垄栽烤烟养分吸收分配规律的研究

1.垄栽烤烟植株的根、茎、叶部的干物质积累和对大量元素、微量元素的积累动态均呈 S 型曲线,即在烟株生长初期约在移栽后20天烟株内干物质的积累以及对养分的吸收、积累都较慢,其直线增长期在移栽后40～80天(烟株旺盛生长期),尔后吸收、积累量又减少。烟株在移栽后80天吸收营养元素总量占总叶量的55%～70%。此期各元素的吸收量占总叶量的情况是:氮为69.94%,磷为58.42%,钾为57.55%,钙为55.12%,镁为69.70%,硼为63.33%,锰为57.60%,铜为66.83%,锌为67.96%,铁为53.83%。2.烟株所吸收的大量元素及微量元素在各器官中的分配量是不相同的,均以叶片中含量最高,约为全株养分的55%～84%,而茎部、根部中的养分含量较少,占全株养分量茎部为12%～34%,根部为5.2%～12%。

NUTRIENT ABSORPTION AND DISTRIBUTION OF RIDGE-CULTURED FLUE-CURED TOBACCO

Studies certified that:1.The accumulation of macro-and micro-elements showed a sigmoid curve,i.e.nutrients were absorbed and accumulated by tobacco on the ridge slow- ly in the phase of about 20 days and rapidly during 40-80 days after transplanting and then done slowly again.The rate of the total nutrients absorbed up to the 80th day was 55-70% of the total amount in leaves,namely N was 69.94%,P58.42%,K57.55%,Ca 55.12%,Mg 69.70% B63.33%,Mn57.60%,Cu66.83%,Zn67.96% and Fe 53.83%.In producing high quality flue-cured tobacco,it was necessary to supply macro-and micro-elements as early as possible to create good nutrition conditions to tobacco plants.N,P,K,Z,B and other fertilizers could be used for basal dressing or early top-dressing.2.The distribution of the nutrients in different parts was uneven,with ca 55-84% in leaves,12-34% in stems and roots,and only 5.2-12% in roots.