Abstract
AbstractThis study evaluated the effects of irrigation water management techniques on the growth and yield parameters of madumbe (Colocasia esculenta) irrigated with anaerobic filter (AF) effluent. The irrigation water management treatments considered were alternate wetting and drying (AWD), continuous flooding irrigation (CFI) and wetting without flooding (WWF). It was hypothesized that irrigation techniques with anaerobic baffled reactor (ABR) effluent have a significant effect on the growth and yield of madumbe. The effects of the treatments were significant (P < 0.05) on the number of irrigation events, amount of irrigated water and daily water balance. The treatments had no effect on the growth parameters (plant height, leaf number and leaf area index (LAI) (P > 0.05)). The treatments effects were, however, highly significant (P < 0.001) on the yield components (biomass, corm mass, corm number, corm size, harvest index), corm yield and water productivity (WP). AWD treatments had the highest WP. The highest average corm yields of 7.5 and 9.84 t/ha for WWF treatments for 2017 and 2018 seasons were obtained. It is concluded from this study that both AWD and CFI resulted in yield reduction compared with WWF, and as such, is not recommended to improve the productivity of madumbe.
Highlights
Wastewater is the only potential source of water that will rise as the population increases and the demand for freshwater rises (Heidarpour et al )
The effects of irrigation water management techniques with anaerobic filter (AF) effluent were significant on the total amount of irrigation and total water used (P 1⁄4 0.002)
This study showed that madumbe was susceptible to flooding (CFI)
Summary
Wastewater is the only potential source of water that will rise as the population increases and the demand for freshwater rises (Heidarpour et al ). According to Qadir et al ( ), urban and peri-urban farmers in almost all developing countries have no choice but to use wastewater. Metropolitan population growth, predominantly in developing countries, places enormous stress on water and land resources; as a result, a growing volume of wastewater is. The rate of wastewater usage for irrigated agriculture in urban and peri-urban and even in far rural settlements downstream of the new megacities is increasing.
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