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旨在探究钾用量与灌溉方式互作对土壤-烤烟系统钾素变化及烟叶质量的影响问题。采用大田裂区设计,研究了不同灌溉方式与钾用量互作对土壤-烤烟系统钾素及烟叶内在化学成分的影响。同一灌溉方式下,增施钾肥显著提高土壤钾素含量,土壤速效钾和缓效钾含量随钾肥用量的增加而增加;与不施钾相比,施钾显著提高烟叶钾含量,但常规施钾与高量施钾处理间烟叶钾含量差异不显著。相同施钾量下,3种灌溉方式相比,以交替对1/2区域灌水处理土壤速效钾和缓效钾含量最低,烟叶钾含量以固定对1/2区域灌水处理最高,但与交替对1/2区域灌溉处理差异不显著。烟叶采收结束时,9个处理的土壤速效钾含量均随土层深度的增加,呈先降低再增加的趋势,至60~100 cm土层趋于稳定。灌水方式和钾用量互作对烟叶化学成分有一定影响,以常规施钾与固定1/2区域灌水处理组合的烟叶化学成分协调性最佳。在常规施钾量下,固定1/2区域灌水处理不仅改变了钾素在不同土层的分布,而且提高了烟叶钾含量,且减少了灌溉用水,建议可在黄淮烟区进行示范应用。
The purpose is to explore the effect of potassium interaction and irrigation mode on the change of potassium in tobacco soil and tobacco quality. The field design was used to study the effects of different irrigation methods and potassium dosage on the chemical composition of potassium and tobacco leaf in soil-flue-cured tobacco. Under the same irrigation pattern, the increase of K fertilizer significantly increased the content of K in soil, and the content of available K and K in soil increased with the increase of K application rate. Compared with no K application, K application significantly increased K content in leaves, There was no significant difference in the potassium content of tobacco leaves between high potassium application. Under the same application of potassium, compared with the three irrigation modes, the contents of available potassium and slow-acting potassium were the lowest in the alternate irrigation of 1/2 area, and the potassium content of tobacco leaves was the highest in the 1/2 irrigation area, There was no significant difference in regional irrigation treatment. At the end of tobacco harvesting, the contents of available potassium in the nine treatments decreased and then increased with the increase of soil depth, and stabilized at the depth of 60-100 cm. The interaction between irrigation methods and potassium dosage had certain influence on the chemical composition of tobacco leaf. The chemical composition of the tobacco leaf with the combination of conventional potassium fertilizer and fixed 1/2 irrigation was the best. Under the conventional application of potassium, fixing 1/2 zone irrigation not only changed the distribution of potassium in different soil layers, but also increased the potassium content of tobacco leaf and reduced irrigation water, which is suggested for demonstration application in Huang-Huai tobacco area.