Effects of selected amendments on soil properties and emergence of wheat seedlings

2003 ◽  
Vol 83 (5) ◽  
pp. 615-621 ◽  
Author(s):  
C. Seker
Keyword(s):  
Portland Cement ◽  
Wheat Straw ◽  
Soil Amendments ◽  
Seedling Emergence ◽  
Aggregate Stability ◽  
Penetration Resistance ◽  
Pot Experiment ◽  
Modulus Of Rupture ◽  
Wheat Seedlings ◽  
Barnyard Manure

Crusting can have a prominent effect on seedling emergence. Crust formation at the soil surface is a common feature of many soils including the silty loam soil (Aquic Haplocalsids) from the Konya plain examined in this investigation. The effects of different soil amendments on modulus of rupture and aggregate stability in water were measured in a pot experiment in the laboratory. Seedling emergence of wheat (Triticum durum Desf.) and penetration resistance was investigated in a microplot experiment in the greenhouse. Portland cement, barnyard manure (dairy cattle), city waste compost (municipal refuse) and wheat straw were used in the pot experiment, and Portland cement and barnyard manure were investigated in the microplot experiment. Soil amendments were added to the soil samples at rates of 0, 2, 4 and 6% (wt/wt) and the samples including a control were incubated at about field capacity water content for up to 100 d in the laboratory. The moduli of rupture values and water stable aggregates were measured after 25, 50, 75 and 100 d of incubation. All the soil amendments reduced the modulus of rupture compared with the control soil sample. The modulus of rupture of the control and mixes with Portland cement, barnyard manure, city waste compost and wheat straw (6%, wt/wt) after 100 d of incubation were 726, 0, 494, 564 and 113 kPa, respectively. Aggregate stabilities of the control and the soil amended with Portland cement, barnyard manure, city waste compost and wheat straw (6%, wt/wt) after 100 d of incubation were 5.16, 55.02, 10.82, 8.44 and 34.98%, respectively. Seedling emergences of wheat and penetration resistances of the control and the soil amended with Portland cement and barnyard manure (6%, wt/wt) in the microplots were 29, 80 and 36%; 489, 0 and 471 kPa, respectively. Key words: Surface sealing, aggregate stability, seedling emergence, penetration resistance.

The effects of cultivation on the composition of organic-matter and structural stability of soils

Soil Research ◽  
1995 ◽  
Vol 33 (6) ◽  
pp. 975 ◽  
Author(s):  
A Golchin ◽  
P Clarke ◽  
JM Oades ◽  
JO Skjemstad
Keyword(s):  
Organic Matter ◽  
Chemical Composition ◽  
Organic Carbon ◽  
Organic Materials ◽  
Aggregate Stability ◽  
Soil Samples ◽  
Modulus Of Rupture ◽  
Dispersible Clay ◽  
Different Soils

Soil samples were obtained from the surface horizons of five untilled sites and adjacent sites under short- and long-term cultivation. The soil samples were fractionated based on density and organic materials were concentrated in various fractions which enabled comparative chemical composition of the organic materials in cultivated and uncultivated sites by solid-state C-13 CP/MAS NMR spectroscopy. Changes in the nature of organic carbon with cultivation were different in different soils and resulted from variations in the chemistry of carbon inputs to the soils and a greater extent of decomposition of organic materials in cultivated soils. Differences in the chemical composition of organic carbon between cultivated and uncultivated soils resided mostly in organic materials occluded within aggregates, whereas the chemistry of organic matter associated with clay particles showed only small changes. The results indicate a faster decomposition of O-alkyl C in the cultivated soils. Wet aggregate stability, mechanically dispersible clay and modulus of rupture tests were used to assess the effects of cultivation on structural stability of soils. In four of five soils, the virgin sites and sites which had been under long-term pasture had a greater aggregate stability than the cultivated sites. Neither total organic matter nor total O-alkyl C content was closely correlated with aggregate stability, suggesting that only a part of soil carbon or carbohydrate is involved in aggregate stability. The fractions of carbon and O-alkyl C present in the form of particulate organic matter occluded within aggregates were better correlated with aggregate stability (r = 0.86** and 0.88**, respectively). Cultivation was not the dominant factor influencing water-dispersible clay across the range of soil types used in this study. The amount of dispersible clay was a function of total clay content and the percentage of clay dispersed was controlled by factors such as clay mineralogy, CaCO3 and organic matter content of soils. The tendency of different soils for hard-setting and crusting, as a result of structural collapse, was reflected in the modulus of rupture (MOR). The cultivated sites had significantly higher MOR than their non-tilled counterparts. The soils studied had different MOR due to differences in their physical and chemical properties.

