钾对高硼土壤烤烟生长及离子吸收的影响

为探讨钾肥对高硼毒害的缓解效应,以烤烟品种K326为材料,通过大田试验研究了不同施钾量对高硼植烟土壤烤烟干物质量、经济效益及烟株内硼、氮、磷和钾含量的影响。结果表明:高硼土壤会显著增加烟株各部位硼含量,显著降低烟株内氮、磷、钾含量,干物质量以及经济效益;在高硼土壤下,施钾肥能够显著提高烟株干物质量和经济效益,抑制烟株对硼的吸收,促进氮、磷和钾的吸收。烟株内硼、氮、磷、钾之间存在显著的相互关系,其中钾与硼呈显著负相关,与氮、磷呈显著正相关。本试验条件下,高硼植烟土壤最佳施钾量为420 kg/hm~2。

Influence of Potassium on Growth and Ion Uptake of Flue-cured Tobacco in High-boron Soil

In order to investigate the alleviation effect of potassium fertilizer on high boron toxicity, this paper took K326, a flue-cured tobacco cultivar as material, and conducted a field experiment to investigate the effect of different amounts of potassium on the dry matter, economic benefit and content of boron(B), nitrogen(N), phosphorus(P) and potassium(K) of flue-cured tobacco in high-boron soil. The results showed that high-boron soil significantly increased B content in different parts of tobacco plant, and significantly reduced total N, total P, total K content, dry matter and economic benefit. Potassium significantly increased tobaocco’s dry matter and economic benefit, inhibited the uptake of B and promoted the uptake of N, P, K under high-boron soil. Meanwhile, there was a certain correlation between B, N, P and K in the tobacco plant. K and B had a significant negative correlation and significant positive correlation between N, P and K. Under the experimental conditions, the optimum potassium application rates was 420 kg/hm2 in high-boron soil.