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Title of Journal: J Plant Res

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Abbravation: Journal of Plant Research

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Springer Japan

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DOI

10.1007/s11071-014-1504-0

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1618-0860

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Extensive investigation of the sap flow of maize p

Authors: Liwen Zhao Zhibin He Wenzhi Zhao Qiyue Yang
Publish Date: 2016/06/04
Volume: 129, Issue: 5, Pages: 841-851
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Abstract

A better understanding of the sap flow characteristics of maize plants is critical for improving irrigation wateruse efficiency especially for regions facing water resource shortages In this study sap flow rates related soilphysics and plantgrowth parameters and meteorological factors were simultaneously monitored in a maize field in two consecutive years 2011 and 2012 and the sap flow rates of the maize plants were extensively analyzed based on the monitored data Seasonal and daily variational characteristics were identified at different growth stages and under different weather conditions respectively The analyses on the relationships between sap flow rate and reference evapotranspiration ET0 as well as several plantgrowth parameters indicate that the irrigation schedule can exert an influence on sap flow and can consequently affect crop yield The ranking of the main meteorological factors affecting the sap flow rate was net radiation  air temperature  vapor pressure deficit  wind speed For a quick estimation of sap flow rates an empirical formula based on the two top influencing factors was put forward and verified to be reliable The sap flow rate appeared to show little response to irrigation when the water content was relatively high implying that some of the irrigation in recent years may have been wasted These results may help to reveal the biophysical processes of maize plants related to plant transpiration which could be beneficial for establishing an efficient irrigation management system in this region and also for providing a reference for other maizeplanting regionsThis work was supported by the National Science Fund for Distinguished Yong Scholars Grant No 41125002 and the National Natural Science Foundation of China Grant Nos 41271036 and 41501044 The authors greatly appreciate the help from Dr Ji XB and Dr Jin BW in carrying out the experiments Many thanks also go to the two anonymous reviewers for their constructive comments and suggestions

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