽  
Soil Organic Matter Content ◽  
Berseem Clover

Producers have attempted to increase soil organic matter content in a 2-yr rotation of barley-potato by underseeding barley with forage grasses and legumes. A study beginning in 1996 was initiated to evaluate the effect of this practice on barley yields, root biomass, soil organic matter content, ease of post-harvest tillage as measured by a soil penetrometer and surface plant residue levels for the first year of a 2-yr rotation of barley-potato. Barley seeded alone, barley underseeded with berseem clover, barley underseeded with timothy/red clover, barley underseeded with timothy/red clover fall chisel plowed and barley underseeded with Italian ryegrass were evaluated with and without a fall application of glyphosate on a well-drained, fine sandy loam, Orthic Humo-Ferric Podzol soil. Barley yields were not affected by underseeding. Despite an increase in root biomass for some of the underseeded crops, soil organic matter content was not affected. Potato producers attempting to increase soil organic matter content in a 2-yr rotation of barley-potato by underseeding barley with a forage crop are advised to consider using annual forages such as berseem clover or other solutions such as residue management. Underseeding barley with red clover/timothy will require either a fall application of glyphosate or extra spring tillage to eliminate living plants. By underseeding barley, producers are incurring additional costs and eliminating the option of practising residue management, a soil conservation practice, unless they use glyphosate at an additional cost. Key words: Soil organic matter, glyphosate, root biomass, Italian ryegrass, red clover, berseem clover

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