Breeding high quality seedlings is the key to the production of the entire greenhouse. In this important aspect, there are many vegetable farmers who do not understand the harmful gases produced by the greenhouse fertilizer and cause the failure of nursery. The author believes that the main reason for the failure of nursery education is that some vegetable growers are eager to ferment fresh manure, chickens, and other manures. In winter, the temperature is low and fermentation is difficult. Therefore, they move fresh manure to the nursery shed for high-temperature fermentation. As everyone knows, under the conditions of high temperatures in greenhouses, feces will produce large amounts of ammonia and nitrous acid gases. When the ammonia concentration exceeds 5 parts per million, strong seedlings will poison, and all serious deaths will occur. In addition, when the cold weather arrives, there are still many vegetable farmers in the nursery shed with an open flame heating, will produce a lot of carbon monoxide and nitrous acid, if the gas concentration reaches three-10,000ths, strong seedlings will be sagging, some of the tissue cells Will die, seriously affecting the quality of vegetable seedlings. Therefore, it is recommended that growers do not stack new fertilizers in nursery sheds. They should use new soils prepared for nursery sheds to mix well, then seal them with plastic paper and ferment them. After fermentation, they can be used in nursery sheds.
Using the latest computer graphics and image technology, the patient is placed in a virtual environment, by picking technology, make the person can see on the screen or take the form of virtual figure, according to the change of scene and in the screen prompt to do all kinds of action, to keep the screen scene pattern continues, until finally complete the training goals.
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