随着人口的增长及科学技术的发展,农业集约化逐步代替粗放的经营制度,粮食增长速度也相应提高。因此,提高单产不仅是现在,而且也是21世纪农业的基本途径;为了不断提高单产,21世纪的农业将是高技术、技术密集型、节能、省力、高产、优质的农业。目前,世界耕地约有73科,2000种杂草给农业 With population growth and the development of science and technology, intensification of agriculture gradually replaced the extensive management system and the rate of grain growth increased correspondingly. Therefore, raising yields is not only the present, but also the basic approach to agriculture in the 21st century. In order to continuously raise yields, agriculture in the 21st century will be a high-tech, technology-intensive, energy-saving, labor-saving, high-yielding and high-quality agriculture. At present, there are about 73 families and about 2,000 weeds in agriculture in the world