SOME EFFECTS OF WATERLOGGING AND SUPPLY OF COMBINED NITROGEN ON SOYBEAN GROWTH

1987 ◽  
Vol 67 (1) ◽  
pp. 69-77 ◽  
Author(s):  
B. R. BUTTERY
Keyword(s):  
Nitrogen Fixation ◽  
Fine Structure ◽  
Glycine Max ◽  
Water Table ◽  
Deleterious Effect ◽  
High Water ◽  
High Water Table ◽  
Atp Production ◽  
Combined Nitrogen ◽  
Glycine Max L

Five pot tests were conducted on the effects of waterlogging on soybean (Glycine max (L.) Merr.) growth in the presence or absence of nitrate. Plants grown outdoors in sand and a vermiculite/perlite mixture (V/P) gave relative weights of 75 and 100 in the presence of nitrate and 3 and 38 in its absence. In a growth chamber similar treatments produced values of 95 and 100 with nitrate, and 28 and 58 without nitrate. Soybeans in V/P flooded by preventing outflow (ST) or normally drained (D), gave relative weights in the ST and D treatments of 76 and 100 in the presence of nitrate, and 27 and 55 in its absence. Averaged over 21 cultivars, treatments of ST and D with nitrate, and of ST and D without nitrate gave values of 111, 100, 66 and 85. Differences between cultivars in reaction to flooding were small. Soybeans were also grown in V/P flooded by immersing pots in buckets of nutrient solution filled to the top of the pot (FB) or to a constant high water table, 85 mm below the pot surface (HB). Relative plant weights of 22, 100, 45 and 198 were obtained with nitrate, and 17, 79, 10 and 138 with no nitrate for ST, D, FB and HB treatments. All five experiments suggest that reduced availability of oxygen because of fine structure of the substrate or because of direct flooding has a more deleterious effect on soybean growth in the absence of combined N than in its presence. A high water table benefited soybean growth in comparison with normally watered and drained plants. The effects of respiration rate on speed of development of anoxic conditions, and the effects of nitrate on ATP production in both nodules and root tissue are discussed.Key words: Soybean, Glycine max (L.) Merr., waterlogging, combined nitrogen, nitrogen fixation, substrate aeration

Soil behavior and related effects in the Peru earthquake of May 31, 1970

1971 ◽  
Vol 61 (3) ◽  
pp. 579-590 ◽  
Author(s):  
William Enkeboll
Keyword(s):  
Water Table ◽  
High Water ◽  
Soil Behavior ◽  
High Water Table ◽  
Water Conditions ◽  
Degree Of Damage ◽  
Soil And Water

abstract Soil and water conditions had an effect on the degree of damage to structures. Most structures were located on alluvium with a high water table. Settlements occurred in dike and causeway fill in Chimbote harbor. Severe problems to communication occurred in some areas through embankment failures and road slides.

scholarly journals Evaluating the influence of water table depth on transpiration of two vegetation communities in a lake floodplain wetland

2016 ◽  
Vol 47 (S1) ◽  
pp. 293-312 ◽  
Author(s):  
Xiuli Xu ◽  
Qi Zhang ◽  
Yunliang Li ◽  
Xianghu Li
Keyword(s):  
Water Table ◽  
Growth Stage ◽  
High Water ◽  
Water Table Depth ◽  
Floodplain Wetlands ◽  
Floodplain Wetland ◽  
Vegetation Communities ◽  
High Water Table ◽  
Potential Transpiration ◽  
Main Growth

Groundwater plays an important role in supplying water to vegetation in floodplain wetlands. Exploring the effect of water table depth (WTD) on vegetation transpiration is essential to increasing understanding of interactions among vegetation, soil water, and groundwater. In this study, a HYDRUS-1D model was used to simulate the water uptake of two typical vegetation communities, Artemisia capillaris and Phragmites australis, in a floodplain wetland (Poyang Lake wetland, China). Vegetation transpiration was compared for two distinct hydrological conditions: high water table (2012) and low water table (2013). Results showed that vegetation transpiration in the main growth stage (July–October) was significantly influenced by WTD. Under high water table conditions, transpiration of A. capillaris and P. australis communities in the main growth stage totaled 334 and 735 mm, respectively, accounting for over 90% of the potential transpiration. Under low water table conditions, they decreased to 203 and 510 mm, respectively, due to water stress, accounting for merely 55% of the potential transpiration. Scenario simulations found different linear relationships between WTD and the ratio of groundwater contribution to vegetation transpiration. An increase of 1 m in WTD in the main growth stage may reduce the ratio by approximately 25%.

scholarly journals IRRIGATION MANAGEMENT FOR DOUBLE-CROPPED FRESH-MARKET TOMATOES ON A HIGH-WATER-TABLE SOIL

1991 ◽  
Vol 34 (6) ◽  
pp. 2445-2452
Author(s):  
C. R. Camp ◽  
M. L. Robbins ◽  
D. L. Karlen ◽  
R. E. Sojka
Keyword(s):  
Water Table ◽  
Irrigation Management ◽  
High Water ◽  
Fresh Market ◽  
High Water Table

Design of a hydrodynamic leachate containment system

1989 ◽  
Vol 16 (5) ◽  
pp. 615-626 ◽  
Author(s):  
M. D. Haug ◽  
D. J. L. Forgie ◽  
S. L. Barbour
Keyword(s):  
Contaminant Transport ◽  
Water Table ◽  
High Water ◽  
Groundwater Table ◽  
Cutoff Wall ◽  
Transport Modelling ◽  
High Water Table ◽  
Cutoff Walls ◽  
A Site

This paper presents the design concept for a case study sanitary landfill on a site that would not normally have been approved owing to the presence of a high water table. In this design, the base of the landfill was intentionally placed below the water table. A massive 2.5 m wide, 2.5 m high cutoff wall and a 0.3 m thick liner with hydraulic conductivities of approximately 5 × 10−10 m/s were constructed of recompacted glacial till to limit both groundwater intrusion into the landfill and leachate migration out of the landfill. In this case study, the landfill base was placed below the water table to (i) provide a relatively inexpensive source of cover material and (ii) use the hydrodynamic gradient from the high water table to help contain the leachate. Finite element modelling of the seepage and contaminant transport, for alternate designs for lined and unlined landfills placed above and below the groundwater table, is shown to confirm a previous, less-sophisticated, estimation that placing a lined landfill below the groundwater table has definite advantages in reducing both leachate seepage and contaminant transport. Key words: landfill, leachate, hydrodynamic containment, liners, compacted earth cutoff walls, seepage and contaminant transport modelling.

Thermal regime of mollisols under high water-table conditions

1979 ◽  
Vol 20 (6) ◽  
pp. 493-505 ◽  
Author(s):  
R.P. Tripathi ◽  
B.P. Ghildyal
Keyword(s):  
Water Table ◽  
Thermal Regime ◽  
High Water ◽  
High Water Table
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