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中文摘要：
以‘豫烟10号’为材料,研究大田生育期内不同磷肥用量对烤烟根干质量等根系指标的影响,以及根系和地上部物质分配、矿质营养积累的差异.结果表明：施磷能显著促进烤烟根系发育和干物质向地上部的分配,30 kg P2O5·hm-2处理烟株具有最大的根干质量、根体积、根系活力和最小的根冠比.烤烟根系和叶片对养分的最大积累速率依次出现在移栽后57~66 d和44~55 d,施磷不仅能促进烟株对养分的吸收,使养分最大积累速率提早出现,而且能显著促进烟株地上部的养分积累,但当施磷量超过30 kg P2O5·hm-2时,上述促进作用反而减弱.在生产上应合理施磷,以提高烟叶品质.
英文摘要：
Using ‘Yuyan 10’as the material,the effects of different phosphorus fertilizer application on root characteristics of tobacco,such as root dry mass and the difference of dry matter distribution and mineral nutrient accumulation between its above and underground parts were investigated. The results showed that the growth of flue-cured tobacco root system and the distribution of dry matter to the aboveground part were significantly promoted by phosphorus fertilizer application. The application of 30 kg P2O5·hm-2led to the maximums of root dry mass,root volume,root activity and the minimum of root to shoot ratio. The maximum nutrient accumulation rates of root and leaf appeared 57- 66 days after transplanting and 44- 55 days after transplanting,respectively. Phosphorus could not only promote the mineral nutrition absorption of tobacco and the earlier appearance of maximum nutrient accumulation,but significantly promote the nutrient accumulation of the aboveground part. But,the positive effects described above would be weakened when the amount of phosphorus fertilizer was more than 30 kg P2O5·hm-2. Therefore,it’s necessary to control the amount of phosphorus application to improve the quality of tobacco leaves.
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