| Three main cotton varieties in pilot area were selected in an experiment to study the relations and analyze the correlation, change pattern between dry matter accumulation and water consumption of the cotton under film mulch and drip irrigation at different growth stages.The results showed that the change trends accorded with the “S” shape, and the maximum of dry matter accumulation and water consumption were 1.52～2.95 g and 6.84～7.14 mm, which appeared both in the stage of cotton flowering and boll.The fitting results of growth rate between dry matter accumulation and water consumption showed that its R2 values were greater than 0.95 and F test value reached significant levels, and the dry matter accumulation and the consumption of water had significant correlation. |