应用^45Ca示踪技术研究烤烟对钙肥的吸收及分布规律

应用放射性核素^45Ca示踪方法,以烤烟品种“K326”为材料进行盆栽试验,研究在不同施钙水平下,烤烟对钙素营养的吸收分配规律。结果表明：烟株在旺长期体内积存Ca量最高。烤烟吸收的Ca肥量随施Ca水平的提高或生育期的进程而增加,有显著的正相关性。将烟吸收的钙肥在烟株的地上部分主要分配在叶中,其次是茎,花与侧芽较少。烟叶中吸收Ca肥量占地上部分的百分数随生育期进程下降,而烟茎的却增加。烟株地上部吸收的Ca肥量占施入量的百分数随施Ca水平的提高而减少,但随生育期进程而增加。

Study of calcium assimilation and distribution characteristics in flue-cured tobacco upon different applying amount of fertilizer by ~(45)Ca

A trial of calcium assimilation and distribution characteristic s in flue-cured tobacco plant was carried out with the aid of 45Ca tracer technique.The basin trial was done with tobacco "k326".Results obtained as following:The accumulation of 45Ca content was the muliest at vigrous growth stage.The more the level of different application of Ca amount or process of growth period,the more the Ca fertilizer amount of tobacco assimilation.It was significantly positive correlation.The Ca fertilizer of tobacco assimilation distributed great amount in leaf,secondarily in flower and lateral bud.The percentage of leaf assimilating Ca fertilizer at the total part up ground reduced as growth period progressed,but the precentage of stem increased.The more the level of application Ca,the less the percentage of tobacco assimilated Ca fertilizer at total appling Ca amount,but it increased as growth period progressed.