With the increasing level of computer science and machinery technology, precise control of agricultural machinery plays a more and more important role in agricultural information technology, therefore the research on precise control of agricultural machinery has attracted a lot of attention. This paper presents an effective method of spraying control of agricultural machinery based on machine vision. In this method, firstly, we make a distinction between crop rows and background in farmland image, secondly, the recognition result were used to control the electronic nozzles' state, so that the precise control of the spraying was achieved. Experiment show that the algorithm...