TAILIEUCHUNG - Water Conservation Part 4

Tham khảo tài liệu 'water conservation part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 36 Water Conservation Determination of total suspended solids TSS Total suspended solids TSS analytical test was employed to determine current or future potential emitters clogging problems arising from poor water quality. Water samples were taken from representative three different shallow wells after operating the motor pump assumed as the worst case of water physical quality during water delivery moment in time. Taking into consideration the recommendation given by Clesceri et al. 1998 a 250 ml of water samples from each selected shallow wells were taken and oven dried at 105 c for 1 hour at the Soil Physics Laboratory Mekelle University. The TSS was then calculated using Equation 5 and evaluated based on the Water Quality Guidelines developed by Hanson et al. 1994 A - B x 1000 TSS MM m 5 Where A weight of filter dried residue mg and B weight of filter mg . Evaluation of the water supply-demand for FDI system for selected test crops Assessment of the existing water supply and the crop water requirements of the two dominantly cultivated crops onion and tomato as test crops were done. The total amount of water supplied to each crop throughout the growing season was assessed by multiplying the amount of water applied per irrigation and the frequency of irrigation. The daily volume of water supplied by the farmer to the test crops were taken from farmers current operation practice. The irrigation frequency was found to be two times per day one in the morning and the other in evening with total daily supply volume of water. Taking into account reference evapo-transpiration ETo crop type length of growth growth stage and effective rainfall gross irrigation requirement was computed for the two test crops. An average daily ETo mm day as determined by Haftay 2009 was used for this study. The crop water requirement for the two test crops was estimated by applying Equation 6 given as ETc ET0 X K 6 Where ETc crop evapotranspiration ETo reference .

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