Al-Mulla, Ahmed Abdulla2022-05-182022-05-1819891773https://drepo.sdl.edu.sa/handle/20.500.14154/4001The research involved the preparation of the present thesis on field trials were conducted for two seasons 85-1986 and 86-1987 in two locations: the training and research station at King Faisal, and sub-station belonging to the project HIDA.enThesis