scholarly journals Simulating the effects of different potassium and water supply regimes on soil water content and water table depth over a rotation of a tropical Eucalyptus grandis plantation

2018 ◽  
Vol 418 ◽  
pp. 4-14 ◽  
Author(s):  
M. Christina ◽  
G. le Maire ◽  
Y. Nouvellon ◽  
R. Vezy ◽  
B. Bordon ◽  
...  
Keyword(s):  
Water Supply ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Table ◽  
Eucalyptus Grandis ◽  
Water Table Depth

scholarly journals Corn and Velvetleaf (Abutilon theophrasti) Transpiration in Response to Drying Soil

Weed Science ◽  
2011 ◽  
Vol 59 (1) ◽  
pp. 50-54 ◽  
Author(s):  
Jared J. Schmidt ◽  
Erin E. Blankenship ◽  
John L. Lindquist
Keyword(s):  
Drought Stress ◽  
Water Supply ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Crop Yield ◽  
Field Capacity ◽  
Valuable Insight ◽  
Dry Down ◽  
Daily Transpiration

Soil water availability is the most important factor limiting crop yield worldwide. Understanding crop and weed transpiration in response to water supply may provide valuable insight into the mechanisms of crop yield loss in water-limited environments. A greenhouse experiment was conducted to quantify corn and velvetleaf transpiration in response to drying soil. Five plants of each species were well watered by adding back the equivalent water loss each day to reach field capacity, and five plants were subjected to drought stress (dry-down) by not replacing lost water. Normalized daily transpiration of dry-down plants was regressed on soil water content expressed as the fraction of transpirable soil water (FTSW). The critical soil water content below which plants begin to close their stomates occurred at FTSWcr= 0.36 ± 0.015 for corn and 0.41 ± 0.018 for velvetleaf. Total water transpired did not differ among species. Velvetleaf also responded to drought by senescing its oldest leaves, whereas corn mainly maintained its leaf area but with rolled leaves during peak drought stress. During a short-term drought, corn is expected to perform better than velvetleaf because it maintains full transpiration to a lower FTSW and does not senesce its leaves. Under severe long-term drought, the species that closes its stomates at greater FTSWcrwill conserve water and increase its chances of survival. Moreover, senescing all but the youngest leaves may ensure at least some seed production. Research is needed to evaluate the effects of soil water supply on corn–velvetleaf interference in the field.

scholarly journals On the Relation of No-water-supply Days to Survival Percent and Soil Water Content in Trees for Landscaping

1986 ◽  
Vol 50 (5) ◽  
pp. 155-160 ◽  
Author(s):  
Chikayasu HAMANO ◽  
Tadashi KOGA ◽  
Yoshimitsu AOKI ◽  
Kiyoshi KITAZAWA
Keyword(s):  
Water Supply ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content

Comparison between Soil Water Dynamics Simulated by the Isothermal and Non-Isothermal Models

2013 ◽  
Vol 864-867 ◽  
pp. 2298-2301
Author(s):  
Jiang Bo Han ◽  
Zhi Fang Zhou
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Table ◽  
Water Dynamics ◽  
Soil Water Dynamics ◽  
Isothermal Model ◽  
Dynamic Variations ◽  
Soil Temperatures ◽  
One Year

To obtain a better understanding of the role of non-isothermal flow in the unsaturated zone in the presence of the water table, the isothermal and non-isothermal models driven by the observed atmospheric data were used to reproduce soil moisture dynamics observed in the lysimeter with a 100-cm water table level over one year period. Results from the simulations indicated that although the isothermal and non-isothermal models both captured the general trend of soil water content dynamics during one year period, simulated values by the isothermal model presented less dynamic variations, which overestimated the soil water content during the rainy season and underestimated it during other periods. On the other hand, the non-isothermal model not only reproduced well the seasonal variations of soil temperatures but also reproduced more reasonably soil water dynamics in the whole profile and during the whole simulation period.

The effects of drainage on substrate water content at several forested Alberta peatlands

1996 ◽  
Vol 26 (1) ◽  
pp. 53-62 ◽  
Author(s):  
R.L. Rothwell ◽  
U. Silins ◽  
G.R. Hillman
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Table ◽  
Tree Growth ◽  
Soil Conditions ◽  
Drainage Ditch ◽  
Sampling Locations ◽  
Soil Water Conditions ◽  
And Performance

Hydrologic drainage criteria that describe the position of the water table between adjacent ditches are commonly used to assess the initial effectiveness of peatland drainage projects for tree growth improvement. However, these criteria do not reflect the soil conditions that regulate tree growth and performance after drainage. The effect of three drainage ditch spacings (30, 40, and 50 m) on the spatial variability of soil water conditions at three drained boreal Alberta peatlands was studied. Soil water content (0–30 cm depth) was found to be insensitive (p = 0.686) to drainage ditch spacing several years after drainage. Greater variation was observed between different sampling locations (p = 0.024) relative to the position of the ditch edge within similar ditch spacings. Spatial distribution of soil water in the unsaturated zone was found to be inversely related to the degree of water table lowering. Spatial patterns of soil water content were strongly associated with changes to substrate bulk density resulting from post-drainage peatland subsidence.

