湘西晒红烟干物质和养分的积累与分配

Dry Matter and Nutrient Accumulation and Distribution in Dark Sun-cured Tobacco Growth in West Hunan Province

通过田间试验,研究了湘西晒红烟生长发育过程中干物质积累和主要养分吸收与分配。结果表明,湘西晒红烟干物质积累和主要养分吸收高峰期在移栽后30～75 d。整个生育期,干物质在各器官中的分配比例以叶中最多,茎次之,根最少;在叶中分配比例随生育进程而减少,在根和茎中分配比例随生育进程而增多。晒红烟对主要矿质营养元素的积累量表现为N>K>Ca>Mg>P;整个生育期氮磷钾在叶中的分配量最高,超过50%,在茎中的分配量次之,在根中分配量最少。

The patterns of dry matter accumulation and major nutrient uptakes and distributions were studied during the field growth of dark sun-cured tobacco. The results showed that the peak period of dry matter accumulation and major nutrient uptakes in dark sun-cured tobacco occured between 30-75 days after transplanting. The dry matter of dark sun-cured tobacco distributed most in leaves, less in stem and least in roots. With tobacco plants growing, the distribution ratio of dry matter reduced in leaves while increased in roots and stems. The order of major nutrient uptake level from high to low was N〉K〉Ca〉Mg〉E The distribution ratio of N, P, K was found most in leaves exceeding 50%, less in stems and least in roots.