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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.
Using ’Yuyan 10’ as material, the effects of different P fertilizers on the root indexes such as root dry weight and the differences of the distribution of the roots and shoots and the accumulation of mineral nutrients in the field were studied.The results showed that: The root system and the distribution of dry matter to the aerial part of flue-cured tobacco were promoted, and the maximum root dry weight, root volume, root vigor and root / shoot ratio of the tobacco plants treated with 30 kg P2O5 · hm-2 were the highest Accumulation rate appeared from 57 to 66 days and from 44 to 55 days after transplanting, and phosphorus application not only promoted the absorption of nutrients by tobacco plants, but also accelerated the maximum accumulation rate of nutrients, but also significantly promoted the accumulation of nutrients in shoot aerial parts. However, when the phosphorus application rate exceeded 30 kg P2O5 · hm-2, the above-mentioned promoting effect was weakened, and phosphorus should be rationally used to improve the quality of tobacco leaves.