Abstract:

Field experiments were carried out to research the effect of Humic acid on soil physical and chemical properties in tobacco fields at Jiaxian County, Henan Province in 2006-2007. The results showed that after humic acid was used, soil ability to maintain moisture increased, especially in fast growing period; soil bulk density decreased and soil degree of porosity increased. Application of humic acid can improve available nitrogen, available phosphorus, available potassium and organic matter content of the seasonal soil, but there was no significant difference in available nitrogen and organic matter content between the treatments and the control. Compared with fertilizer treatment, application humic acid could increase soil nitrogen validity in the whole growth period; soil available phosphorus content was higher than the control, especially in rosette stage it was 5~20 mg/kg more than the control. The content of soil available potassium kept a high content level at latter stage of tobacco growth. The effect of treatment T2 (750 kg/hm2) was the best.

Key words: flue-cured tobacco, humic acid, soil physical and chemical properties

摘要：

2006-2007年在河南郏县进行田间试验,研究腐殖酸对植烟土壤物理和化学性状的影响。结果表明,施用腐殖酸可增强土壤的保水能力,尤其是增加旺长期以后的土壤含水量;降低土壤容重、提高土壤孔隙度。施用腐殖酸能提高当季土壤中碱解氮、速效磷、速效钾和有机质含量,但各处理碱解氮、有机质含量与对照并未达到显著水平。与单施化肥的处理相比,施用腐殖酸的处理能提高整个烟株生育期中土壤氮素的有效性;土壤中的速效磷含量高于对照,特别是团棵期土壤中的速效磷含量要比对照高5~20 mg/kg。施用腐殖酸后在烟株生长后期土壤仍然保持了较高的速效钾含量。以处理T2(750 kg/hm2)效果最好。

关键词: 烤烟;腐殖酸;土壤理化性状