The collection reflects the achievements of the introduction of the method of chemical mutagenesis into practice. The tasks of agricultural production, including a comprehensive increase in the production of cereals, technical, vegetable and fruit crops, are solved thanks to the new intensive varieties created with the help of chemical mutagens. The collection introduces the reader to the features of these varieties and their breeding .. Another direction reflected in the book is the development of a method for increasing plant yield by the influence of a phenotypic growth activator - p-aminobenzoic acid . The accumulated experience in the development of the method of chemical mutagenesis allows specialists to assess the possible harm to the hereditary apparatus of living organisms due to the growing chemical contamination of the biosphere. A number of articles are devoted to this important sub-section of chemical mutagenesis the genetic screening of environmental mutagen. The collection is designed for geneticists, breeders, general biologists.