双行凹型垄及地膜覆盖对烟叶和土壤中磷含量的影响

Effects of Double-row Concave Ridge and Film Mulching on Phosphorus Content in Tobacco Leaves and Soils

采用田间试验与室内分析相结合的方法,探讨了烤烟地膜覆盖与双行凹型垄结合对烤烟及土壤磷素含量的影响。结果表明,对烤烟烟株磷的积累量的影响表现为双行凹型垄全生育期盖膜并遇旱灌溉(1.95 g/株)>双行凹型垄地膜全生育期盖膜(1.81 g/株)>单行垄盖膜团棵揭膜(1.69 g/株)>双行凹型垄盖膜团棵揭膜(1.56 g/株);距烟株5 cm、15 cm和25 cm的3个取样点均以旺长初期土壤速效磷含量最高;在旺长初期,两个团棵揭膜处理均表现出距烟株较近的位点速效磷含量较低,而采烤后表现相反;双行垄全生育期盖膜能促进速效磷向表层富集,灌溉能缓解这种富集现象。

The effects of double-row concave ridge and film mulching on phosphorus content in flue-cured tobacco leaves and soils were studied by field and laboratory experiments. The results indicated that phosphorus accumulation in flue-cured tobacco leaves was the greatest in the treatment of double-row concave ridge and film mulching in whole growth period with irrigation under drought condition, reaching 1.95 g per plant, followed subsequently by the treatments of double-row concave ridge and film mulching in whole growth period （1.81 g per plant）, single-row concave ridge and film mulching with uncovering in rosette stage（1.69 g per plant）, double-row concave ridge and film mulching with uncovering in rosette stage（1.56 g per plant）. The available phosphorus content of soil from three sampling points （5, 15 and 25 cm to tobacco plants） was the highest in early vigorus period. The two treatments of film uncovering in rosette stage demonstrated lower phophorus content in points near tobacco plants in early vigorous stage, but it was opposite during harvest stage. In addition, the treatment of double-row concave ridge and film mulching in whole growth period could promote the concentration of available phosphorus in surface soil, which was reduced after irrigation.