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STEEL SLAG AMENDMENT INCREASES NUTRIENT AVAILABILITY AND RICE YIELD IN A SUBTROPICAL PADDY FIELD IN CHINA

Published online by Cambridge University Press:  05 September 2017

WEIQI WANG ,
JORDI SARDANS ,
CHUN WANG ,
CONGSHENG ZENG ,
CHUAN TONG ,
MIREIA BARTRONS  and
JOSEP PEÑUELAS
WEIQI WANG*
Affiliation:
Institute of Geography, Fujian Normal University, Fuzhou 350007, China Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350007, China
JORDI SARDANS*
Affiliation:
CSIC, Global Ecology CREAF- CSIC-UAB, Cerdanyola del Valles, 08193 Barcelona, Catalonia, Spain CREAF, Cerdanyola del Valles, 08193 Barcelona, Catalonia, Spain
CHUN WANG
Affiliation:
Institute of Geography, Fujian Normal University, Fuzhou 350007, China Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350007, China
CONGSHENG ZENG
Affiliation:
Institute of Geography, Fujian Normal University, Fuzhou 350007, China Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350007, China
CHUAN TONG
Affiliation:
Institute of Geography, Fujian Normal University, Fuzhou 350007, China Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350007, China
MIREIA BARTRONS
Affiliation:
CSIC, Global Ecology CREAF- CSIC-UAB, Cerdanyola del Valles, 08193 Barcelona, Catalonia, Spain CREAF, Cerdanyola del Valles, 08193 Barcelona, Catalonia, Spain
JOSEP PEÑUELAS
Affiliation:
CSIC, Global Ecology CREAF- CSIC-UAB, Cerdanyola del Valles, 08193 Barcelona, Catalonia, Spain CREAF, Cerdanyola del Valles, 08193 Barcelona, Catalonia, Spain
*
††Corresponding authors. E-mails: wangweiqi15@163.com
j.sardans@creaf.uab.cat
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Summary

Rice is the main food for most of the human population, so sustainable rice production is very important for food security. The fertility of the soil in paddy fields is the key factor controlling rice growth and production. Steel slag amendment is becoming an effective method to increase the soil fertility, stabilize rice production and reduce greenhouse-gas emissions in Asiatic paddy fields (i.e. Korea, Japan, Bangladesh and China). We studied the relationships of steel slag amendment with plant–soil nutrient allocation, stoichiometry and rice yield in a paddy field in subtropical China. Amendment was associated with higher soil N and P availability, lower available-N:available-P ratio and higher available Ca and Si concentrations. Increases in P, Ca and Mg availability were correlated with high yields. High yields under steel slag amendment were also associated with high foliar and stem N and P concentrations and lower N:P ratios and with high shoot/root N and P concentration ratios, traits that are typically associated with productive ecosystems able to support species with high growth rates. The positive correlation between steel slag application and yield was partially due to an indirect effect (35% of the total effect) of enhancement of soil Ca, Si and P availability, which were positively correlated with yield. Steel slag amendment in this paddy field increased plant growth and yield by enhancing nutrient availability, altering soil and plant stoichiometry and shifting stem:root nutrient allocation.

Type
Research Article
Information
Experimental Agriculture , Volume 54 , Issue 6 , December 2018 , pp. 842 - 856
Copyright
Copyright © Cambridge University Press 2017 

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References

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