scholarly journals A calculation method of available soil water content : application to viticultural terroirs mapping of the Loire valley

OENO One ◽  
2004 ◽  
Vol 38 (4) ◽  
pp. 231
Author(s):  
Etienne Goulet ◽  
René Morlat ◽  
Dominique Rioux ◽  
S. Cesbron
Keyword(s):  
Water Supply ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Field Capacity ◽  
Geographical Information ◽  
Rooting Depth ◽  
Wine Quality ◽  
Available Water Content ◽  
Loire Valley

<p style="text-align: justify;">Vine water supply is one of the most important elements in the determination of grape composition and wine quality. Water supply conditions are in relation with available soil water content, therefore this one has to be determined when vineyard terroir mapping is undertaken. The available soil water content depends on soil factors like water content at field capacity, water content at the permanent wilting point, apparent density and rooting depth. The aim of this study is to seek the relationship between these factors and a simple soil characteristic such as texture which could be easily measurable in routine cartography. Study area is located in the Loire valley, in two different geological regions. First results indicate that it is possible to determine available soil water content from clay percentage, then from soil texture. These results also show that available soil water content algorithms differ with geological properties. This calculation can be used at each auger boring and results can be spatialised within a Geographical Information System that allows the production of available water content maps.</p>

scholarly journals Interaction of soil water and groundwater during the freezing–thawing cycle: field observations and numerical modeling

2021 ◽  
Vol 25 (8) ◽  
pp. 4243-4257
Author(s):  
Hong-Yu Xie ◽  
Xiao-Wei Jiang ◽  
Shu-Cong Tan ◽  
Li Wan ◽  
Xu-Sheng Wang ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Water Content ◽  
Soil Water ◽  
Water Table ◽  
Groundwater Level ◽  
Water Table Depth ◽  
Field Observations ◽  
Initial Water ◽  
Groundwater Inflow ◽  
The Mean

Abstract. Freezing-induced groundwater-level decline is widely observed in regions with a shallow water table, but many existing studies on freezing-induced groundwater migration do not account for freezing-induced water-level fluctuations. Here, by combining detailed field observations of liquid soil water content and groundwater-level fluctuations at a site in the Ordos Plateau, China, and numerical modeling, we showed that the interaction of soil water and groundwater dynamics was controlled by wintertime atmospheric conditions and topographically driven lateral groundwater inflow. With an initial water table depth of 120 cm and a lateral groundwater inflow rate of 1.03 mm d−1, the observed freezing and thawing-induced fluctuations of soil water content and groundwater level are well reproduced. By calculating the budget of groundwater, the mean upward flux of freezing-induced groundwater loss is 1.46 mm d−1 for 93 d, while the mean flux of thawing-induced groundwater recharge is as high as 3.94 mm d−1 for 32 d. These results could be useful for local water resources management when encountering seasonally frozen soils and for future studies on two- or three-dimensional transient groundwater flow in semi-arid and seasonally frozen regions. By comparing models under a series of conditions, we found the magnitude of freezing-induced groundwater loss decreases with initial water table depth and increases with the rate of groundwater inflow. We also found a fixed-head lower boundary condition would overestimate freezing-induced groundwater migration when the water table depth is shallow. Therefore, an accurate characterization of freezing-induced water table decline is critical to quantifying the contribution of groundwater to hydrological and ecological processes in cold regions.

scholarly journals Gogo rice agronomic patterns on water supply variables and light intensity

2021 ◽  
Vol 886 (1) ◽  
pp. 012131
Author(s):  
Siti Aisyah ◽  
Chairani Hanum ◽  
Revandy Iskandar M Damanik
Keyword(s):  
Water Stress ◽  
Light Intensity ◽  
Water Supply ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Block Design ◽  
The Third ◽  
Randomized Block Design ◽  
Number Of Leaves

Abstract The study was aimed to find out the varieties of Gogo rice that are resistence of water supply and the low of light intensity and giving information about the varieties that are resistence of double water stress. The study was conducted on November 2020 to May 2021 and used a Randomized Block Design (RAK) with three factors. The first factor is soil water content of D1 40%, D2 60%, D3 80%., the second is shade intensity of N0 0%, N1 20%, N2 40%, and N3 60%. and the third is the varieties of V1 Situbagendit, V2 Red Sigambiri, V3 Inpago 8, V4 White Sigambiri. The result showed that there were differences of growing in different treatnent where the highest of plant of D3N0V1 is 54,73, the highest number of leaves of D3N0V1 is 7.03 and the highest tillers of D3N0V1 is 6.01. On each lowest observation of D1N2V4, the plants died at the age of 12 mds. The findings of the study showed that the soil water content of 80 %, and shade intensity of 0 % are significant effect on Gogo Varieties of Situbagendit.

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