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This study discussed the discipline structure of crop grey breeding science and its features and summarized the theories and technical systems for crop grey breeding science which are consisted of five systems, eight theories, nine principles, a technical route and a computer decision-making system. Under the guidance of the theories and methods, breeding workers have bred 27 new varieties, such as 4 wheat varieties, 3 mung bean varieties, 6 cotton varieties, 4 millet varieties, 1 soybean variety, 1 cowpea variety, 1 pumpkin variety, 1 sweet corn variety, 2 mulberry varieties, 1 silkworm variety, 3 reygrass varieties and so on. The popularization and application of these varieties in production has huge economic and social benefits, thus provides a strong support for the feasibility of theories and technical systems of crop grey breeding science from the perspective of breeding practice.

Theories and Technical Systems for Crop Grey Breeding Science and Their Applications