Soil moisture redistribution and infiltration in frozen sandy soils

1999 ◽  
Vol 35 (1) ◽  
pp. 95-103 ◽  
Author(s):  
Manfred Stähli ◽  
Per-Erik Jansson ◽  
Lars-Christer Lundin
Keyword(s):  
Soil Moisture ◽  
Sandy Soils ◽  
Moisture Redistribution

scholarly journals Environmental effects on efficacy of herbicides for postemergence goosegrass (Eleusine indica) control

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Avat Shekoofa ◽  
James T. Brosnan ◽  
Jose J. Vargas ◽  
Daniel P. Tuck ◽  
Matthew T. Elmore
Keyword(s):  
Soil Moisture ◽  
Environmental Effects ◽  
Vapor Pressure Deficit ◽  
Sandy Soils ◽  
Silica Sand ◽  
Soil Drying ◽  
Silt Loam ◽  
Evaporative Demand ◽  
Eleusine Indica ◽  
High Soil Moisture

AbstractExperiments were conducted to understand environmental effects on efficacy of herbicides used to control goosegrass (Eleusine indica L. Gaertn.). Herbicides were applied to goosegrass maintained at soil moisture contents (VMC) of < 12%, 12 to 20%, or > 20%. Herbicides included fenoxaprop-p-ethyl (140 g ha−1), topramezone (25 g ha−1), foramsulfuron (44 g ha−1), 2,4-D + dicamba + MCPP + carfentrazone (860 + 80 + 270 + 28 g ha−1), and thiencarbazone-methyl + foramsulfuron + halosulfuron-methyl (22 + 45 + 69 g ha−1). Goosegrass control increased as VMC increased. Vapor pressure deficit (VPD) and air temperature were manipulated to determine effects of evaporative demand on foramsulfuron. Effects of soil drying were also studied following foramsulfuron application. Reductions in transpiration rate (TR) and leaf area were greatest with foramsulfuron applications to goosegrass in silt-loam under high evaporative demand (3 kPa VPD, 38 °C). Foramsulfuron had no effect on goosegrass in silica-sand regardless of evaporative demand. TR dropped to 0.2 mmh−1 within eight days after application to goosegrass in silt-loam compared to 18 days in silica-sand. Overall, foramsulfuron efficacy on goosegrass was maximized under conditions of high soil moisture and evaporative demand, and may be reduced in sandy soils that hold less water.

scholarly journals Regime and dynamics of soil moisture in forest ecosystems of Záhorská lowland

2012 ◽  
Vol 52 (No. 3) ◽  
pp. 108-117
Author(s):  
L. Tužinský
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Forest Ecosystems ◽  
Soil Moisture Content ◽  
Atmospheric Precipitation ◽  
Sandy Soils ◽  
Growing Seasons ◽  
The Town ◽  
Water Holding ◽  
Wilting Point

The paper describes the regime and dynamics of the soil moisture content of sandy soils in Z&aacute;horsk&aacute; lowland during different growing seasons. Research plots are situated near Kamenn&yacute; mlyn, approximately 3 km from Plaveck&yacute; &Scaron;tvrtok and 8 km southward from the town of Malacky. Changes in the soil moisture content are described by soil moisture constants (MCC, PDA, WP) and its relation to atmospheric precipitation and to the character of undergrowth is shown. The low water-holding capacity of sandy soils and their high drainage together with dense root system do not allow the sufficient saturation of soil during the growing season. The low wilting point value (2%) leads to the consumption of all available water in the soil. The most frequent is the semiarid interval of soil moisture (PDA &ndash;WP) with reduced availability of water to plants (&gt; pF 3.1). The arid interval (&lt; WP) occurrence on hot summer days results in a decrease in transpiration and assimilation intensity of plants, their physiological weakening and premature fall of assimilation organs.&nbsp;

scholarly journals Effect of Water Quality and Date Palm Biochar on Evaporation and Specific Hydrological Characteristics of Sandy Soil

Agriculture ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 300
Author(s):  
Arafat Alkhasha ◽  
Abdulrasoul Al-Omran ◽  
and Abdulaziz G. Alghamdi
Keyword(s):  
Water Quality ◽  
Soil Moisture ◽  
Hydraulic Conductivity ◽  
Date Palm ◽  
Saline Water ◽  
Sandy Soils ◽  
Infiltration Rate ◽  
Hydrological Characteristics ◽  
Arid Conditions ◽  
Cumulative Infiltration

Experiments were conducted in a soil laboratory using transparent columns (5 and 40 cm in diameter and length, respectively) to evaluate the effects of water quality (i.e., fresh or saline water) with the addition of biochar on soil moisture characteristics. Soil and biochar were gently combined and added into the top 10 cm of each column at a rate of 2%, 4%, 6%, and 8% (w/w). The results show a decrease in cumulative evaporation by 29.27%, 16.47%, 14.17%, and 14.61% with freshwater, and by 21.24%, 12.22%, 21.08%, and 12.67% with saline water for B1, B2, B3, and B4, respectively, compared with unamended soil (B1, B2, B3 and B4 represent the treatments with the biochar rate of 2, 4, 6, and 8%, respectively). Cumulative infiltration was reduced by 34.38%, 43.37%, 58.89%, and 57.07% with freshwater, and by 30.18%, 44.38%, 54.44%, and 49.11% with saline water for B1, B2, B3, and B4, respectively. The infiltration rate was reduced by 32.73%, 42.17%, 57.82%, and 56.85% with freshwater, and 42.09%, 54.6%1, 62.68%, and 58.41% with saline water for T1, T2, T3, and T4, respectively, compared with the control. The saturated hydraulic conductivity of B1 decreased significantly by 92.8% and 67.72% with fresh and saline water, respectively. Biochar, as a soil conditioner, could be used in arid conditions with fresh and saline water to enhance the hydrological properties of sandy soils.

