土壤交换性钙对烤烟氮、磷、钾含量和吸收量的影响

Effect of Soil Available Calcium on N,P,K Contents and Uptake of Flue-cured Tobacco

土壤培育试验研究黄泥田施用不同钙肥后土壤交换性钙含量的变化情况,以钙肥为变量,通过室温培育土壤方法。结果表明:在黄泥田中各钙肥释放交换性钙的速度:硝酸钙>氢氧化钙=磷酸二氢钙>钙镁磷肥>白云石粉。盆栽试验研究土壤交换性钙对烤烟氮、磷、钾含量和吸收量的影响,试验采用单因素随机设计,试验设8个处理,4个重复。结果表明:随着钙肥施用量的增加,烟叶的含氮量、含磷量以及吸收量均呈现下降的趋势,Ca8处理烟叶含氮量及吸收量均比Ca1处理下降了24.17%和17.47%;Ca7处理烟叶含磷量及吸收量均比Ca1处理下降了38.46%和29.62%。烟叶的含钾量及吸收量均呈先增加后减少的趋势,Ca3处理的含钾量最大,Ca6处理的钾吸收量最大,分别比Ca1处理提高了13.99%和23.69%。烟根和烟茎的含氮量、含磷量和含钾量以及吸收量与烟叶的含钾量有类似的规律。整株的氮吸收量呈下降的趋势,最低的Ca8处理比Ca1处理减少了22.64%。整株的磷和钾吸收量均呈先增加后减少的趋势,均以Ca3处理的最大,分别比Ca1处理增加了6.17%和17.84%。

A soil culture experiment was conducted：taking calcium fertilizer at variable values,the changes of the available calcium in soil were studied through application of different kinds of calcium fertilizers in yellow mud field by room temperature cultivation.The results indicated that application of different kinds of calcium fertilizers in yellow mud field influenced the available calcium of soil,the speed at which fertilizers released available calcium was in the order：lime nitratecalcium hydroxide=calcium phosphate primarycalcium magnesium phosphate dolomite dust.In the pot experiment,taking calcium at variable values,eight treatments which had four repeats were designed to study the effects of soil available calcium on N,P and K content and uptake of flue-cured tobacco in a completely randomized design.The results indicated that with the increase of application of calcium fertilizers,the N content,P content and their uptakes of tobacco-leaf decreased gradually;the N content and uptake of Ca8 treatment dropped by 24.17% and 17.47% respectively in contrast with Ca1 treatment;the P content and uptake of Ca7 treatment dropped by 38.46% and 29.62% respectively in contrast with Ca1 treatment.The K content and its uptake of tobacco-leaf increased first and decreased later,the K content of tobacco-leaf with Ca3 treatment reached the peak value,the K uptake of tobacco-leaf with Ca6 treatment reached the peak value,which increased by 13.99% and 23.69% in contrast with Ca1 treatment.The N,P and K contents and their uptakes of tobacco-root and tobacco-stem had the similar regular pattern to the K content of tobacco-leaf.The whole tobacco plant N uptake decreased gradually,that of minimum Ca8 treatment dropped by 22.64% in contrast with Ca1 treatment.The whole tobacco plant P and K uptakes increased first and decreased later,those of Ca3 treatment increased by 6.17% and 17.84% in contrast with Ca1 treatment.