Soil Structure, Soil Water and Drought

2011 ◽  
pp. 69-75
Author(s):  
Igori Arcadie Krupenikov ◽  
Boris P. Boincean ◽  
David Dent
Keyword(s):  
Soil Water ◽  
Soil Structure

The influence of soil structure and stress history on the soil–water characteristics of a compacted till

Géotechnique ◽  
1999 ◽  
Vol 49 (2) ◽  
pp. 143-159 ◽  
Author(s):  
S. K. Vanapalli ◽  
D. G. Fredlund ◽  
D. E. Pufahl
Keyword(s):  
Soil Water ◽  
Soil Structure ◽  
Stress History ◽  
Water Characteristics

Soil structure, soil hydraulic properties and the soil water balance

Soil Research ◽  
1992 ◽  
Vol 30 (3) ◽  
pp. 265 ◽  
Author(s):  
HP Cresswell ◽  
DE Smiles ◽  
J Williams
Keyword(s):  
Hydraulic Conductivity ◽  
Water Balance ◽  
Soil Water ◽  
Soil Structure ◽  
Hydraulic Properties ◽  
Rainfall Regime ◽  
Soil Hydraulic Properties ◽  
Matric Potential ◽  
Moisture Characteristic

We review the influence of soil structural change on the fundamental soil hydraulic properties (unsaturated hydraulic conductivity and the soil moisture characteristic) and utilize deterministic modelling to assess subsequent effects on the soil water balance. Soil structure is reflected in the 0 to -100 kPa matric potential section of the soil moisture characteristic with marked changes often occurring in light to medium textured soils' (sands, sandy-loam, loams and clay-loams). The effect of long-term tillage on soil structure may decrease hydraulic conductivity within this matric potential range. The 'SWIM' (Soil Water Infiltration and Movement) simulation model was used to illustrate the effects of long-term conventional tillage and direct drilling systems on the water balance. The effects of plough pans, surface crusts and decreasing surface detention were also investigated. Significant structural deterioration, as evidenced by substantially reduced hydraulic conductivity, is necessary before significant runoff is generated in the low intensity rainfall regime of the Southern Tablelands (6 min rainfall intensity <45 mm h-1). A 10 mm thick plough pan (at a depth of 100 mm) in the A-horizon of a long-term conventionally tilled soil required a saturated hydraulic conductivity (K,) of less than 2.5 mm h-1 before runoff exceeded 10% of incident rainfall in this rainfall regime. Similarly, a crust K, of less than 2.5 mm h-1 was necessary before runoff exceeded 10% of incident rainfall (provided that surface detention was 2 or more). As the crust K, approached the rainfall rate, small decreases in Ks resulted in large increases in runoff. An increase in surface detention of 1 to 3 mm resulted in a large reduction in runoff where crust K, was less than 2-5 mm h-1. Deterministic simulation models incorporating well established physical laws are effective tools in the study of soil structural effects on the field water regime. Their application, however, is constrained by insufficient knowledge of the fundamental hydraulic properties of Australian soils and how they are changing in response to our land management.

Two Indices of Soil Structure Based on Prediction of Soil Water Processes

1998 ◽  
Vol 62 (1) ◽  
pp. 223-232 ◽  
Author(s):  
G. W. Geeves ◽  
B. W. Murphy ◽  
H. P. Cresswell
Keyword(s):  
Soil Water ◽  
Soil Structure ◽  
Two Indices

scholarly journals Effects of Intercropping on Soil Fractal Dimension and Physicochemical Properties in the Karst Areas

2021 ◽  
Author(s):  
Qin qin Xu ◽  
Kang ning Xiong ◽  
Yong kuan Chi
Keyword(s):  
Fractal Dimension ◽  
Physicochemical Properties ◽  
Soil Water ◽  
Soil Structure ◽  
Salvia Miltiorrhiza ◽  
Chemical Properties ◽  
Spatial Optimization ◽  
Organic Carbon Content ◽  
System Productivity ◽  
Fine Grained

Suitable soil structure and nutrient security are important for plant growth and development, characteristics of soil fractal dimension and distribution of physical and chemical properties and their interactions play an important role in studying the stability of soil structure and water and fertilizer cycles. As a sustainable management model, intercropping has positive benefits for erosion control, spatial optimization of resources, as well as improving system productivity. The effects of four intercropping methods on soil fractal dimension and physicochemical properties were investigated by intercropping Salvia miltiorrhiza with forage and S. miltiorrhiza with forest under typical karst rock desertification habitats in Guizhou. The results showed that soil nutrient content of intercropping was significantly higher than that of monoculture, the organic carbon content of soil grown under forest is higher than other treatments, and there was a non-significant change in soil water content of intercropping compared with monoculture. The soil fine-grained matter of intercropping was significantly higher than that of monoculture, while the soil fractal dimension showed a tendency to become larger with the increase of fine-grained matter. The intercropping planting, due to its component types and spatial and temporal configurations, leads to differences in soil water and fertilizer interactions, which can be combined with other ecological restoration measures to optimize the composite model and jointly promote the restoration and development of ecologically fragile areas.

