| Our country's economy is developping at high speed in recent years, thus agriculture has got new development directions. With improvement of people's living level, people's spiritual life also reached a new level. Therefore, city agriculture and ecology environmental protection become today's hot topics, and making them integrate with each other has become the new trend of agriculture's development. So called city agriculture is the industry to combine agriculture production, life and ecology within itself. As important cash fruit, grape can make appreciable economic benefit in both production and sightseeing areas for its beautiful shape and tasty mouthfeel. Production of edible grape is one of the most profitable projects of current garden crop production is our country, especially obvious in city agriculture and sightseeing gardening.But with expansion of grape bases'construction in our country, the reports of birds harming grape is increasing. Birds' invasion and eating not only affect grape shape but also its sale. Meanwhile, it would bring many secondary hazards, cause other diseases to decrease the output of grape sharply. Facing this serious problem, most fruit farmers take traditional anti-bird ways, e.g. Bagging grain, setting anti-bird web, minatory expulsion, chemical pest control and to develop anti-bird breed, etc to protect the grape. But the above ways are not very desirable, more or less have some defects, such as high cost, inconspicuous effect, noise pollution, decreasing the quality of grape and damage to ecological environment and etc. The worst point is that some ways destroy ecological environment and cause lots of birds to die, bringing in more and more problems of environment production and nature proction, which is the common focus of consumers in city. Thus, to find out an economical and environment-friendly unit-bird's way has become a burning question in grape production.By consulting allround documentation, we learned that many abroad large-scale farm has take ultrasonic wave bird-expulsion machine to expel birds. This newly emerging bird-driving way is different from other traditional anti-bird's harming ways for it doesn't only conquer the drawbacks of traditional ways, but also have many advantages as reliable performance, obvious effect, long operating life and little maintenance work, which didn't belong to traditional ways. The most outstanding advantage is that ultrasonic device is environment-friendly, having no affect to around people and animals. Meanwhile, it's very convenient and efficient. Aftering setting up, it can run without manual management and it's easy to operate. ultrasonic device is a new anti-bird machine designed by affecting bird's behaviour with different wave bands. In another aspect, ultrasonic anti-bird's invasion can protect both the grape and the bird, which is not only meaningful in ecological environmental protection, but expressing a new-time humanistic logos, that is, human's needs should be harmonious with nature's capacity. This must make the way be more competitive in market, making great contribution to increase grape's economic benefit.With the original intention of taking good care of wild birds and keeping ecosystem balance, this experiment is doing investigate researching by focusing on how to make use of variable-frequency ultrasonic environment-friendly and safely to expel birds eating grapes, in order to find the most suitable way by researching the actual expelling effect and compare it with other traditional ways. We expect to seek for a fast and easy bird-expelling way for fruit farmers to settle their problems met in actual production.Before the experiment, the first thing is to consult a lot of material to comprehend the transmitting element of variable-frequency ultrasonic and the safe operating way. By information collection, to learnt the grape-eating birds'breeds, behaviourd, harm periods, harm degree, etc. During the prophase of the experiment, we survey the interference of solar energy ultrasonic device to birds and different kinds of birds' behaviour change. During field experiment, we take several different bird-expelling ways, e.g. Bagging grain, setting anti-bird nets (Horizontal nets and vertical nets),using ultrasonic device,Blank group, to compare above bird-expelling ways'effects and lose amount of grape. Furthermore, setting ultrasonic at different locations in grape field to learn if surround environment has affect to ultrasonic. At last, by comparing the discrepancy of the grape eroded degree, grape quality, grape amount and damage degree to environment brought by ultrasonic device setting locations and distances to suppose the effective range, At the latter stage of this experiment, making contrastive analysis by statistics software STATISTICA 6.0.By analyzing data of field experiment, we can find that the average bird's pecking rate of Bagging grain is the lowest, which is only 0.0796%.After it is the data of ultrasonic and Horizontal nets, but the rates of vertical nets and the blank group are a little high, reaching 1.1241% and 1.3685%.By overall analyzing the average bird's pecking rate, we can conclude an initial result, that is, the effects of Bagging grain, Horizontal nets and ultrasonic are comparatively obvious, with low bird-valid rate and without obvious difference. The effect of vertical nets is undesirable, the bird's pecking rate is nearly 5 to 10 times of the former ways, equal to the blank group.The data shows, choosing reasonable and effective bird-expelling way to reduce some uncertain lost. Meanwhile, the shape of grape which is not pecked by birds is more beautiful and easier to attract the consumers' eyes, as well as more competitive. This unwittingly help to increase the farmers'income.By combining cost, effect and environmental protection these factors to analysis several different bird-expelling ways, we can find that Bagging grain is with low cost but sound response.But the operation of Bagging grain is inconvenient and likely to causing fruit ear falling, meanwhile, Bagging grain bring in waste of papery resource. By considering cost, output and economic benefit etc. Bagging grain is more suitable for small-sized farm. Setting up ultrasonic device is environment-friendly and easy to operate, without costing other human resource, but it costs too much to small-scale farm, thus it's more suitable to large-scale farm. As to setting transverse web, it's not only unfavorable to farm's manage, but also harmful to birds, so this way is not recommended.
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