Plant breeding proposes to obtain crops with higher yield, better quality, resistance to diseases and shorter durations which are suitable to particular environmental conditions. It involves two types of measure: initial step includes improved agricultural preparation and and improvement of crop varieties is a permanent measure which creates genetic potentially in crop plants for higher and better yield. Scientists connected with improvement of crop varieties are called plant breeders. The science of improvement of crop varieties is termed as plant breeding. Plant breeding is an applied branch of botany and deals with the improvement of cultivated varieties (cultivars) of plants. It is the improvement in the heredity of crops and production of new crop varieties which are far better than original types in all respects.