Recycled wastewater was superior among the three WQ for achieving a better crop growth, yield and water productivity at same DI level.Ĭucumbers were planted in soilless media in a split plot design with three replicates under a naturally ventilated greenhouse to study nutrient and water use efficiency in relation to fertigation management. A DI regime based on 80% FC could be an efficient irrigation strategy particularly in water-limiting condition. However, mild water stress (SMC maintaining at 80% FC) showed a positive effect on irrigation water use efficiency (IWUE) without significant yield reduction compared to control. The highest values of plant height (186.0 ± 0.58 cm) and stem diameter (23.40 ± 0.02 mm) were found at 100% FC (control). Results showed that both DI and WQ had significant effects on crop development, yield and water productivity. Three WQ: (groundwater, recycled wastewater and a mix of both) were applied in four irrigation scenarios which targeted soil moisture content (SMC) maintaining at 60%, 70%, 80% and 100% of field capacity (FC). A pot-based experiment was carried out over two growing seasons. This study deals with the evaluation of the effects of deficit irrigation (DI) and water quality (WQ) on the vegetative and productive response of greenhouse-grown tomatoes (Lycopersicon esculentum Mill. The payback period of the investment in nethouse cultivation of tomato using drip irrigation was found out to be one and a half years (three seasons) by which time the system became beneficial. In water scarcity areas and where the land availability is not a constraint, drip irrigation at 60% ET could be resorted to as it would command an additional area of 0.32 ha (using the same quantity of water consumed in 100% ET per ha) and fetch an increased net return of Rs. However, where the availability of FYM is limited, vermicompost with 100% ET could be applied to obtain a net return of Rs. 3,62,016 per ha could be obtained by the application of FYM using drip irrigation at 100% ET with a benefit-cost (BC) ratio of 5.19. The study showed that the maximum net return of Rs. Within the drip irrigation treatments, the highest WUE of 11.90 t ha.cm -1 was obtained under the treatment of irrigation at 60% and the least in 120% ET (7.45 t ha.cm -1). Among the nutrient sources, the farmyard manure (FYM) treatment gave the maximum water use efficiency (WUE) of 10.40 t ha.cm -1 and the lowest was obtained in case of chemical fertilizers (9.12 t ha.cm -1). The mean application efficiency of the system was 91.75%, while the mean distribution efficiency was 94.27%. A field experiment conducted at the Regional Agricultural Research Station, Raichur (Karnataka) during summer 2005 revealed that, the total water requirements for tomato under nethouse conditions using 60, 80, 100 and 120% evapotranspiration (ET) levels of drip irrigation were 52.720, 61.451, 69.607 and 79.524 L per plant respectively.
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