Effects of drip irrigation frequency on soil wetting pattern and potato growth in North China Plain |
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| Institution: | 1. Center for Agricultural Water Research in China, China Agricultural University, No. 17 Qinghua East Road, Haidian, Beijing 100083, China;2. Institute of Geographical Sciences and Natural Resource Research, Chinese Academy of Sciences, Beijing 100101, China;1. Litani River Basin Management Support (LRBMS) Program, Bechara El Khoury Street, Ghannajeh Building, 5th Floor, P.O. Box 11 3732, Beirut, Lebanon;2. Litani River Authority, Department of Environment, Bechara El Khoury Street, Ghannajeh Building, 5th Floor, P.O. Box 11 3732, Beirut, Lebanon;3. International Center for Higher Mediterranean Agricultural Studies, Via Ceglie 9, 70010 Valenzano, Bari, Italy;4. Università degli studi di Firenze, Dipartimento di Economia Agraria (DEART), Piazzale delle Cascine 18, 50127 Firenze, Italy;5. Centro Regional de Estudios del Agua (CREA), Universidad de Castilla-La Mancha, Ctra. de las Peñas, km 3.2, 02071 Albacete, Spain;1. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR-Provincia de La Rioja-UNLaR, SEGEMAR-UNCa-CONICET), Entre Ríos y Mendoza s/n, Anillaco (5301), La Rioja, Argentina;2. Departamento de Ciencias Exactas, Físicas y Naturales (DACEFyN), Universidad Nacional de La Rioja, Av. Luis M. de la Fuente s/n, Ciudad Universitaria de la Ciencia y de la Técnica, La Rioja (5300), La Rioja, Argentina;3. Agencia de Extensión Rural Aimogasta, Instituto Nacional de Tecnología Agropecuaria (INTA), Ruta Nacional 60, Aimogasta (5310), La Rioja, Argentina;1. Trees and Timber Institute, National Research Council (CNR-IVALSA) Via P. Gaifami 18, 95126, Catania, Italy;2. Department of Agriculture, Food and Environment (Di3A), University of Catania, Via Valdisavoia 5, 95123, Catania, Italy;1. Department of Biological and Agricultural Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400, Serdang, Selangor Darul Ehsan, Malaysia;2. Dams and Water Resources Engineering Department, College of Engineering, University of Mosul, 41002, Mosul, Iraq;1. University of Kurdistan, Agriculture Faculty, Water Eng. Dept., Sanandaj, Iran;2. University of Tehran, College of Agriculture and Natural Resources, Department of Irrigation and Reclamation Engineering, Karaj, Tehran, Iran;3. Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam;4. Sustainable Developments in Civil Engineering Research Group, Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Viet Nam |
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| Abstract: | The effect of irrigation frequency on soil water distribution, potato root distribution, potato tuber yield and water use efficiency was studied in 2001 and 2002 field experiments. Treatments consisted of six different drip irrigation frequencies: N1 (once every day), N2 (once every 2 days), N3 (once every 3 days), N4 (once every 4 days), N6 (once every 6 days) and N8 (once every 8 days), with total drip irrigation water equal for the different frequencies. The results indicated that drip irrigation frequency did affect soil water distribution, depending on potato growing stage, soil depth and distance from the emitter. Under treatment N1, soil matric potential (ψm) Variations at depths of 70 and 90 cm showed a larger wetted soil range than was initially expected. Potato root growth was also affected by drip irrigation frequency to some extent: the higher the frequency, the higher was the root length density (RLD) in 0–60 cm soil layer and the lower was the root length density (RWD) in 0–10 cm soil layer. On the other hand, potato roots were not limited in wetted soil volume even when the crop was irrigated at the highest frequency. High frequency irrigation enhanced potato tuber growth and water use efficiency (WUE). Reducing irrigation frequency from N1 to N8 resulted in significant yield reductions by 33.4 and 29.1% in 2001 and 2002, respectively. For total ET, little difference was found among the different irrigation frequency treatments. |
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