The invention discloses a planting method of cowpeas containing
iodine. The steps of the method are as follows: 1) a piece of land with mild acid and sandy
loam soil , on which no leguminous
crop is planted for two years, is selected to
plant the cowpeas, the land is firstly ploughed, raked to be fine and leveled, then ridges and ditches are made; 2) cowpea seeds are put on seedbeds for raising,
transplantation and permanent planting can be carried out when a first pair of leaves come out but not unfold, or the cowpea seeds are directly sowed on the ridges; 3) racks are inserted timely when crrus is to come out on the plants, and when the main crrus grows to a certain height, the top part of the main crrus is
cut so as to promote the growth of the blossom buds of the lateral branches at the lower part; 4) sufficient basic
fertilizer is fertilized before the
transplantation of cowpea seedlings or direct
sowing of the cowpea seeds and
solid iodine organic fertilizer is added into the
surface layer of the soil before the
transplantation of cowpea seedlings or direct
sowing of the cowpea seeds, or liquid
iodine fertilizer is sprayed to the leaf surface before picking the cowpeas. The cowpeas containing iodine planted by the invention can be a direct
natural source of iodine for
human body by eating, meanwhile, the background content of iodine in the soil and the surrounding environment can be increased, so as to gradually improve the ecologic environment that is lack of iodine.