不同钾肥组合对土壤养分及晒红烟烟叶钾素积累的影响

以晒烟品种大叶黄为材料,通过大田试验研究了不同钾肥处理土壤p H值、有效硫、速效钾等5种土壤养分指标在晒红烟整个生育期内的变化规律以及烟叶钾素含量及积累量,并就土壤养分含量与烟叶钾素状况进行相关分析,找出提高晒红烟烟叶钾积累量的最佳钾肥配施组合及影响烟叶钾素积累的关键土壤因子。结果表明,生物钾肥和硫酸钾配施处理(T4)土壤养分含量最有利于烟株生长及烟叶钾积累量增加,烟叶干物质积累量达143.5 g/株,烟叶钾含量13.39 mg/g,烟叶钾积累量1.92 g/株;土壤有效硫是影响当地晒红烟生长前期钾含量的关键土壤因子,土壤速效钾含量与整个生育期内烟叶钾素积累量均呈显著或极显著正相关关系,且能显著提高中后期烟叶钾含量。

Analysis on effects different potassium fertilizer combinations on soil nutrients and potassium accumulation in red sun cured tobacco

With the sun-cured tobacco variety ( Dayehuang) , a field experiment was conducted to study the variation of soil nutrients in different growing periods and potassium concentration and accumulation in tobacco leaves. The relationship between soil nutrients concentration and potassium in tobacco leaves was analyzed in order to identify the best potassium fertilizer combi-nation that could improve the accumulation of potassium and find the most important soil nutrients factors that affected the potas-sium accumulation. Results showed that the treatment T4 which applied biological potassium fertilizer combined with K2 SO4 was the best. It had the highest dry matter accumulation, potassium concentration and potassium accumulation, which was respec-tively 143. 5 g/plant, 13. 39 mg/g and 1. 92 g/plant. Available sulfur mainly affected potassium concentration in the early growth stage. Available potassium concentration had a significantly or very significantly positive relation with potassium accumu-lation of tobacco leaves, and improved the potassium concentration of tobacco leaves in middle and later stages.