Elevation of water table and hydrologic conditions in the Rio Lapa to Rio Majada area, Puerto Rico, for December 1988, and April, July, and October 1989

1990 ◽  
Keyword(s):  
Puerto Rico ◽  
Water Table ◽  
Hydrologic Conditions

Effect of Water Table Depth on the Yield of Seven Sugarcane Varieties in Puerto Rico

1969 ◽  
Vol 60 (2) ◽  
pp. 228-237
Author(s):  
Raúl Pérez Escolar ◽  
William F. Allison
Keyword(s):  
Puerto Rico ◽  
Water Table ◽  
Commercial Production ◽  
Water Table Depth ◽  
Field Conditions ◽  
Sugarcane Varieties ◽  
Effect Of Water ◽  
Actual Field ◽  
Response To Water

The effect of water table depth on yield of sugarcane varieties PR 980, PR 1028, PR 1059, PR 1141, PR 64-610, PR 61-632 and PR 64-2705 was studied in lysimeter tanks in the field. Using plastic drains at varying distances and depths, variety PR 980 was studied on a 5-ha farm. Results obtained show that varieties differ in their response to water table conditions. Varieties PR 980, PR 1059, PR 64-610, PR 61-632 and PR 64-2705 yielded significantly more cane and sugar when the water table was lowered. Varieties PR 1028 and PR 1141 did not show statistically significant differences among treatment differentials. Under actual field conditions, using perforated plastic drains, variety PR 980 yielded significantly more sugar than in undrained plots. The results obtained in the lysimeter tanks are in accord with those observed under commercial production.

Some hydrological effects of peatland drainage in Alberta's boreal forest

1992 ◽  
Vol 22 (11) ◽  
pp. 1588-1596 ◽  
Author(s):  
G.R. Hillman
Keyword(s):  
Water Table ◽  
Black Spruce ◽  
Site Factors ◽  
North Central ◽  
Source Areas ◽  
Flood Duration ◽  
Average Water ◽  
Hydrological Effects ◽  
Hydrologic Conditions ◽  
Average Drop

Ninety hectares in a treed fen in north central Alberta were drained to improve growth of stagnant black spruce (Piceamariana (Mill.) B.S.P.) and tamarack (Larixlaricina (Du Roi) K. Koch) stands. Installation of 30-, 40-, 50-, and 60-m ditch spacings resulted in a lowering of the average water table by 79, 66, 56, and 73 cm, respectively. The results and the groundwater level criteria used (drainage norm, 40 cm; flood duration limit, 14 days) indicated that the 50-m ditch spacing was hydrologically the most appropriate one for this area. Given the relatively high hydraulic conductivity of the area, it is believed the 30-m spacing was too narrow and resulted in an excessively low average water table. The 60-m spacing was also overeffective, but in this case, overeffectiveness was attributed more to "edge effects" i.e., to site factors such as the proximity to uplands and the small size of upstream source areas, than to the distance between ditches. The results illustrate the importance, for ditch network design purposes, of taking into account hydrologic conditions both within and well beyond the boundaries of an area proposed to be drained. Peat subsidence after drainage appeared to be related to the average drop in water table level and amounted to about 5 cm•a−1.

scholarly journals Moisture Retention in the Organic Soils of Caño Tiburones

1969 ◽  
Vol 58 (2) ◽  
pp. 225-229
Author(s):  
Raúl Pérez-Escolar ◽  
J. Juárez, Jr. ◽  
J. A. Bonnet ◽  
M. A. Lugo López
Keyword(s):  
Puerto Rico ◽  
Plant Growth ◽  
Physical Properties ◽  
Life Span ◽  
Water Table ◽  
Large Percentage ◽  
Organic Soils ◽  
Moisture Retention ◽  
Single Body ◽  
Careful Management

Data are presented in this paper from exploratory tests on some of the physical properties of the organic soils of Caño Tiburones, the largest single body of this nature in Puerto Rico. Soils are very light in weight and are capable of retaining a large percentage of moisture at 1/2 and 10 atmospheres of pressure. The volume of water available for plant growth is low because of the high volumes retained when approaching higher tensions. Careful management of the water table might be the key to increased productivity and increased life-span of these valuable soils.

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