The influence of nitrogen and potassium fertilization on the yield, quality and chemical composition of burley tobacco

Link, L.A.; Terrill, T.R.

Tobacco International 184(14): 26-29

1982


Accession: 001139116

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Abstract
Field trials were conducted on 4 soil types high in potassium in 1973-75. Treatments consisted of a uniform application of 100 kg P/ha with 110, 170 and 225 kg N/ha and 280, 440 and 600 kg K/ha. After curing, yield grade and price were determined and nicotine, nitrogen and mineral contents were analysed. Yields increased with increase in N fertilizer, but differences at 170 and 225 kg/ha were not significant. The high N rate affected curing, especially under low humidity conditions. 110 kg N was too low for max. yield and quality. Except for higher concentrations of K in cured leaves at higher rates of K, there were no significant differences in yield or quality as a result of K, nor were effects of the altered ratio of N:K found. Higher rates of N increased the nicotine and N levels of cured leaves but did not affect other chemical constituents. The levels of P, Ca and Mg in cured leaves were not affected by rate of N or K. Significant year and location interactions indicated that local conditions influenced yield, price/kg and chemical composition, but there were no significant treatment by yr or treatment by location interactions and this indicated consistent responses to nutritional treatment.