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本文对川西、川南和川北植烟土壤氮钾养分含量和变化水平,烟叶氮钾吸收量和生物增长量进行研究。结果表明,川西和川北植烟土壤氮素供应和吸收良好,川南较差;川西和川南钾素供应和吸收良好,烟叶含钾量高,川北烟叶含钾量较低;烤烟移载后15 d左右土壤氮钾含量偏高,中期偏低,后期不足,烤烟生物量增长与氮钾供应不协调。应减少前期氮钾供应量,加大45~75 d钾素供应,保持75 d后一定量的钾素供应的同时,有效调节和改良植烟根际土壤环境,增强钾素在土壤中的生物有效性,进一步提高烤烟生物量和烟叶含钾量。
In this paper, the contents of nitrogen, potassium and their changes in tobacco-growing soils in western Sichuan, southern Sichuan and northern Sichuan, nitrogen and potassium uptake and biological growth of tobacco were studied. The results showed that there was a good supply and absorption of nitrogen in the fertilized soils of western Sichuan and northern Sichuan, but poor in southern Sichuan. The supply and absorption of potassium in western Sichuan and southern Sichuan were good, with high potassium content in tobacco leaf and low potassium content in northern Sichuan tobacco leaf. The contents of nitrogen and potassium in soil were high, low in mid-term and short in later period. The biomass of flue-cured tobacco was not coordinated with the supply of nitrogen and potassium. Should reduce the supply of nitrogen and potassium in the early stage, increase the supply of potassium 45 ~ 75 d, maintain 75 d after a certain amount of potassium supply at the same time, effectively regulate and improve tobacco rhizosphere soil environment, enhanced potassium in the soil of biological Effectiveness, to further improve the biomass of tobacco and leaf potassium content.