Effects of agricultural management on dermosols in northern Tasmania

Soil Research ◽  
2002 ◽  
Vol 40 (1) ◽  
pp. 65 ◽  
Author(s):  
W. E. Cotching ◽  
J. Cooper ◽  
L. A. Sparrow ◽  
B. E. McCorkell ◽  
W. Rowley
Keyword(s):  
Organic Carbon ◽  
Microbial Biomass Carbon ◽  
Aggregate Stability ◽  
Infiltration Rate ◽  
Penetration Resistance ◽  
Agricultural Management ◽  
Structural Development ◽  
Laboratory Techniques ◽  
Carbon Concentrations

Attributes of 15 Tasmanian dermosols were assessed using field and laboratory techniques to determine changes associated with 3 typical forms of agricultural management: long-term pasture, cropping with shallow tillage using discs and tines, and cropping (including potatoes) with more rigorous and deeper tillage including deep ripping and powered implements. Soil organic carbon in the surface 75 mm was 7.0% under long-term pasture compared with 4.3% and 4.2% in cropped paddocks. Microbial biomass carbon concentrations were 217 mg/kg, 161 mg/kg, and 139 mg/kg, respectively. These differences were negatively correlated with the number of years cropped. Greater bulk densities were found in the surface layer of cropped paddocks but these were not associated with increased penetration resistance or decreased infiltration rate and are unlikely to impede root growth. Long-term pasture paddocks showed stronger structural development and had smaller clods than cropped paddocks. Vane shear strength and penetration resistance were lower in cropped paddocks than under long-term pasture. Many soil attributes showed no significant differences associated with management. Including potatoes in the rotation did not appear to affect these dermosols, which indicates a degree of robustness in these soils. clay loams, organic carbon, soil strength, aggregate stability, land management, cropping.

THE EFFECTS OF SLOPE POSITION AND CROPPING SEQUENCE ON SOIL PHYSICAL PROPERTIES IN PRINCE EDWARD ISLAND

1988 ◽  
Vol 68 (4) ◽  
pp. 763-774 ◽  
Author(s):  
LINNELL M. EDWARDS
Keyword(s):  
Shear Strength ◽  
Hydraulic Conductivity ◽  
Prince Edward Island ◽  
Soil Depth ◽  
Aggregate Stability ◽  
Penetration Resistance ◽  
Slope Position ◽  
Bottom Slope ◽  
Freezing And Thawing ◽  
Freeze Thaw

Soil physical characteristics were examined at depth intervals of 0–15 and 15–30 cm over three slope positions (top-, mid-, and bottom-slope) for three cropping sequences (hay-barley, cereals-barley, and potato-barley). Hydraulic conductivity was a significant (P ≤ 0.05) 40–50% greater at top-slope than mid- or bottom-slope, and aggregate stability percentage was a significant 6–7% greater at bottom-slope than mid- or top-slope when the soil aggregates were pretreated by freezing and thawing (freeze/thaw). Under the potato-barley sequence shear strength, penetration resistance and bulk density were significantly greater than any other sequence by up to 29, 21 and 15%, respectively; while hydraulic conductivity and maximum penetration depth were, respectively, up to 65 and 28% lower than any other sequences. Under hay-barley, hydraulic conductivity and aggregate stability (freeze/thaw) were, respectively, up to a significant 82 and 10% greater than any other sequence. There was, therefore, significantly more compaction under potato-barley and more soil physical enhancement under hay-barley than other respective sequences. Disease severity was up to 55% greater at bottom-slope than at mid-slope or top-slope for Birka barley, which also showed a significant linear decrease (r2 = 0.89) in yield with increasing shear strength. Yield of Perth barley showed a significant linear increase with increasing soil depth (r2 = 0.92) and clay-silt content (r2 = 0.78). Key words: Aggregate stability (freeze/thaw), crop rotation, penetration resistance, shear strength, barley, potatoes, hay

