Funding for this research was provided by:
Earth Sciences Division (NNH13ZDA001N, NNX17AE66G, 18-CMS18-0052)
National Institute of Food and Agriculture (2017-67003-26485)
National Science Foundation of Sri Lanka (1639327)
Received: 16 March 2020
Accepted: 23 June 2020
First Online: 6 July 2020
: The authors declare that they have no competing interests.