目前,一些发达国家已将电脑、全球定位系统和遥感遥测等高新技术应用于农业生产,建立起一种新的农业模式——精准农业。精准农业的主要特点是精确施肥、精确估产、精确作业。例如在美国明尼苏达州,一位农民在田里工作,他的拖拉机上安装了一台电脑,从电脑屏幕上可以看到面积达700hm~2 的玉米和大豆田的地图,电脑还会指示哪个地区需要施用多少肥料。如果再装一台接收器, At present, some developed countries have applied high-tech technologies such as computers, global positioning systems and remote sensing telemetry to agricultural production and set up a new agricultural mode - precision agriculture. Precision agriculture is the main characteristic of accurate fertilization, accurate assessment of production, accurate operation. For example, in Minnesota, USA, a farmer works in the fields. A computer is installed on his tractor and maps of corn and soybean fields of 700hm ~ 2 can be seen on the computer screen. The computer also indicates which area needs How much fertilizer to apply. If you install a receiver,