A close
correlation parameter (R2) of 0.92 and 0.96 in 2012 and 2013 were
observed from PCU, and the parameter (R2) of 0.90 and 0.97 in 2012
and 2013 were found from PSCU (Fig. 4), respectively. It was significant
at p = 0.01 for PCU, and for PSCU, it was significant at p = 0.05,
in both years. Similar results on rice were also reported by Yang
et al. (2012) .