不同品种烤烟大田期几种营养元素积累与分配研究初报

 2000年,研究了K326,红大,G28,NC82,K358,COKER371GOLD,云烟85这7个烤烟品种大田不同时期（移栽后20,40,60,80,100,120 d）N,P,K,S,Ca,Mg等6个营养元素的积累与分配差异。结果表明,移栽后40 d是N素的吸收高峰,不同品种对N素的吸收差异不大,N在各器官中的浓度大小依次是叶＞根＞茎;不同品种对P的吸收差异较大,其中移栽后20 d时差异最小,60 d时差异最大,大多数品种移栽后50 d前P的分布是根＞叶＞茎,50 d后叶中P的浓度逐渐增大; K的吸收高峰都在移栽后40～60 d,所有品种中,红大对K的吸收最多,移栽后20 d,茎中K的浓度最高,之后叶中K的浓度逐渐增加;移栽后20 d时,品种间对S的吸收差异较大,之后差异逐渐减小,S在不同品种中的分布略有差异,但有一个共同点,移栽后80 d前根中的浓度最大,之后叶中的浓度逐渐增大;多数品种移栽后对Ca的吸收都有一个顶峰,不同时期,Ca在叶中的浓度较大;不同品种对Mg的吸收差异不大,而且随着生育期的推移,总体上呈下降趋势,移栽后60 d前,根中的浓度最大,之后叶中的浓度超过茎和根中的浓度。

Preliminary Research Report on Accumulation and Distribution of the Some Nutrient Element of Different Flue-cured Tobacco Varieties at the Field Condition

The accumulation and distribution of N,P,K,S,Ca,Mg of seven flue-cured tobacco varieties,including K326,HONGDA,G28,NC82,K358,COKER371GOLD,YUNYAN85, at different stage after transplant was studied. The results showed that absorbing peak of N reached at the 40 d after transplant, and there was little difference of absorbing nitrogen in various varieties, whose concentration was the highest in the leaf. Varietal difference of absorbing phosphorus was larger, which was the largest at the 20 d and was the least at the 60 d after transplant, and the concentration of P was the highest in the root among majority varieties before 50 d after transplant, then the concentration of P in the leaf was increased. Absorption peak of K was the 40～60 d after transplant. Among all the varieties, HONGDA had the most absorption amount to K, and the concentration of K was the highest in the stem at the 20 d after transplant, then the concentration of K in the leaf was increased. At the 20 d after transplant, different varieties had large absorption difference to S, then the difference was less. The distribution of S among different varieties has a little difference, but they had the same point that the concentration of S was the highest in the root before 80 d after transplant, then the concentration of S in leaf was increased. Most of varieties had absorption peak to Ca, and the concentration of Ca in the leaf was large at different stage after transplant. Different varieties had lesser absorption difference to Mg, and the absorption amount decreased with the time. The concentration of Mg was the highest in the root before 60 d after transplant, then the concentration of Mg in the leaf was higher than that of stem and root.