| Author | Post |
|---|
jml1618
Member
| Joined: | Sun Sep 2nd, 2007 |
| Location: | |
| Posts: | 5 |
| Mana: |  |
|
Posted: Sun Sep 2nd, 2007 06:02 pm |
|
The Biodiesel Association of India has called for India to dedicate 12.8 million hectares of wasteland to jatropha cultivation. The Association noted that India has 64 million hectares (158 million acres) of wasteland that could be utilized for the hardy, oil-producing tree, and called for 20% of that land to be utilized for jatropha cultivation. Jatropha yields of 635 gallons of biodiesel per acre, making it possible to produce up to 100 billion gallons of biodiesel on the proposed land.
http://biofuelsdigest.com/blog2/2007/08/31/indian-biodiesel-association-calls-for-128-million-hectares-of-jatropha/
|
trophaja_wimar
Member
| Joined: | Mon Oct 22nd, 2007 |
| Location: | |
| Posts: | 36 |
| Mana: |   |
|
Posted: Wed Oct 24th, 2007 04:21 pm |
|
Let us make some rough calculation. A gallon is roughly 3.8 litres. So, 635 gallons equal to 2413 litres, or, at 0.8 specific gravity, equal to 1,930 kgs. At 30% (seeds to oil) conversion rate, equal to 6,364kgs of seeds. Now, this figure is rather high, for a wasteland. Remember, the jatropha experts has aggreed in Netherlands that even in fertile lands the jatropha yield will be most likely 5 tonnes/ha/year.
Claiming high yield without regard to soil type is merely an exaggeration.
jml1618 wrote:
The Biodiesel Association of India has called for India to dedicate 12.8 million hectares of wasteland to jatropha cultivation. The Association noted that India has 64 million hectares (158 million acres) of wasteland that could be utilized for the hardy, oil-producing tree, and called for 20% of that land to be utilized for jatropha cultivation. Jatropha yields of 635 gallons of biodiesel per acre, making it possible to produce up to 100 billion gallons of biodiesel on the proposed land.
http://biofuelsdigest.com/blog2/2007/08/31/indian-biodiesel-association-calls-for-128-million-hectares-of-jatropha/
|
jml1618
Member
| Joined: | Sun Sep 2nd, 2007 |
| Location: | |
| Posts: | 5 |
| Mana: | |
|
Posted: Wed Oct 24th, 2007 05:15 pm |
|
My source says that the jatropha seed contains 40-60% oil (Makkar et al 1997), which would bring this yield into the 3.2-4.8 tonnes/ha range.
But, perhaps the Biodiesel Association of India is being over-optimistic in their yield.
It really comes down to, as you say, the characteristics of the wasteland, but as a general statement I would not say it is a material exaggeration unless the seeds have developed a lower oil ratio.
|
trophaja_wimar
Member
| Joined: | Mon Oct 22nd, 2007 |
| Location: | |
| Posts: | 36 |
| Mana: | |
|
Posted: Thu Oct 25th, 2007 02:23 pm |
|
That's way too high, dear friend. And very usual for jatropha seeds peddlers to overestimate the yield. At most, the dehulled jatropha seeds contains 30-35% oil. And that's for the best seeds. 60%? That is hoax, plain hoax. And mind you, you cannot get 100% of the contained oil in the seeds. At most, with mechanical presses, you can get only 90% of the oil content. If 35% oil content is assumed, then you can only get 0.9 x 35% = approximately 30%.
See?
This kind of hoax has been spread everywhere, mostly by unscrupulous seeds/seedlings peddlers. And, apologise me, mostly from India. Indonesians have also been the victims of this Indian "jatropha experts" advice.
jml1618 wrote:
My source says that the jatropha seed contains 40-60% oil (Makkar et al 1997), which would bring this yield into the 3.2-4.8 tonnes/ha range.
But, perhaps the Biodiesel Association of India is being over-optimistic in their yield.
It really comes down to, as you say, the characteristics of the wasteland, but as a general statement I would not say it is a material exaggeration unless the seeds have developed a lower oil ratio.
|
jml1618
Member
| Joined: | Sun Sep 2nd, 2007 |
| Location: | |
| Posts: | 5 |
| Mana: | |
|
Posted: Thu Oct 25th, 2007 03:21 pm |
|
The source I cited (Makkar) is peer-reviewed academic research, and for sure my source is not a "peddler of jatropha seeds".
Happy to run a correction in Biofuels Digest, but I have to have more than your say-so 
Do you have a source on your yield estimates?
For sure, the goal is good information.
|
trophaja_wimar
Member
| Joined: | Mon Oct 22nd, 2007 |
| Location: | |
| Posts: | 36 |
| Mana: | |
|
Posted: Fri Oct 26th, 2007 05:59 am |
|
Good.
Do not use my "unscientific" data. I found a better, scientific data for you to use. You can check one of them, in jml1618 wrote:
The source I cited (Makkar) is peer-reviewed academic research, and for sure my source is not a "peddler of jatropha seeds".
Happy to run a correction in Biofuels Digest, but I have to have more than your say-so
Do you have a source on your yield estimates?
For sure, the goal is good information.
|
EcoAdmin
Administrator
| Joined: | Tue Aug 9th, 2005 |
| Location: | |
| Posts: | 11 |
| Mana: | |
|
Posted: Mon Nov 5th, 2007 03:01 am |
|
| Let's say 3 tonnes per hectare is possible - would this be in wasteland? From the posts here and elsewhere probably not. So what is the reasonable range of jatropha oil yield per hectare, from very arid to the best soil and climate on earth?
|
Current time is 10:29 pm | |
|
|
|
