Effects of Soil Fumigation and the Form of Nitrogen on the Growth, Yield, and Value of Tobacco Grown on Two Soil Types. I. Plant Growth and Yield
1971
Gous, Pieter J. | Terrill, T. R. | Kroontje, Wybe
During the 1967 and 1968 growing seasons flue-cured tobacco was grown on a Cecil fine sandy loam and on Appling sandy loam on adjacent sites. Soil fumigation treatments included check (none), ridge and broadcast applications. Nitrogen was applied as all nitrate, all ammonium, half nitrate-half ammonium, or half nitrate-half ammonium with a nitrate sidedressing. More rapid plant growth on the Appling soil late in the growing season resulted in a higher yield of cured leaves which was also reflected in a higher crop value. Differences in physical characteristics of the soil and especially internal drainage seem to be responsible for the better plant growth obtained on the Appling soil. Application of all fertilizer nitrogen as NH₄ resulted in the lowest yield and value of cured leaves during the first season. The NO₃-NH₄ ratio of the applied fertilizer did not affect the quality of the crop produced or the ratio of stalk to leaf weight of the growing plants. During the second season lower quality cured leaves were obtained with the application of only NO₃-N. This was apparently related to excess leaching of NO₃-N resulting in a higher percentage of low quality leaves. None of the treatments significantly affected the total particulate matter, nicotine content, or puff counts per cigarette. Seasonal differences, reflecting mainly the influence of different rainfall patterns, resulted in big differences in yield and value of cured leaves.
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