Abstract: In this article authors have compared carbohydrate contents in secon-dary sink (stem+ leaf sheath) of rice grown at three different altitude localities under the same variety is used and conditions of the same soil, basal and top dressing. The fesults showed that all the contents of total sugar or starch in secondary sink increase as the raising altitude during the +full heading time and the yellow ripe stage. As compared with the full heading titue, their contents increase at the high-altitude,localities, but deerease at the low-altitude localities, during the yellow ripe stage. At the full heading time the starch contents in secondary sink decrease as the increasing dose of basal dressing with nitrogenous fertilizer. At the yellow ripe stage the starch contents in secondary sink of each treatment increase as the increa-sing dose of basal dressing with nitrogenous fertilizer in the warm-cool rice belt. The starch contents in secondary sink of rice tend towards conformity at the low-heat localities, as comparcd with each treatment at different localitieS, however, all the increases of starch contents in secondary sink are due to raised altitude.

Key words: Rice