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Brackish water subirrigation for vegetables
Author(s) -
Patel R. M.,
Prasher S. O.,
Goel P. K.,
Madramootoo C. A.,
Broughton R. S.
Publication year - 2003
Publication title -
irrigation and drainage
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 38
eISSN - 1531-0361
pISSN - 1531-0353
DOI - 10.1002/ird.70
Subject(s) - brackish water , lysimeter , environmental science , salinity , irrigation , soil salinity control , agronomy , water table , soil water , pepper , soil salinity , drainage , hydrology (agriculture) , horticulture , leaching model , groundwater , soil science , geology , biology , ecology , geotechnical engineering
As freshwater resources for irrigation are being depleted rapidly, recent emphasis has been on the development of nonconventional water sources: reuse of agricultural drainage water, use of industrial or municipal wastewater, and use of brackish water for irrigation. Experiments conducted in field lysimeters over three seasons sought to investigate the feasibility of using brackish water for growing moderately sensitive crops. Brackish waters, with salinity levels of 1, 5 and 9 dS m −1 , were used. In 1993 the effects of a factorial combination of three subirrigation water salinity levels, two water table depths and four NPK fertilizer combinations on salt buildup in an initially nonsaline soil and on green pepper ( Capsicum annuum L.) performance were assessed. A gradual increase in soil solution salinity (EC sw ) from the water table to the soil surface was evident; however, throughout the growing season, the EC sw did not reach a level that could seriously damage the crop. There was no significant difference in pepper yields due to either salinity of subirrigation water or water table depth. In 1994, two potato ( Solanum tuberosum L.) cultivars were grown in the soil, which was salinized with 3.5 dS m −1 water before planting tubers. The salt buildup pattern was similar to that observed in 1993; however, the EC sw levels were higher in 1994 due to the higher initial soil salinity. Moreover, a decrease in EC sw was observed near the water table in lysimeters subirrigated with 1 dS m −1 water. For both cultivars, no significant difference in tuber yield was observed due to either water table depth or subirrigation water salinity. In 1995, three potato cultivars were grown in a nonsaline soil as well as a soil presalinized with 2 dS m −1 water. In the topsoil layer, higher rate of increase in EC sw was observed in the saline soil compared to the nonsaline soil. No significant difference in total tuber yield was observed due to either the initial soil salinity levels or subirrigation water salinity levels. Brackish water with salinity levels of up to 9 dS m −1 , when applied through subirrigation, could be used to successfully produce green peppers and potatoes under semiarid to arid conditions. Copyright © 2002 John Wiley & Sons, Ltd.