不同肥料对烤烟根系发育及其生理活性的影响

研究了单施化肥、饼肥＋化肥、腐植酸＋化肥三种处理条件下烤烟根系发育和根系活力。结果表明；（1）饼肥和腐植酸与化肥配合施用能促进烤烟根系的生长发育，增大根系体积和干物质积累，增强根系活力，扩大根系总吸收面积和活跃吸收面积；（2）根系体积生长率和根系干重生长率呈现旺长期和园顶期两次生长高峰的趋势；（3）从根系发育的整个过程看，饼肥和腐植酸与化肥配合施用符合烤烟生长的需肥规律。

The Effect of Different Kinds of Fertilizer on Development and Conductance of Roots in Flue-cured Tobacco

The roots development and activity of flue-cured tobacco (Nicotian tabacum L) were studied under manuring chemical fertilizer, cake combinating chemical fertilizer, and humic acid combinating chemical fertilizer could promote the growth and development of tobacco roots, increase the roots volume and dry matter accumulation, enhance roots. activity, broaden roots total absorbig area and active absorbing area. The generation rate of volume and dry matter weight in roots peaked at vigorous growth stage and round top stage. During the roots development, cake and humic acid used together with chemical fertilizer conformed to the laws of wanting fertilizer of roots.