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Energy plant encyclopedia

Energy Plants Knowledgebase

Energy Wood Costs, Prices, Chopped Materials

Important points for selling chopped materials from energy woods: Weight (tons) or volumes (loosely packed cubic meters, solid cubic meters); dry substance or fresh mass; water content? Area yields – average annual yield pro hectare (lower) or total yield in specific harvesting years (higher) Parity – Where will the goods be passed? free at the […]

Energy Wood Yields

Yields make 7-15 air dry tons (absolutely dry = dry mass) per hectare annually. However, there are very significant differences depending on climate, soil valuation and water supply and varieties. For poplars, the yield can make up to 20 dry air tons in optimal conditions.

Fast-Rotation Areas Cultivation Criteria

Poplars and willows love water. Therefore, the growth of the plants depends on precipitations (at least 300−400 mm during vegetation period), the water holding capacity of the soil and the availability of ground water. Humus/nutrient content is only secondarily important. In particular, the following areas are suitable for planting: Set-aside areas, arable areas, and agricultural […]

Features of SRP (Short-Rotation Planting)

In this first stage of their life, the plants grow above-averagely fast. Within a short period, mauch mass will be produced at comparatively low density (weight per volume). We use special tree breedings (clonese), mostly of poplars, willows, and robinia (acacias). Broadleave trees are regularly “stock-settled”, i.e. cut back at the earth level. Harvest material […]

Fertilizing Energy Plants

Fertilizers are not necessarily needed; however, they could help slightly increase the yields (up to 100 kg N/ha). First of all, N-fertilizing provides a yield-increasing effect upon willows. In the year of planting, fertilizing would not be recommended, since this can cause bad maturing in autumn. Fertilizing using compost, manure or ash, if applicable, could […]

Fertilizing Miscanthus / Elephant Grass

Since, starting in mid-September, the large part of the nutrients consumed and the assimilants formed re-locates to rhizomes, only minor amounts of any fertilizers will settle out. The leaves fallen stay in the field as a mulch layer. Due to no seed/fruit formation, the need for nutrients is significantly lower than in comparable arable crops. […]

Genera, Clones and Varieties of Energy Wood

Clone means the entire range of plants having the same genetic material. Cloning is realized thrugh vegetative propagation, i.e. using shoot parts of the mother tree. In Middle Europe, we usually consider poplars and willows, the latter to be used, first of all, for water-rich soils and for cooler or highly located sites. However, willow […]

Harvest of Elephant Grass / Miscanthus

Dates and methods should be chosen before using or realizing the harvest! The normal period of harvesting is the span from November to early May, April is usually the ideal one. One week of sunshine is necessary before harvesting starts. The water content should be as low as possible (10−20 %), since a higher humidity […]

Harvesting Energy Timber

Harvesting is in the vegetation pause between December and March depending on planting distances and varieties every 2-10 years. Willows and robinia re harvested more frequently than poplars. Similarly, smaller distances or fully mechanized harvesting also provide results oftener than larger distances and extensive harvesting methods. Harvesting can be fully mechanized using re-built maize choppers […]

Legal Criteria (Austria) for Energy Woods

You should consider distances from bordering properties. The minimal distances are stipulated by provincial legislation. 3 to maximum 10 m are recommended as turning circles. The fast-rotation farm should be timely registered (within 10 years upon arrangement thereof) with a community or a district authority and harvested in accordance with §1(5) of the Forest Act […]

© - Reinhard Sperr (2008 – 2017)