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A new subsurface ceramic emitter for smallholders without pumps: design, hydraulic performance, and field application

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Abstract

Dryland water resource scarcity has been the most challenging issue facing the continuous development of irrigated agricultural systems. Although drip irrigation, especially subsurface drip irrigation (SDI) technology, reduced water loss from soil evaporation and increased water use efficiency (WUE), drip emitter with pumps brought large electric energy consumption and management cost, limiting its application for smallholders in dryland. Therefore, a new subsurface ceramic emitter (SCE) without using pumps, which consisted of a porous ceramic diaphragm, plastic washers, and plastic shells, was designed for smallholders in this study. Then its application effects were estimated using hydraulic, soil bin, pot, and field experiments. The results showed that the discharge of SCE in the air had a positive linear relationship with the working water head. The discharge of SCE in soil presented a power function relationship with the working water head, and the discharge exponent was 0.40. It was recommended that SCE should install at flat farmland with a topographic slope less than ± 5‰ to acquire an acceptable coefficient of uniformity (CU) under the working water head of more than 40 cm. A field experiment in Northwest China showed that SCE with a working water head of 60 cm created a suitable water moisture environment and CU, improving fruit yield and WUE of wolfberry. This provided an alternative irrigation method using SCE with a lower working water head for smallholders in dryland while ensuring a good CU.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (52079131).

Funding

This study was supported by National Natural Science Foundation of China, 52079131.

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XL was involved in investigation, writing—original draft, and language. MH was responsible for data collection, writing—original draft, and language. LZ performed supervision, funding acquisition, and writing—review and editing.

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Correspondence to Lin Zhang.

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Liu, X., Han, M. & Zhang, L. A new subsurface ceramic emitter for smallholders without pumps: design, hydraulic performance, and field application. Irrig Sci 41, 835–845 (2023). https://doi.org/10.1007/s00271-023-00877-4

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  • DOI: https://doi.org/10.1007/s00271-023-00877-4

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