The differences of dry matter accumulation,growth characteristics of stems and leaves,roots growth characteristics in 16 types of early rice varieties and combinations were compared and analysed.The results show that there are distinct differences of agronmic characteristics,such as dry matter weight at lower organs and upper organs,leaf area,plant height,leaf blade length of main stem,lower stem width of main stem,plant tiller numbers,the longest white root length,white root numbers,the longest yellow root length,yellow numbers,among different early rice varieties and combinations.The growth ...