Subsoiling for Sunflower Production in the Southeast Coastal Plains

Sojka, R.E.; Busscher, W. J.; Gooden, Dewitt T.; Morrison, W. H.

doi:10.2136/sssaj1990.03615995005400040031x

Cited by 27 publications

(15 citation statements)

References 15 publications

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“…Considering the critical PR of 2 MPa in which root growth may decline (Baquero et al, 2012;Sojka et al, 1990), we have additional evidence that soil conditions likely limited root growth. The maximum PR value observed was 2.…”

Section: Environmental Conditionsmentioning

confidence: 97%

Root growth and distribution in sugarcane cultivars fertigated by a subsurface drip system

Ohashi¹,

Pires²,

Ribeiro

et al. 2015

Bragantia

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Despite of the agronomic importance for water management, few studies of sugarcane roots have been performed under field conditions during the crop cycle. The aim of this study was to determine the cumulative root density (L A ), root distribution on soil profile and the effective rooting depth (ERD) for three sugarcane cultivars using the minirhizotron method. A field experiment was done with sugarcane cultivars IACSP94-2094, IACSP94-2101 and SP79-1011 grown under subsurface drip fertigation. Soil chemical and physical characteristics were also evaluated. Root evaluations were taken at 38, 58, 123, 185 and 205 days during the second ratoon, considering the soil profile until 0.8 m depth. The highest L A and root growth rates were found up to 0.4 m soil layer for all cultivars. Root growth rate varied during the crop cycle, with the highest values being found between 38 and 58 days after ratoon (DAR). There was a genotypic variation in root growth, with IACSP94-2101 showing the highest L A of 12.9 mm cm

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Section: Environmental Conditionsmentioning

confidence: 97%

Root growth and distribution in sugarcane cultivars fertigated by a subsurface drip system

Ohashi¹,

Pires²,

Ribeiro

et al. 2015

Bragantia

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“…Reductions in soil strength have led to increased plant growth (Young et al, 1997), improved tilth leading to better soil conditions for growth (Tapela and Colvin, 1998;Sojka et al, 1997), and increased crop yield and quality (Raper et al, 1998;Sojka et al, 1990Sojka et al, , 1991Sojka et al, , 1997.…”

mentioning

confidence: 99%

In Situ Strength, Bulk Density, and Water Content Relationships of a Durinodic Xeric Haplocalcid Soil

Sojka

Busscher²,

Lehrsch

2001

Soil Science

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Compaction significantly reduces yield, quality, and profitability of irrigated crops in the US Pacific Northwest (PNW). Compaction assessment is usually done via bulk density measurement, even though crops respond negatively to excessive compaction largely because of root penetration (soil strength) limitations, not because of bulk density per se. For most soils, strength is thought to depend primarily on the interaction of water content and bulk density. We hypothesized that the soil strength (expressed as cone index) of an important PNW soil, Portneuf silt loam (Durinodic Xeric Haplocalcid), could be predicted for a given bulk density or water content and that it would increase with increasing bulk density and decreasing water content. To test this, the in situ cone index, the bulk density and water content profile of a 1.5-ha field was intensively sampled three times over a 2-year period, producing 688 data triplets. These data were used to produce soil water strength-bulk density response surface relationships using robust curve fitting. Cone index relationships were poor when derived from full-profile data sets but improved when data were segregated by depths. When grouped by depth intervals, cone indices of individual layers were always correlated strongly with soil water content, but not always with bulk density. The high calcium carbonate content of this soil was thought to have produced cementation effects on the cone index that varied with prolonged wetting versus prolonged drying. Variability among in situ strength penetrations and bulk density cores was also thought to reduce model accuracy. The difficulties inherent in developing the comprehensive relationships of soil strength to bulk density, and the overriding dependency of strength on the dynamic variable of water content, suggest great uncertainty when using bulk density sampling for realistic assessment of overall soil status affecting root restriction or crop performance unless sampling is extensive and the relationships between strength, bulk density, and water content have been intensively documented for an individual soil. (Soil Science 2001;166: 520-529)

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“…Mechanical loosening of subsoils involves deep tillage, also known as deep ripping (Reeves and Touchton 1991;O'Sullivan 1992;Dunker et al 1995;Allen and Musick 2001;Wesley et al 2001) and subsoiling (Sojka et al 1990;Jasa and Dickey 1991;Reeves and Mullins 1995;Raper 2005). Interactions between soil and tine have been researched and known for the last 30 years (Godwin and Spoor 1977;Spoor and Godwin 1978) but the field application of ripping is highly varied and often without sufficient cognisance of the processes governing success.…”

Section: Deep and Deeper Tillagementioning

confidence: 99%

High clay contents, dense soils, and spatial variability are the principal subsoil constraints to cropping the higher rainfall land in south-eastern Australia

MacEwan¹,

Crawford²,

Newton

et al. 2010

Soil Res.

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Abstract. Available soil information and unpublished data from soil survey indicate that high clay contents and high bulk density are the major subsoil constraints to crop growth in the high rainfall zone (HRZ) of south-eastern Australia. Seven high rainfall agroecological zones are proposed as sub-divisions of the region to focus future research and development. The HRZ is dominated by texture-contrast soils (69.9%) and soils with clay subsoil (89.4%) and high bulk density (mean 1.6 t/m 3 ). Sodicity and acidity are also significant constraints to crop production in the HRZ. The physical limitations to root growth in the HRZ subsoils are best appreciated through the least-limiting water range concept and growth-limiting bulk densities. Management options and results of past research and intervention in soil loosening, drainage, raised beds, liming, and gypsum are reviewed. Climatic uncertainty raises questions about the future relevance of waterlogging as a constraint in the HRZ and confounds the development of reliable recommendations for engineering intervention.

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Subsoiling for Sunflower Production in the Southeast Coastal Plains

Cited by 27 publications

References 15 publications

Root growth and distribution in sugarcane cultivars fertigated by a subsurface drip system

Root growth and distribution in sugarcane cultivars fertigated by a subsurface drip system

In Situ Strength, Bulk Density, and Water Content Relationships of a Durinodic Xeric Haplocalcid Soil

High clay contents, dense soils, and spatial variability are the principal subsoil constraints to cropping the higher rainfall land in south-eastern Australia

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