Developmental Studies in Rice-1

The aim of the plant breeder is to develop a most promising form with the yield as the ultimate aim.The carrying out of comparative yield trials with different rice varieties or with different strains of a variety of rice is always an important work of diferent strains of a vrirty of rice is always an important work of the rice breeder.The methods of conducting such trials have received considerable attention and have been brought to a high state of refine considerable attention and have been brought to a high state of refinement due chiefly to the work of the Statiscians in this branch of agricultural science.Though such trials bring out yield differences between varieties or strains.the causes of such differences are still little understood and have not received adequate attention.Agriculturally,yield may be a single conceptin as so much of produce per unit area cultivated.Biologically,however,yield is a cmplex,an end result or integration of the vital ativities of the plant which depend on he genetic constitution of the plant and the environment on which it is nurtured.The internal basic physico-chemical characters constituting the vital avtivities of the plant lead up to the manifestation of external yield characters a growth.tillering.ear size.etc.