Abstract: The removal of ear from the main stem or the tiller of wheat plant at earing stage induces its assimilate to go to the ear of another stalk on the same plant, so that the later is nourished supplementarily. By means of this method an investigation on the effect of food materials supply on the weight of grains was carried out. Even at favorable ripening condition, to enrich the supply of food materials to the developing ear results in a considerable increase of the weight of wheat grains. This result does not agree with the conclusion of Tumanov. The mean 1000-grain weight of the tested wheat variety “Nang-dae 2419” has increased to 59.8 g., a record about 50% heavier than its normal level (40 g). The differences of the average weight of grains between upper and middle and lower parts of the ear are not due entirely to the insufficient supply of food materials. There is little or no movement of assimilates from ear-bearing tiller to main stem or vice verse after earing stage. Under conditions of ear removal or severe defoliation of either main stem or tiller, net translocation takes place from the stalk of high to low carbohydrate production. This indicates that there exists a readjusting mechanism of translocation between stalks on the same wheat plant.