Soil erosion is one of the important concerns for any type of vegetation. This mainly occurs in two forms, the first one is erosion that is caused by wind and the other is the erosion that is being caused by rain. In both of the above cases the top soil is being washed away which causes lack of fertility for the plant and thus leading to loss of nutrients for the plant.
Wind erosion
The soil erosion that is being caused by wind mainly occurs in two ways. The first way is the removal of soil and deposition of top soil particles in other areas and the other way is due to the collision of particles that occurs due to wind. In the latter case there will be loss of particles due to the abrasive effect of collision. There should be special precaution that should 
be taken in areas of less vegetation to prevent erosion due to wind.
Rain erosion
Rainfall is the prime driver of soil erosion and the top soil may either be splashed off or they can flow off with the water. Whenever the force of the water falling on the soil is greater than the resistance that is being offered by the soil the soil gets eroded away in a great manner. This washing away of top soil is very sever on the plans since there will be reduced water holding capacity for the soil. There are also other problems that will be raised due to erosion of top soil since there will be problem of blockage of dams, the quality of the drinking water will also be reduced due to contamination with soil
Minimizing erosion
By increasing the density of vegetation it is possible to interlock the soil due to the hold which is being applied by the plants on the soil. The slopes have natural tendency to release top soil due to gravity effect and force of water. Thus by incorporating terrace farms it is possible to reduce the force of water and prevent the gravity factor. In terrace farming the fields will be built at right angles to the slope which will be of best use in effectively reducing the erosion of top soil. This method can be predominantly seen in areas where there is tea and coffee plantation.
Thus it is very important to prevent erosion of top soil to increase the nutrient supply to the plants and also to get good quality output.
The scientific study has said that the universe expands day by day. Literally it may mean the abiotic component but the actual fact is that it is shrinking. Actually speaking the population of man in this universe is increasing greatly. Man being the one to create problem in every aspect of the ecosystem always tries to find an alternative to compensate the loss. Greenhouse is one such beautiful finding made by man to grow plants effectively. Greenhouse, by the name it suggests that it is a house for growing the green. Many would be familiar of the phrase, “Grow green or else we ruin”. Greenhouse has given each and every human being a wonderful platform to cultivate plants.
Basic forms:
An example of greenhouse cold frame application
A greenhouse has two basic forms. One is attached greenhouse and other is a standalone greenhouse. In attached greenhouse the power supply is supplied from the house itself where as in case of a standalone greenhouse the power supply and all the other accessories has to be supplied separately. These types of standalone greenhouses can be made where there is sufficient space to have an individual green house. Greenhouse can be built using either plastics or by means of glass. The photo chromatic technique that can be employed in glass makes it preferable over plastics. The basic concept behind the photochromatization is nothing but SMA. SMA is the abbreviation of shape memory alloys. Shape memory alloys are also known as super alloys. These substances have the natural tendency to adjust to the situations that prevail and act accordingly.
Basic models:
schmatics
The two basic models of greenhouse are cold frames and rack. Cold frames are set out in situations were there is less amount of space where as in case of racks ample space for setting of greenhouse is a must. The greenhouse cold frames constitute to the simplest and cheapest forms of greenhouse. By the name it suggests that it is suitable for growing of plants that requires cold climate. Cold frames are normally used for early sprouting of the seeds, growth of herbs and so on. It is so important for certain plants that the temperature within in the house doesn’t go beyond a particular temperature. So for cultivating those kinds of plants cold frames are very important. The glass panels adjust so as to allow only a small amount of sunlight to enter the greenhouse thereby preventing the damage of plants. Hence greenhouse cold frames are more preferred ones amongst the farmers.
