烟田土壤养分移动规律研究——Ⅰ.氮、磷、钾的移动规律

Investigation into the movement of mineral fertilizer in tobacco fieldI. Nitrogen, phosphorus and potassium

研究了烟田地膜覆盖栽培和裸栽条件下土壤中碱解氮、有效磷、交换性钾和有机质含量变化规律。结果表明 ,土壤中碱解氮和交换性钾的移动性较大 ,有效磷的移动性较小 ;覆膜栽培土壤中碱解氮和交换性钾明显朝上层土壤移动富集 ,裸栽条件下则朝下层土壤移动 ,裸栽分次施肥与一次施肥土壤中碱解氮、交换性钾含量的变化趋势相似。

The movement directions of mineral fertilizer, nitrogen, phosphorus, potassium in tobacco field covered and uncovered by plastic film was investigated. The result show that the moving of nitrogen, potassium and magnesium is remarkable, while phosphorus isn't. The moving of mineral fertilizer toward top soil when tobacco field is covered by plastic film, and toward under soil rapidly when the field is uncovered. The highest contents of nitrogen and potassium in top soil (0～2cm) are 285.65mg/kg and 1120.00mg/kg respectively during the period of determination, when the field is covered by plastic film. The contents of nitrogen, potassium under soil (24～26cm) increased in the early 20 days after transplantation, and decreased rapidly when tobacco field is uncovered by plastic film.