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This article in AJ

  1. Vol. 62 No. 3, p. 377-380
    Received: Oct 11, 1969



Yield and Leaf Area of Type 41, Pennsylvania Broadleaf, Tobacco as Affected by Variety and Plant Population1

  1. John O. Yocum and
  2. Guy W. McKee2



Studies in southeastern Pennsylvania utilizing two recommended varieties of Type 41, Pennsylvania broadleaf, tobacco indicated that conventional plant populations (13,000 to 15,000 per ha) may be too low for optimum yield of cured leaf. While leaf area per plant decreased as population increased, the decrease was more than compensated for by the increased number of plants. In 1965, nearly normal as regards precipitation, leaf area indices (leaf area/unit land area) just prior to harvest were, respectively, 5.54, 6.14, and 8.10 for 10,500, 14,600, and 20,900 plants/ha. Leaves were more erect at the high population than at the other two populations studied. In 1966, a relatively dry year with precipitation 56% of normal, leaf area indices were, respectively, 2.30, 3.68, and 5.32 for 9,000, 16,100, and 24,600 plants/ha. At all populations, leaves were less erect in 1966 than in 1965. Leaf quality was not significantly affected by plant population. Both total yield of cured leaf and gross cash return increased as population increased.

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