AGGREGATE STABILITY AND SEAL FORMATION AS AFFECTED BY DROPSʼ IMPACT ENERGY AND SOIL AMENDMENTS

Soil Science ◽  
1992 ◽  
Vol 154 (2) ◽  
pp. 113-119 ◽  
Author(s):  
I. SHAINBERG ◽  
G. J. LEVY ◽  
P. RENGASAMY ◽  
H. FRENKEL
Keyword(s):  
Impact Energy ◽  
Soil Amendments ◽  
Aggregate Stability

scholarly journals Effects of Biochar on Ca, Mg and B Uptake of Peach Seedlings

2019 ◽  
Vol 136 ◽  
pp. 07009
Author(s):  
Jing Sun ◽  
Jiaxi Han ◽  
Yingying Huang ◽  
Qianhe Jing ◽  
Aihui Li ◽  
...  
Keyword(s):  
Trace Elements ◽  
Wheat Straw ◽  
Pot Experiment ◽  
Corn Straw ◽  
Paddy Straw ◽  
Rape Straw ◽  
Stems And Leaves ◽  
B Uptake ◽  
Mg Content

A pot experiment was conducted to study the effects of different biochar types [addition of rape straw biochar (RB), addition of paddy straw biochar (PB), addition of wheat straw biochar (WB) and addition of corn straw biochar (MB)] on the absorption of Ca, Mg and B in peach seedlings. The result showed that compared to the control, all treatments added with biochar significantly decreased the Ca content in roots in peach seedlings. The Ca content in stems and leaves under the treatment of RB and PB in peach seedlings was higher than the control. The Mg content in roots and stems under the treatment of PB in peach seedlings was higher than the control. The Mg content in leaves in peach seedlings of all treatments added with biochar was lower than the control. The B content in roots, stems and leaves under the treatment of PB, WB and MB in peach seedlings was higher than the control and the B content under the treatment of PB was at a higher level. Therefore, the treatment of PB was beneficial to the absorption of trace elements in peach seedlings.

Persistent improvements in the structure and hydraulic conductivity of a Ferrosol due to liming

Soil Research ◽  
2007 ◽  
Vol 45 (3) ◽  
pp. 218 ◽  
Author(s):  
J. M. Kirkham ◽  
B. A. Rowe ◽  
R. B. Doyle
Keyword(s):  
Hydraulic Conductivity ◽  
Organic Carbon ◽  
Soil Structure ◽  
Aggregate Stability ◽  
Aggregate Size ◽  
Soil Surface ◽  
Penetration Resistance ◽  
Organic C ◽  
Soil Penetration Resistance ◽  
Wet Aggregate Stability

Changes in the soil structure and hydraulic conductivity of an Acidic Red Ferrosol were measured in a long-term (1968–2003) fertiliser experiment on pasture in north-western Tasmania, Australia. Studies were initiated following observations of both softer soil surface and cracking on plots that had received 15 t/ha of ground agricultural limestone. Liming decreased penetration resistance and increased hydraulic conductivity. These structural improvements were associated with increased mean dry aggregate size, a small increase in wet aggregate stability, higher exchangeable calcium levels, and increased plant growth, but a 9% decrease in total soil organic carbon in the surface 50 mm. This decrease in organic carbon was not associated with deterioration in soil structure, as may have been anticipated. This was probably because total organic C was still 82 g/kg on unlimed plots. Decreases in soil penetration resistance due to liming increased the likelihood of pugging from livestock but may improve ease of tillage. This research demonstrates that liming can improve the structure of a well-aggregated Ferrosol as well as its previously reported effects of increasing soil pH and yields of pasture and barley despite decreasing organic C.

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