烤烟根茎叶对钾肥的吸收利用率研究

摘要:在氮磷施肥水平相同的情况下，采用田间小区试验研究了不同钾肥用量对烤烟生长的影响及根茎叶对钾肥的吸收利用率。结果表明：低钾处理对烤烟叶面积系数、地上部分干物质积累量的影响较大，高钾处理的影响较小。低钾处理烟根系干物质累积总量显著大于对照，高钾处理与对照比差异不显著。地上部分对钾肥的利用率20d<40d<60d， 20d、40d钾肥的利用率与施钾量呈指数函数型高度极显著相关，60d呈二次曲线型中度相关。根系对钾肥的利用率20d<40d<60d<80d<100d，20d根系对钾肥的利用率与施钾量呈三次曲线型高度极显著相关，40d呈二次曲线型高度相关，60d、100d呈指数函数型高度极显著相关，80d呈指数函数型中度相关。

Studies on efficiency of fertilizer utilization in flue-cured tobacco with different fertilizer response

Abstract：In the same nitrogen and phosphorus fertilizer level condition, efficiency of fertilizer utilization in roots, stem and leaves with different fertilizer response and effect of different potassium fertilizer consumption on flue-cured tobacco growth was studied by field experiment. The results showed that leaf area index and dry matter accumulation in the aerial parts of the plant was effected largely by low potassium consumption but the effect by high potassium consumption was small. The dry matter accumulation total of low potassium consumption was higher significantly than control, however that of high potassium consumption was no significant different with the control. The efficiency of potassium fertilizer utilization of the aerial part was 20d<40d<60d. The efficiency of potassium fertilizer utilization of 20d and 40d was significant correlation with potassium consumption in exponent functional pattern. That of 60d was middle correlation with potassium consumption. The efficiency of potassium fertilizer utilization of roots was 20d<40d<60d<80d<100d. The efficiency of potassium fertilizer utilization of 20d roots was significant extremely correlation with potassium consumption in cubic curve pattern, that of 40d was high correlation in quadratic curve pattern, that of 60d and 100d was significant extremely correlation in exponent functional pattern and that of 80d was middle correlation in exponent functional pattern.