Daily Tel £500 prize GK crossword 31.7.10

[chokkie]

I'm stuck on the last 3 from this ....

38a branch of soil science in relation fo the effective production of crops (8) ?g?ology
46d type of rocket or firework used by the RNLI for signalling ?a?o?n

Many thanks, Chox

[sandyRoe]

46d Maroon?

[factor-fiction]

agrology

[1carrieanne]

agronomy
maroon

[chokkie]

Many thanks, folks, for your prompt help. Much appreciated. Chox.

[factor-fiction]

http://en.wikipedia.org/wiki/Agrology

http://en.wikipedia.org/wiki/Agronomy

I think it's more likely to be AGROLOGY and it fits with the letters given

[chokkie]

Thanks for the amendment, much appreciated. Chox,