dennis@home wrote:


"Tim Lamb" wrote in message
...


Now for the arithmetic.... Most arable crops need to be grown as part
of a rotation to reduce the build up of pests and diseases. Let us say
you grow it one year in four. That is 1.8tons x 0.4 /4 = 0.18 tons of
oil/ha.

A bit too simple.. you can grow other oil plants in the rotation, like
rape.

No dennis, you cant. Not to go up on yield significantly anyway.

Like solar panels plants need light.

And like solar panels that means they do best in summer.

At our latitudes the best you will ever manage is about 3 crops in two
years which is not enough to make any significant difference

And to do even that needs a lot of rain and added fertiliser. Which uses
oil to make and diesel to spread.


But carry on with your fancy qualitative ideas. It must be blissful to
be so ignorant of mathematics that you still believe in homeopathy.






--
To people who know nothing, anything is possible.
To people who know too much, it is a sad fact
that they know how little is really possible -
and how hard it is to achieve it.