Effects of Topdressing Potassium Fertilizer on Potassium Supply of Red Soil and Potassium Content in Tobacco Leaves
A field plot experiment was conducted to investigate the effects of different types and application rates of potassium fertilizer on potassium supply in red soil,tobacco growth,and potassium content in tobacco leaves.Considering the conventional and 50%reduced application rates of potassium fertilizer,we designed five treatments:application of fertilizer at 120 kg/hm2 during film uncovering and hilling,application of coated potassium sulfate at 120 kg/hm2,application of coated potassium sulfate at 60 kg/hm2,application of charcoal-loaded fertilizer at 60 kg/hm2 during film uncovering and hilling,and application of charcoal-loaded potassium sulfate(60 kg/hm2).The agronomic traits,dry matter accumulation,and potassium content in leaves of tobacco,as well as the water-soluble potassium,available potassium,and slow-release potassium supply in soil,were studied.The results showed that under the conventional application rate,coated potassium sulfate presented significant slow release and increased the potassium content in tobacco leaves.Under 50%reduced application,both coated potassium sulfate and charcoal-loaded fertilizer applied during film uncovering and hilling promoted the growth and development of tobacco plants and increased dry matter accumulation.Moreover,the application of charcoal-loaded fertilizer during film uncovering and hilling effectively improved the potassium availability in soil and increased the potassium content in the middle and lower leaves of tobacco by 19.38%-40.15%and 12.94%-32.49%,respectively.In summary,under the 50%reduced application of potassium fertilizer(60 kg/hm2),the best solution for potassium fertilizer application was charcoal-loaded fertilizer applied during film uncovering and hilling,which can be promoted and applied in production.
potassium fertilizerreduced applicationflue-cured tobaccopotassium content in tobacco leaves
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