Performance of drip-irrigated dry-seeded rice (Oryza sativa L.) in South Asia

详细信息    查看全文

• 作者：Rakesh Sharda ; Gulshan Mahajan ; Mukesh Siag ; Angrej Singh…
• 关键词：Energy saving ; Micro irrigation ; Root density ; Solar pump ; Water ; use efficiency
• 刊名：Paddy and Water Environment
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：15
• 期：1
• 页码：93-100
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Agriculture; Hydrology/Water Resources; Hydrogeology; Geoecology/Natural Processes; Ecotoxicology; Soil Science & Conservation;
• 出版者：Springer Japan
• ISSN：1611-2504
• 卷排序：15

文摘

Drip irrigation in dry-seeded rice (DSR) is a new water-saving cultivation technology; however, very little is known of its productivity and water-saving capacities. The study was conducted for 2 years (2013 and 2014) in a split-plot design in three replicates with treatment combinations of four irrigation regimes [drip irrigation at 1.5, 2.25, and 3.0× pan evaporation (Epan) and flood irrigation at 3.0× Epan] and three nitrogen (N) levels (120, 150, and 180 kg ha−1). Drip irrigation in DSR resulted in higher grain yield (7.34–8.01 t ha−1) than flood irrigation (6.63–7.60 t ha−1) , with water savings of more than 40 %. Water-use efficiency with drip irrigation was higher (0.81–0.88 kg m−3) than flood irrigation (0.42–0.52 kg m−3) , being highest with drip irrigation at 1.5× Epan. Root density at soil depths of 15–30 cm was also higher in drip (0.86–1.05 mg cm−3) as compared to the flood (0.76–0.80 kg m−3)-irrigated crop. This study implicated that under water-scarce scenario, drip-irrigated DSR is a profitable, and water- and energy-saving technology. This study also suggested that policy focus in future must be tilted towards the promotion of solar-operated drip irrigation in those regions, where DSR is being promoted in the face of water and energy crisis.