Hi Jo

Hope all is well and that life is treating you okay.

I ment to write this a while back... but it kept on slipping me mind.

Did you have any joy with your request for NH4NO3 with differing
15N composition.... I can happily enrich but I would quite like
something that is more negative...

this is specifically for the NH4 rather than the NO3....

Have you finished yet and if so have you found anything else?

Take care

Best wishes

Andrew




Dr A.M.Johnston
SPDU
Scottish Crop Research Institute
Invergowrie
Dundee
DD2 5DA
Scotland

Tel No: (44) 1382 562731 ext 3732
Fax No: (44) 1382 562426