Effect of Different Controlled Irrigation and Drainage Regimes on Crop Growth and Water Use in Paddy Rice
Year: 2018
Type: article
Abstract: To achieve the dual goal of water conservation and high grain production, agricultural systems must decrease water usage and increase water use efficiency (WUE).In recent years, controlled irrigation and drainage (CID) has been used and developed as a new water-saving technique for paddy rice production.The present study aimed to explore the influence of different CID regimes on the yield, agronomic traits, and WUE of paddy rice.Treatments included alternate wetting and drying (AWD), CID-I (a lower limit of irrigation to 200 mm), and CID-II (a lower limit of irrigation to 500 mm).Plant height increased but tiller number significantly decreased under CID compared with those under AWD.Implementing CID decreased irrigation water volume (IV) by 9.7%-37.1%,which increased yield irrigation water use efficiency (IWUEy) by 14.6%-51.5%.Under CID-I, grain yield decreased by 2.9% in 2015 and increased by 3.5% in 2016.CID-II obtained marginally, but not significantly, lower yields (4.7% in 2015 and 2.0% in 2015) than AWD because the percent of filled grains (PFG) and spikelets per m 2 (SPM) decreased under this irrigation scheme.IWUEy and biomass irrigation water use efficiency (IWUEb) were significantly higher under CID than under AWD.The highest IWUEy and IWUEb were observed under CID-II.Our results indicate that CID can reach a lower limit of irrigation to 500 mm below the topsoil and a ponding water depth of 200 mm after rainfall, with some acceptable yield penalty when water is inadequate and costly.
Author: Shi-Kai Gao
Institution: Hohai University
Language: English
Subfield: Plant Science
Domain: Life Sciences
Open Access status: bronze
OpenAlex ID: W2790790848