早稻品种生长发育特性的差异研究

选用近年选育和已在生产上大面积推广应用的16个早稻品种（组合），比较分析了各早稻品种（组合）之间的干物质积累、茎叶生长特性、根系生长特性的差异。结果表明：不同早稻品种（组合）的地上部干物质重、地下部干物质重、叶面积、绿叶数、苗高、主茎叶挺长、主茎茎基宽、单株分蘖数、最长白根长、白根数、最长黄根长与黄根数等农艺性状均存在明显的品种间遗传差异；而且这些农艺性状早期的生长速率均明显高于后期的生长速率，大部分性状在生长发育后期出现了负向增长。

Differences of Growth and Development Characteristics amongDifferent Early Rice Varieties

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 rate of these agronomic traits in early period is higher than that in late period.What's more,negative growth happens to most agronomic traits in late period.