scholarly journals Microflora of degraded desert-sandy soils in the case of Uzbekistan

2021 ◽  
Vol 244 ◽  
pp. 02007
Author(s):  
Normamat Namozov ◽  
Mirzabek Tursinbaev ◽  
Iskandar Yuldoshev ◽  
Sakhibabonu Yuldasheva
Keyword(s):  
Soil Moisture ◽  
Environmental Conditions ◽  
Seasonal Dynamics ◽  
Rapid Development ◽  
Sandy Soils

This article presents the results of a study conducted by desert-sandy soils. In the studied desert-sandy soils rapid development of the studied microorganisms was observed mainly in the spring. Mushrooms, ammonificators and oligonitrophilic are sensitive in terms of optimal soil moisture, therefore increasing the number of them observed in the wet periods of the year. Actinomycetes are easier to tolerate unfavorable environmental conditions than other groups of microorganisms, therefore, their seasonal dynamics were insignificant.

scholarly journals Soil moisture redistribution and its effect on inter-annual active layer temperature and thickness variations in a dry loess terrace in Adventdalen, Svalbard

2016 ◽  
Author(s):  
C. Schuh ◽  
A. Frampton ◽  
H. H. Christiansen
Keyword(s):  
Soil Moisture ◽  
Layer Thickness ◽  
Active Layer ◽  
Field Data ◽  
Large Field ◽  
Thickness Variation ◽  
Unfrozen Water ◽  
Active Layer Thickness ◽  
Retention Characteristics ◽  
Moisture Redistribution

Abstract. High resolution field data for the period 2000–2014 consisting of active layer and permafrost temperature, active layer soil moisture, and thaw depth progression from the UNISCALM research site in Adventdalen, Svalbard, is combined with a physically-based coupled cryotic and hydrogeological model to investigate active layer dynamics. The site is a loess-covered river terrace characterized by dry conditions with little to no summer infiltration and an unsaturated active layer. A range of soil moisture characteristic curves consistent with loess sediments are considered and their effects on ice and moisture redistribution, heat flux, energy storage through latent heat transfer, and active layer thickness is investigated and quantified based on hydro-climatic site conditions. Results show that soil moisture retention characteristics exhibit notable control of ice distribution and circulation within the active layer by cryosuction subject to seasonal variability and site-specific surface temperature variations. The retention characteristics also impact unfrozen water and ice content in the permafrost. Although these effects lead to differences in thaw progression rates, the resulting inter-annual variability in active layer thickness is not large. Field data analysis reveals that variations in summer degree days do not notably affect the active layer thaw depths; instead, a cumulative winter degree day index is found to more significantly control inter-annual active layer thickness variation at this site. A tendency of increasing winter temperatures is found to cause a general warming of the subsurface down to 10 m depth (0.05 to 0.26 ˚C/yr, observed and modelled) including an increasing active layer thickness (0.8 cm/yr, observed and 0.3 to 0.8 cm/yr, modelled) during the 14-year study period.

Soil moisture redistribution as a mechanism of facilitation in savanna tree–shrub clusters

Oecologia ◽  
2005 ◽  
Vol 145 (1) ◽  
pp. 32-40 ◽  
Author(s):  
C. B. Zou ◽  
P. W. Barnes ◽  
S. Archer ◽  
C. R. McMurtry
Keyword(s):  
Soil Moisture ◽  
Moisture Redistribution

Responses of Sugarcane to Supplementary Irrigation on Two Soils in Natal

1967 ◽  
Vol 3 (3) ◽  
pp. 223-238 ◽  
Author(s):  
G. D. Thompson ◽  
J. M. Gosnell ◽  
P. J. M. de Robillard
Keyword(s):  
Soil Moisture ◽  
Irrigation Water ◽  
Sandy Soils ◽  
Soil Moisture Deficit ◽  
Neutron Probe ◽  
Moisture Deficit ◽  
Supplementary Irrigation ◽  
Maximum Water ◽  
Water Treatments ◽  
Wilting Point

SummarySupplementary irrigation experiments were conducted on a Clansthal sand and a Windermere clay. Irrigation treatments were based on the application of 1 inch of water when the soil moisture deficit reached 2·5, 3·5, 4·5 and 5·5 in. in 7 ft of soil on the sand, and 1·00, 1·75, 2·50 and 3·25 in. in 2 ft of soil on the clay. Each experiment included a dryland control and soil moisture was estimated weekly in each plot with a neutron probe. The results showed that there were significant linear increases in yield with increasing quantities of water applied. The crops exploited soil moisture to a depth of 6 ft in the sand and 3 ft in the clay, even with the maximum water treatments. Under dryland conditions, on the sand the crop exploited soil moisture to the wilting point only in the surface foot of soil, but on the clay the crop extracted moisture held at tensions greater than 15 bars in the top 3 ft of soil. The conclusions are that, where available water for supplementary irrigation is limited, heavy soils should be irrigated in preference to sandy soils, and that the most efficient use of both rainfall and irrigation water is achieved when 1 cusec is used to irrigate about 200 acres.

In Situ Comparison of Three Dielectric Soil Moisture Sensors in Drip Irrigated Sandy Soils

2005 ◽  
Vol 4 (4) ◽  
pp. 1037-1047 ◽  
Author(s):  
Finn Plauborg ◽  
Bo V. Iversen ◽  
Poul E. Laerke
Keyword(s):  
Soil Moisture ◽  
Sandy Soils ◽  
Soil Moisture Sensors
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