The grid shading

The grid shading a tenevka of 6х5 m (80% ) green

Grid shading (tenyovka) Degree of shading of 45% , 60% , 80% . Stabilization to influence of ultraviolet rays: 3 years. As the power source for photosynthesis a sunlight is the most important condition of growth and development of plants. Moreover, at insufficient illumination the photosynthesis speed and consequently activity of growth is in very close dependence on intensity of light: the more light, the harvest is higher. However excess light not only is not useful to plants, but is even harmful. On the one hand, on achievement of a certain level of illumination there is a photosynthesis saturation: further increase of intensity of light does not intensify accumulation of chemical energy any more. Level of a svetonasyshcheniye is lower for shade - loving plants and is higher for photophilous, but also for those, and for others in a sunny day this level is exceeded repeatedly. On the other hand, on photosynthesis only very insignificant part of energy of a sunlight is used. Other part goes for heating of soil and a surface of plants, and from them - air. With temperature increase power consumption increases by a transpiration and breath of plants. At extremely high temperatures plants spend more energy, than is formed as a result of photosynthesis. As a result growth of plants is slowed down that leads to a harvest shortage. Quality of a harvest for many plants, especially decorative, also significantly worsens. The situation is aggravated if roots of a plant do not find enough moisture for a normal transpiration. Water deficiency gives start to a number of negative fiziologo - biochemical changes in a plant, the plant exhausts, turns it into an easy target for diseases and wreckers. Proceeding from, the most important factor of increase of the quantity and quality of a harvest above told is reduction of intensity of the sunlight coming to plants to the spring and summer period. For plants of an open ground the optimal solution - use of the shading grids. On the one hand, the shading grids detain excess solar radiation, on the other hand, refract and more evenly distribute the passed sunlight. Degree of shading of a grid is defined by material of which it is made the sizes of a thread and drawing of a grid, that is character of an interlacing of threads. The grid by means of metal, plastic or wooden frameworks, industrial production or self - made is fixed. Equally well the specified grids shade plants of the closed soil. At the same time it should be noted that for greenhouses, both glass, and film, the range of possible means for reduction of intensity of a sunlight is significantly wider. Higher level of regulation of a microclimate in the greenhouse imposes increased requirements and to shading. Generally, it has to be differentiated, i. e. to provide a high svetopropuskaniye in cloudy weather and to detain excess radiation in solar. The ideal tool for this purpose - system of a zashtorivaniye. The shading screen is closed at high illumination and opens at low. As the shading material the grid or special fabric is used.