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Burley tobacco quality, yield and chemical composition as affected by time of harvest



Burley tobacco quality, yield and chemical composition as affected by time of harvest



Bull Tennessee Expt Sta 230: 1-25



Comparisons of yield, quality and chemical composition were made of burley tobacco harvested at 7 stages of maturity; that is, 7 consecutive harvests at 6-day intervals beginning 1 wk. after topping. The field expts. were conducted in 1948 and 1950, both being favorable growing and curing seasons. Highest crop value was received at the 4th harvest (25 days after topping) in both seasons, 1276 and 1444 dollars per acre respectively in 1948 and 1950 seasons. In both years average crop value increased about 22% from 1st to 4th harvest due to improvement in both yield and quality. Conversely, in the period from 4th to 7th harvest value per acre decreased about 22%. Yields per acre, average price per lb., amts. in cigarette smoking grades, are also reported for each time of harvest. Duration of burn was better at early harvests than at late harvests. From 1st to 6th harvest "strip" yield for the trash grade decreased about 5%, however, in the bright leaf grade, it increased 5%. Average nicotine content of trash, lugs, and bright leaf grades increased 55% from 1st to 4th harvest and 72% from 1st to 7th harvest. Total volatile bases in these grades increased 20% from 2d to 6th harvest. Average ash content decreased from 2d to final harvest. Concns. of K , Ca and Mg and the alkalinity no. of ash for each time of harvest are also reported.

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