早花烤烟氮、磷、钾吸收规律研究初报

此试验研究了广东南雄早花烤烟生长期间天气变化和氮磷钾三大元素的吸收和积累规律。结果表明，移栽后烤烟对短日照时数处理不敏感，不会致其生育期提前；移栽后遭遇15℃以下的低温是烟株提早开花，提前进入生育期的主要原因，且气温越低，开花越早；烟草叶内氮含量和磷含量的急剧减少可作为烟草进入成花阶段的标志；打顶后早花烤烟氮磷钾三大元素进入快速积累期，施用速效氮肥以保证驳枝上叶的正常发育是必要的。

The Way of Nitrogen, Phosphorus and Potassium Absorption of Early Flowering Flue-cured Tobacco

The absorption ways of the three major elements of NPK and the changes of the weather during the growth period of early flowering flue-cured tobacco were studied. The results showed that： the flue-cured tobacco was insensitive to short-day treatment, the short-day treatment couldn ’ t brought forward the growing season; the low temperature after transplanted below 15℃ was the main reason of early flowering, the lower the temperature was, the earlier the flowering came; the sharp declines of nitrogen content and phosphorus content in leaves was a sign of flowering stage; the three major elements of NPK came into the rapid accumulation after topping, so the application of available nitrogen in order to ensure the normal development of leaf was necessary.