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Intensive Agro-forestry with Paulownia and Nitrogenous fixation. Part 5
By Chris Meagher
When set out in a plantation design, Paulownias are planted closely in rows, then thinned by the row, over a number of seasons. In the first year of growth, mid season, every second row is harvested as lightweight material for pole constructions and the like.
After having been cut, the stumps left in the ground will re-generate at a remarkable speed. The resultant growth is used as a cut-and-come-again source of green manure or fodder.
Early during the following growing season, the stumps fail due to over-competition from the remaining plantation, mainly this is a light requirement factor, or rather, lack thereof. The leaves are huge. Grazing animals are not allowed into the plantation at this time.
The following season, but later in, once again, the now second row of standing timber (now about 6 inches thick) is harvested.
The same process is followed, only, this harvested timber is quite valuable for cabinet making, veneers and such.
The resultant stumps are left in-situ to re-grow. At this size, once cut, the stump releases the majority of its stored nitrogen comparable with the loss of its biomass.
This mass release is then taken up by the remaining trees. The resultant re-growth, although a marvelous source of regenerating green manure or mulch - is more efficiently utilized as standing fodder for grazing animals, which in their turn add manure to the plantation.
For the next two seasons, or until the stumps cease fodder production due to over-competition, grazers are periodically allowed in to feed. Provided there is enough standing fodder, the animals will leave the bark on the timber trees alone, so damage to the trees is neglegible. After the fourth season, provided no inter-crop has been incorporated, grazers can generally be allowed into the plantation, to manage the proliferation of weed growth and add their manure to the system. These weeds tend to be soft due to the lower light conditions, therefore easily manageable by grazing stock. Although the understorey does have lower light conditions, the overall effect is more akin to 'park-like conditions', rather than 'rain-forest conditions'.
More secondary rows may indeed be subsequently removed or not, depending on the overall plantation system plan and the quality of the Paulownia timber desired. |
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The copyright for this content entitled "Intensive Agro-forestry with Paulownia and Nitrogenous fixation. Part 5" has been specified by the contributor as:
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