Chemical composition of Oriental tobacco as depending on long-term mineral fertilization whit different norms and rates
Keywords:
tobacco, long-term fertilization, macronutrients, chemical compositionAbstract
The effects of the mineral fertilization whit different norms and rates (N0P0K0, N0P7.5K7,5, N5P0K0, N5P0K7.5, N5P7.5K7.5, N10P0K0 and N10P7.5K7.5) on nutrient concentrations in the leaves and chemical characteristics of sun-cured tobacco have been studied in a stationary field trial. A long-term fertilizer experiment with continuous tobacco cropping system was established on rendzina soil (Rendzic Leptosol) in 1966. Research was conducted during the period - 2011-2013. The results demonstrate that there was linear interaction between N and Ca content in leaves and rates of N fertilization.The concentration of K in leaves increased with an increase of potassium fertilizer level. The relationships among leaf N and Ca concentrations and content of nicotine and proteins in cured leaves were positive. Correlation coefficients among reducing sugars and nitrogen and calcium concentration in tobacco leaves were -0.944 and -0.727, respectively. Fertilization whit N5P7.5K7.5 should be considered as optimal for producing high yield and tobacco with desirable chemical composition for cigarette manufacturing.
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