TY - JOUR
T1 - Alternate wetting and drying irrigation and phosphorus rates affect grain yield and quality and heavy metal accumulation in rice
AU - Song, Tao
AU - Das, Debatosh
AU - Hu, Qijuan
AU - Yang, Feng
AU - Zhang, Jianhua
N1 - Funding Information:
This work was supported by the China Postdoctoral Science Foundation (2019M663122, 2020M672838, 2020M672839), the National Key Research and Development Program of China (2017YFE0118100 and 2018YFD02003025), the National Natural Science Foundation of China (31761130073 and 31872169), the Shenzhen Virtual University Park Support Scheme to Shenzhen Research Institute of the Chinese University of Hong Kong and the Hong Kong Research Grant Council (AoE/M-05/12, AoE/M-403/16, CUHK14122415, 14160516, and 14177617).
Funding Information:
This work was supported by the China Postdoctoral Science Foundation ( 2019M663122 , 2020M672838 , 2020M672839 ), the National Key Research and Development Program of China ( 2017YFE0118100 and 2018YFD02003025 ), the National Natural Science Foundation of China ( 31761130073 and 31872169 ), the Shenzhen Virtual University Park Support Scheme to Shenzhen Research Institute of the Chinese University of Hong Kong and the Hong Kong Research Grant Council ( AoE/M-05/12 , AoE/M-403/16 , CUHK14122415 , 14160516 , and 14177617 ).
Copyright © 2020 Elsevier B.V. All rights reserved.
PY - 2021/1/15
Y1 - 2021/1/15
N2 - Alternate wetting and drying (AWD) irrigation was reported to increase rice root activity and element bioavailability, which results in enhanced heavy metal (HM) absorption and this HM ends up in rice grains. HM uptake was also affected by the levels of phosphorus (P) fertilizer application. HMs enter food chain via consumption of rice grains and cause health problems. In this study, we compared the differences in grain yield, grain quality, water use efficiency (WUE), partial factor productivity of applied P (PFPp), HM contents in different tissues and transfer coefficient (TC) of HMs under a combination of treatments involving two irrigation regimes (continuous flooding (CF) and AWD irrigation) and three P fertilizer application levels (0.4 g P2O5/kg soil, HP; 0.2 g P2O5/kg soil, MP; 0 g P2O5/kg soil, LP). Compared to CF, AWD irrigation increased grain yield (without reducing grain quality), decreased irrigation water use and the number of irrigation events needed and improved WUE and PFPp at all three P fertilizer application levels, while the accumulation of HMs in grains increased when more P was applied. This accumulation of HMs in grains thus requires immediate attention to the level of P fertilizer application and its optimization in water-saving AWD irrigation to minimize grain HM content.
AB - Alternate wetting and drying (AWD) irrigation was reported to increase rice root activity and element bioavailability, which results in enhanced heavy metal (HM) absorption and this HM ends up in rice grains. HM uptake was also affected by the levels of phosphorus (P) fertilizer application. HMs enter food chain via consumption of rice grains and cause health problems. In this study, we compared the differences in grain yield, grain quality, water use efficiency (WUE), partial factor productivity of applied P (PFPp), HM contents in different tissues and transfer coefficient (TC) of HMs under a combination of treatments involving two irrigation regimes (continuous flooding (CF) and AWD irrigation) and three P fertilizer application levels (0.4 g P2O5/kg soil, HP; 0.2 g P2O5/kg soil, MP; 0 g P2O5/kg soil, LP). Compared to CF, AWD irrigation increased grain yield (without reducing grain quality), decreased irrigation water use and the number of irrigation events needed and improved WUE and PFPp at all three P fertilizer application levels, while the accumulation of HMs in grains increased when more P was applied. This accumulation of HMs in grains thus requires immediate attention to the level of P fertilizer application and its optimization in water-saving AWD irrigation to minimize grain HM content.
KW - Grain quality
KW - Heavy metal
KW - Rice
KW - Transfer coefficient
KW - Water-saving irrigation
KW - Yield
UR - http://www.scopus.com/inward/record.url?scp=85090052648&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2020.141862
DO - 10.1016/j.scitotenv.2020.141862
M3 - Journal article
C2 - 32889281
AN - SCOPUS:85090052648
SN - 0048-9697
VL - 752
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 141862
ER -