Soil Water Dynamics of Shallow Water Table Soils Cultivated With Potato Crop

SUMMARYDeep sowing (15 cm) on sands in the dry season is a practice used in post-rice sowing of legumes without irrigation, designed to increase moisture access for germination, growth and crops yield. However, with such deep sowing there can be a penalty for emergence and growth if there is abundant water stored in the upper soil profile during the growing season. Hence, there is a need to define the soil water regimes under which deep sowing is advantageous for different legumes. To investigate the adaptation of legume crop species to deep sowing, we studied their emergence, growth and yield on three deep soils (3–16% clay) with shallow water tables during two years in northeast Thailand. At site 1 and 2, peanut, cowpea, mungbean and soybean were sown shallow (~5 cm) or deep (~15 cm). At site 3, only cowpea and peanut were shallow or deep sown. Shallow water tables maintained soil water content (0–15 cm) above permanent wilting point throughout the growing season. Deep sowing of all legumes delayed emergence by 3–7 days at all locations. Shoot dry weight of legumes after deep sowing was mostly similar or lower than weight after shallow sowing. Yield and harvest index of legumes did not differ meaningfully among sowing depths. Therefore, deep sowing was not beneficial for dry season cropping without irrigation when there was a shallow water table and sufficient water for crop growth throughout soil profiles in the growing season. Taken together with previous studies, we conclude that shallow rather than deep sowing of legumes was preferred when the soil water content at 0–15-cm depth remained higher than permanent wilting point throughout the growing season due to shallow water table.

Download Full-text

Reclamation for aspen revegetation in the Athabasca oil sands: Understanding soil water dynamics through unsaturated flow modelling

Canadian Journal of Soil Science ◽

10.4141/cjss2010-035 ◽

2012 ◽

Vol 92 (1) ◽

pp. 103-116 ◽

Cited By ~ 16

Author(s):

J. J. Carrera-Hernández ◽

C. A. Mendoza ◽

K. J. Devito ◽

R. M. Petrone ◽

B. D. Smerdon

Keyword(s):

Soil Water ◽

Water Table ◽

Oil Sands ◽

Unsaturated Flow ◽

Water Dynamics ◽

Soil Water Dynamics ◽

Natural Conditions ◽

Athabasca Oil Sands ◽

Flow Modelling ◽

The Impact

Carrera-Hernández, J. J., Mendoza, C. A., Devito, K. J., Petrone, R. M. and Smerdon, B. D. 2012. Reclamation for aspen revegetation in the Athabasca oil sands: Understanding soil water dynamics through unsaturated flow modelling. Can. J. Soil Sci. 92: 103–116. Reclamation of mined areas in the Athabasca oil sands region is required by law, with the ultimate goal of revegetating to species characteristic of predisturbance native plant communities. To develop adequate reclamation strategies, an analysis of soil water dynamics is of utmost importance, as is understanding the impact of the thickness of the reclamation cover. In this work, soil water dynamics and fluxes at the water table were simulated for three reclamation scenarios and compared with the fluxes obtained for natural conditions assuming that aspen is the target reclamation species. According to the simulations, a reclamation thickness between 0.5 and 1.0 m can be used to provide water for revegetation. The numerical simulations show that the reclaimed landscapes have fluxes at the water table that exhibit less fluctuation than natural conditions. To limit the interaction between the water table and atmospheric fluxes, and to limit upward flux, the water table should be deeper than 2.0 m on reclaimed landscapes that use aspen for revegetation, particularly when reclamation takes place during a dry climatological cycle.

Download Full-text

Supplementary material to "Shallow water table effects on water, sediment and pesticide transport in vegetative filter strips: Part A. non-uniform infiltration and soil water redistribution"

10.5194/hess-2017-405-supplement ◽

2017 ◽

Author(s):

Rafael Muñoz-Carpena ◽

Claire Lauvernet ◽

Nadia Carluer

Keyword(s):

Shallow Water ◽

Soil Water ◽

Water Table ◽

Shallow Water Table ◽

Vegetative Filter Strips ◽

Filter Strips ◽

Pesticide Transport ◽

Water Redistribution ◽

Supplementary Material

Download Full-text

Comments on "Shallow water table effects on water, sediment and pesticide transport in vegetative filter strips: Part A. non-uniform infiltration and soil water redistribution"

10.5194/hess-2017-405-rc3 ◽

2017 ◽

Author(s):

Anonymous

Keyword(s):

Shallow Water ◽

Soil Water ◽

Water Table ◽

Shallow Water Table ◽

Vegetative Filter Strips ◽

Filter Strips ◽

Pesticide Transport ◽

Water Redistribution

Download Full-text

Soil water storage dynamics in peatlands with shallow water tables

Canadian Journal of Soil Science ◽

10.4141/s99-007 ◽

2000 ◽

Vol 80 (1) ◽

pp. 43-52 ◽

Cited By ~ 12

Author(s):

David R. Lapen ◽

Jonathan S. Price ◽

Robert Gilbert

Keyword(s):

Shallow Water ◽

Soil Water ◽

Water Table ◽

Time Domain ◽

Water Storage ◽

Time Domain Reflectometry ◽

Soil Water Storage ◽

Shallow Water Table ◽

Moisture Conditions ◽

Peat Formation

Time domain reflectometry (TDR) was used to estimate soil water storage dynamics in several uncultivated blanket bogs and poor fens in southeastern Newfoundland during the summer growing season. The purpose of the research was to evaluate links between surface moisture conditions, evapotranspiration, and recharge processes in order to elucidate factors that govern blanket peat formation in the region. Water storage changes in the peat/Sphagnum above the water table (ΔSWS) were found to be important storage terms in daily water balance estimates. Daily mean ΔSWS values for bog and fen approximated −0.3 and −0.45 mm, respectively. It was also found that, i) fairly high peat water-holding capacities, ii) frequent atmospheric recharge, iii) atmospheric controls on evapotranspiration, and, iv) the transport of water into the unsaturated zone from the shallow water table via capillary and external wicking processes helped to preclude significant de-watering over the bulk of the peatland surfaces. Recharge via groundwater appears to be an important factor governing moisture conditions requisite for peat accrual and the growth of Sphagnum spp., especially in the fens. Key words: Time domain reflectometry, blanket peats, soil water, evapotranspiration, water table depth

Download Full-text

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.864-867.2298 ◽

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.

Download Full-text