硼对烤烟干物质积累和养分吸收的动态模拟

Simulating the dynamics of dry matter and nutrient accumulation of flue-cured tobacco under different boron concentration

采用溶液培养方法，研究了不同硼浓度下烤烟干物质积累动态和养分吸收动态变化特点。结果表明，不同硼浓度下烤烟干物质积累动态和养分吸收动态可用Logistic方程描述。烤烟地上部分和根部干物质积累最大速率和养分吸收最大速率出现日期不同。BO3^3-浓度为0～200mg／L的各处理烤烟植株地上部氮、磷、钾养分吸收最大速率出现在干物质积累最大速率之前；而根部则出现在干物质积累最大速率之后。BO3^3-浓度为0．25～2．00mg／L的各处理烤烟干物质积累和养分吸收最大速率明显高于其他3个处理，并且最大积累速率出现时间均相对较晚。

A solution cuhure experiment was conducted to study the dynamics of dry matter accumulation and N, P, K absorption by flue-cured tobacco under different boron concentration. The results indicated that the dynamics of dry matter accumulation and N, P, K uptake of flue-cured tobacco could be described by logistic curve equation. The time for fastest dry matter accumulation and nutrient uptake was different for shoots and roots of flue-cured tobacco. The time for maximum increase rations （MIR） of dry matter on shoots was later than that of the highest absorption rations （HAR） of N, P, K when BO3^3- concentration was 0-200 mg/L. The time of MIR of dry matter on roots was earlier than that of HAR of N, P, K, in each treatment. The MIR of dry matter and the HAR of N, P, K was pronounced higher than other treatments when BO3^3- concentration was 0.25-2.00 mg/L and the time of MIR of dry matter and the time of HAR of N, P and K was comparatively later.