Paal and list: Thanks for this new data below. I wonder if you (and others) can make this more quantitative - in terms of trees per hectare, tonnes biomass (wet and dry or carbon) per hectare per year, and dollars per kg or tonne (and what units - wet/dry biomass or carbon).
I have seen recommendations for a planting of 10,000 trees per hectare (one per square meter). With your 360 value, might this be late in a woodlot history - or a preferred alternative starting value for the tree density? I hear of wood values often around $50/tonne (US $.05/kg) wholesale. Updating by 15 years, what would be the retail market value in Uganda of the 4-5 kg needed per family - both near the source and in the city? Or any similar quantitative data - anywhere in the world. Thanks for reminding us of the beauty of a machete. Ron On Jan 7, 2014, at 9:25 AM, Paal Wendelbo <[email protected]> wrote: > Dear Paul A > > Up to 40 mm green sprouts from energy forest activity in Africa, can easy be > cut with a machete at an angle about 45 ˚. They will split up and dry fast in > the sun, ready to be used for cooking in a TLUD within two days. 1000 trees > can be planted at one ha, and will give about 10 kg yield each every year. > The leaves should be left at the field. 360 trees around 1 ha land will give > about 3600 kg, plenty of fuel for a household and even some for sale. Into a > good TLUD this type of fuel will give about 20% biochar, which can go back to > the energy forest or soil. > > We had an experiment at Nyabyeia Forest College in Uganda 15 years ago with > a 75 hp. tractor with a wood chipper and two men with machete cutting pine > twigs. The two men could compete in price per bag, but not in quantity and > they got tired. A household need about 4-5 kg per day for cooking, and that > will easy be cut by somebody in the compound. > > Best regards Paal W > > _______________________________________________ > Stoves mailing list > > to Send a Message to the list, use the email address > [email protected] > > to UNSUBSCRIBE or Change your List Settings use the web page > http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org > > for more Biomass Cooking Stoves, News and Information see our web site: > http://stoves.bioenergylists.org/ >
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