"Dana H. Myers" > wrote in message
...
> NEWSXTRA wrote:
>
>> For the past four years, average yields were around 7 1/2 tonnes per
>> hectare (sorry USAns, you will have to do the conversion!) - whereas
>> '04 yields were approaching 12 tph.
>
> I suppose that's 1000 kg per 1 hectare? Converts to 2204.6 lbs per 2.47
> acre,
> or 892.2 lbs/acre. So 12 tph would convert to 10.7 tons per acre ?
> Yikes.
> Even 6.7 tons per acre is a very healthy yield.
>
> Is my math correct?

It doesn't look right to me.

In the first case,
7.5 metric tons * 2204.6 / 2000 = 8.27 tons (US)
8.27 (tons/hectare) ÷ 2.47 (acres/hectare) = 3.35 tons/ac

So, 12 metric tons/hectare converts to 5.36 US tons/ac

That high number isn't _that_ outrageously high a crop load compared to San
Joaquin Valley yields, which can run ~3x that. Of course that would be
Thompson Seedless table grapes - not wine grapes.

Still, even the low number is pretty high compared to e.g. hillside grown
Pinot Noir, which can be less than 1/3 of that - even in a "normal" year.

Tom S