The responses of different organ growth to NaCl stress and the threshhold salinityof sand-cultured sorghum were studied. The threshhold salinity of Du Jiao Hu and TangGao Liang cultivar is 135 and 82 mmol/L NaCl,respectively. It suggested that the for-mer is much more salt-tolerant than the latter. Under NaCl stress the responses of dif-ferent organ growth in two cultivars are similiar. The decline of growing coleoptile infresh weight is at maximum,the second is growing leaf blade and at minimum is the ex-p...