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为了合理利用绿肥轮作改良烟田土壤、提高烤烟产质,在湖北恩施烟区采用田间试验研究了烤烟复种光叶紫花苕子作绿肥时不同翻压期对烤烟生长、产量和品质的影响。连续2年的定位试验表明,在减少化肥施用量15%、翻压绿肥15000kg/hm2情况下,于烤烟移栽前15～25天翻压绿肥效果较好,烤烟株高、最大叶面积等农艺性状,根、茎、叶及整株干物质量,烟叶产量和产值接近于或高于常规施肥措施,但是移栽前35天翻压等量光叶紫花苕子作绿肥,烤烟生长明显较差,产量和产值显著降低。减少化肥用量15%基础上不同时期翻压绿肥,有利于烤烟上部叶发育,使其单叶重量增加4.5%～18.5%,还可使中上等烟比例提高2.7～8.6个百分点。
In order to make rational use of green fertilizer for improving tobacco soil and improve the quality of flue-cured tobacco, a field experiment was conducted in Enshi tobacco-growing areas of Hubei Province to study the effects of different turn-over periods on the growth, yield and quality of flue-cured tobacco. Positioning experiments for two years in succession showed that turning green manure 15 to 25 days before transplanting of flue-cured tobacco was better when reducing chemical fertilizer application rate by 15% and turning over green manure at 15000 kg / hm2, and plant height, maximum leaf area and other agronomic characters Traits, root, stem, leaf and dry weight of whole plant, the yield and value of tobacco were close to or higher than those of conventional fertilization, but the same amount of light was used as green manure for 35 days before transplanting, Output and output have dropped significantly. Reduce the amount of fertilizer on the basis of different times turn over green manure, is conducive to the development of the upper leaves of flue-cured tobacco, the leaf weight increased by 4.5% to 18.5%, but also make the proportion of high-grade smoke increased by 2.7 to 8.6 percentage points.