[R-meta] Meta-analysis with missing data

[Mekides Gardi]

Dear All,

Seeking help on meta-analysis. I am conducting a meta-analysis on the  
response of two cereal crops to elevated CO2. Most of the studies  
didn't report SD or SE. I have the mean values for both the control  
and experimental group and sample size as well.
I read on literature there is still a way to do meta-analysis without  
SD or SE. Could you provide me with guides on how to do it in R with  
metafor package?

Thanks in advance.

Mekides