Soil structure and crop yield over a 5-year period following subsoiling Solonetzic and Chernozemic soils in Saskatchewan

1993 ◽  
Vol 73 (1) ◽  
pp. 81-91 ◽  
Author(s):  
M. C. J. Grevers ◽  
E. de Jong
Keyword(s):  
Soil Water ◽  
Soil Salinity ◽  
Crop Production ◽  
Soil Structure ◽  
Soil Bulk Density ◽  
First Year ◽  
Soil Water Depletion ◽  
Water Recharge ◽  
Use Efficiency ◽  
Soil Water Recharge

The effect of subsoiling of Solonetzic and of Chernozemic soils was studied over a 5-yr period under dryland conditions and under irrigation, involving 11 farm sites, and 2 soil zones. Subsoiling reduced soil density for up to 3 yr on most of the Solonetzic soils and on one of the Chernozemic soils. Overwinter soil-water recharge in subsoiled Solonetzic soils was increased for up to 3 yr, but not in subsoiled Chernozemic soils. Under irrigated conditions, subsoiling reduced soil salinity and sodicity at one site; however, under dryland conditions soil salinity and sodicity levels remained unaltered. Crop emergence on one of the Solonetzic soils was decreased in the first year after subsoiling because of poor seedbed conditions. Subsoiling increased crop production on Solonetzic soils in the 1st, 2nd, 3rd and in the 4th years, and at one site in the 5th year. Subsoiling did not affect crop production on Chernozemic soils. Increased crop production resulted from increased soil water depletion with depth, and also from greater crop water-use efficiency. Soil loosening by subsoiling, as indicated by decreased soil bulk density of the B horizon lasted up to 3 yr, during which the largest yield increases were measured. The results suggest that subsoiling may have to be repeated every 5 yr or more. Key words: Subsoiling, amelioration, soil water, crop growth

scholarly journals Coupled effects of canal lining and multi-layered soil structure on canal seepage and soil water dynamics

2012 ◽  
Vol 430-431 ◽  
pp. 91-102 ◽  
Author(s):  
Liqiang Yao ◽  
Shaoyuan Feng ◽  
Xiaomin Mao ◽  
Zailin Huo ◽  
Shaozhong Kang ◽  
...  
Keyword(s):  
Soil Water ◽  
Soil Structure ◽  
Layered Soil ◽  
Water Dynamics ◽  
Soil Water Dynamics ◽  
Canal Seepage

scholarly journals Correcting Inaccurately Recorded Data due to Faulty Calibration of a Capacitance Water Content Probe

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Mohammad N. ElNesr ◽  
A. A. Alazba ◽  
Mohammad A. El-Farrah
Keyword(s):  
Mathematical Method ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Soil Structure ◽  
Acceptable Accuracy ◽  
Substantial Error ◽  
Recorded Data ◽  
Probe Calibration

Measuring soil water content by capacitance probes requires rigorous calibration to achieve acceptable accuracy. Some of the capacitance probes' users might take several readings using the default device calibrations or other prestored calibrations by mistake. This can lead to logging of faulty readings for periods of up to months or years. This study aimed to (1) study the importance of probe calibration and the level of error that results from using flawed calibrations and (2) to develop a mathematical method to correct the faulty recorded data. This research involved studying eleven scenarios of faulty calibrations including errors in the air/water calibration and in the in-soil calibration. A mathematical method was developed to correct the faulty recorded data and comparisons were made for the data after and before correction. Results indicated that using the manufacturer's default calibration within the software resulted in substantial error values especially for heavy textured soils. It is recommended that users and especially researchers should perform rigorous in-soil calibration wherever the probe is installed, and they should repeat the calibrations whenever the soil structure changed.

scholarly journals Oilseed Radish Effects on Soil Structure and Soil Water Relations

2010 ◽  
Vol 47 (1) ◽  
pp. 1-22 ◽  
Author(s):  
G. A. Lehrsch ◽  
J. J. Gallian
Keyword(s):  
Soil Water ◽  
Water Relations ◽  
Soil Structure ◽  
Oilseed Radish
Sign in / Sign up

Export Citation Format

Share Document