Vimek AB: Vimek concept

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Scarification plays a key role in improving the chances of survival and the conditions for growth of a seed or plant. The problems encountered when establishing a new forest are the same no matter where in the world it is planted. Just as in agriculture, the greatest risk of harm comes from vermin and competing vegetation in fertile soil. This is the main advantage of scarification: protecting the seed or plant during its start in life, when it is most exposed to attack by vermin and competing vegetation. In the northern regions of the globe, however, improved growth is the more important aspect as attacks by vermin are not as severe. Naturally, the positive effects of scarification are complex, and it is difficult to rank and compare them. The cumulative advantages of increased survival rates and improved growth are, however, unequivocal. As such, scarification gives the seed or plant a helping hand.

At northern latitudes, the growing season is short, with trees generally growing from May to September. The temperature is seldom high. Proper scarification provides higher air and ground temperatures, lets in more sunlight, provides more nutrients, and improves the water balance of the soil. All these advantages provide increased growth during the plant’s first year, corresponding to that of plants several degrees further south. Due to the temperature difference, the growth aspect increases in importance as one moves north.

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The optimum scarification for planting is known as inverted humus. This provides the components that give plants the greatest chance of survival and the best growth potential.

Increased air and ground temperatures are attained because proper scarification creates a raised planting spot. Cold air is heavier than warm air and consequently the difference in temperature between ground level and a couple of decimeters above ground often measures a couple of degrees during the coldest part of the day. The fact that sunlight can more easily reach a raised and cleared surface also provides a higher temperature. The lack of vegetation allows heat loss during the night, providing a lower temperature in scarified areas on clear nights. The extra sunlight provides not only increased temperature, but even more energy for photosynthesis. Scarification increases nutrients because the humus layer is compressed and imbedded in the mineral soil. The nutrients in the humus and mineral soil must compost if they are to be made available to the plants, and an important factor in rapid composting is warmth. This determines the rate of decay and thereby nutrient availability.

The oxygen and water balances of the soil are also important aspects to consider when reducing the risk of the plant dying young and to optimize growth. A soil with well-balanced moisture content never feels wet or damp to the touch. Practical experience and extensive trials show that a considerably larger number of plants that die do so by drowning rather than drought. An optimum balance between water and oxygen in the soil means reducing the water content for the greater part of the growing season. This is done by scarification, which creates a higher planting spot than if the plant is planted at ground level. In this way, the soil is drained of water thereby eliminating the risk of the plant drowning. Draining the soil by scarification also creates a flow of rainwater that ensures the soil is oxygenated, which allows the plant’s root system to develop well. The right combination of oxygen and water also helps increase the rate of composting. Composting is slow, for example, in marshlands where the water content is high and on dry soil where the water content is low.

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