scholarly journals Soil strength and macropore volume limit root elongation rates in many UK agricultural soils

2012 ◽  
Vol 110 (2) ◽  
pp. 259-270 ◽  
Author(s):  
Tracy A. Valentine ◽  
Paul D. Hallett ◽  
Kirsty Binnie ◽  
Mark W. Young ◽  
Geoffrey R. Squire ◽  
...  
Keyword(s):  
Root Elongation ◽  
Agricultural Soils ◽  
Soil Strength ◽  
Volume Limit

Early Pinus caribaea var. hondurensis root development. 2. Influence of soil strength

1996 ◽  
Vol 36 (7) ◽  
pp. 847 ◽  
Author(s):  
A Costantini ◽  
D Doley ◽  
HB So
Keyword(s):  
Root Development ◽  
Soil Type ◽  
Root Elongation ◽  
Primary Root ◽  
High Strength ◽  
Soil Strength ◽  
Shoot Development ◽  
Pinus Caribaea ◽  
Primary Shoot ◽  
Primary Roots

The influence of penetration resistance (PR), an easily measured indicator of soil strength, on the growth of Pinus caribaea var. hondurensis radicles and seedlings was investigated. Negative exponential relationships between PR and both radicle and primary root elongation were observed. All root elongation ceased at PR levels of 3.25 MPa. Tip diameters of radicles and primary roots were positively correlated with PR values up to 2.4 MPa, whilst numbers of primary roots, total root lengths and lengths of longest roots were all negatively correlated with PR. Hypocotyl elongation was also reduced by increasing PR, although the reductions occurred at higher PRs than those which inhibited root development. In contrast, primary shoot development was unaffected by PR levels which were sufficient to stop root elongation, but was reduced in soil with a PR of 4.8 MPa. There were significant family x soil type and family x PR interactions for radicle, hypocotyl, primary root and primary shoot development. 1f these interactions are correlated with performance in the field, then they may serve as useful indicators of family suitability to both soil type and high strength soils.

Comparison of soil strength measurements of agricultural soils in Nebraska

2018 ◽  
Vol 77 ◽  
pp. 31-48 ◽  
Author(s):  
Wendy Wieder ◽  
Sally Shoop ◽  
Lynette Barna ◽  
Trenton Franz ◽  
Catherine Finkenbiner
Keyword(s):  
Agricultural Soils ◽  
Soil Strength

scholarly journals Root Tip Shape Governs Root Elongation Rate under Increased Soil Strength

2017 ◽  
Vol 174 (4) ◽  
pp. 2289-2301 ◽  
Author(s):  
Tino Colombi ◽  
Norbert Kirchgessner ◽  
Achim Walter ◽  
Thomas Keller
Keyword(s):  
Root Elongation ◽  
Soil Strength ◽  
Elongation Rate ◽  
Root Tip ◽  
Root Elongation Rate

The influence of soil strength on the penetration of a loam by plant roots

Soil Research ◽  
1965 ◽  
Vol 3 (1) ◽  
pp. 69 ◽  
Author(s):  
KP Barley ◽  
DA Farrell ◽  
EL Greacen
Keyword(s):  
Root Elongation ◽  
Soil Strength ◽  
Plant Roots ◽  
Pea Roots ◽  
Limiting Condition ◽  
General Influence

Wheat and pea roots were grown through soil crumbs until they encountered cores of more finely structured earth. The cores were prepared from a loam at various bulk densities and matric suctions. Over a range commonly found in the field, the penetration and growth of the roots were controlled chiefly by the strength of the soil. Soil strength should be regarded as a property that has a general influence on root elongation, rather than as a limiting condition encountered in unusual soils.

Soil Strength and Aeration Effects on Root Elongation

1975 ◽  
Vol 39 (5) ◽  
pp. 948-953 ◽  
Author(s):  
W. B. Voorhees ◽  
D. A. Farrell ◽  
W. E. Larson
Keyword(s):  
Root Elongation ◽  
Soil Strength

scholarly journals Surface Hardness as an Indicator of Soil Strength of Agricultural Soils

2012 ◽  
Vol 02 (04) ◽  
pp. 341-346 ◽  
Author(s):  
Gaius D. Eudoxie ◽  
Dennison Phillips ◽  
Raymond Springer
Keyword(s):  
Agricultural Soils ◽  
Surface Hardness ◽  
Soil Strength

A torsional shear box for determining the shear strength of agricultural soils

Soil Research ◽  
1982 ◽  
Vol 20 (3) ◽  
pp. 203 ◽  
Author(s):  
JE Lloyd ◽  
N Collis-George
Keyword(s):  
Shear Strength ◽  
Agricultural Soils ◽  
Field Studies ◽  
Soil Strength ◽  
Field Conditions ◽  
Soil Conditions ◽  
Strength Parameters ◽  
Torsional Shear ◽  
Wide Range ◽  
Shear Box

A hand-held torsional shear box, suitable for direct measurements of the in situ soil strength (�o) under field conditions and for laboratory determinations of shear strength parameters, is described. A field procedure is given, and the errors in the method are discussed. Under field conditions, it is simple to operate and requires a single measurement to determine �o. Field studies indicate that it is suitable for a wide range of soil conditions which occur in agricultural soils. Results are presented, which show that both moisture status and structure influence the value of �o, as well as the nature of the failure plane. Agricultural soils have a number of characteristics which make it difficult to design methods for determining soil strength parameters or to interpret empirical estimates of soil strength. Chief amongst these are: (1) marked changes in most soil physical properties with depth; (2) a polymodal distribution of pore sizes. Because the measurement is on a surface which is nearly horizontal and is of an area to allow for all forms of failure, the described torsional shear box largely overcomes these problems, and provides a value of �o which is physically interpretable and relevant to studies concerned with soil failure.

Examination of NOxand CO2production in agricultural soils

2007 ◽  
Vol 35 (2) ◽  
pp. 689-692 ◽  
Author(s):  
Krisztina Kristóf ◽  
Györgyi Kampfl ◽  
György Heltai ◽  
Erika Nótás ◽  
Abdousalam Algaidi
Keyword(s):  
Agricultural Soils
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