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Agronomy Journal Abstract -

Nitrogen Concentrations of Cotton Leaves, Buds, and Bolls in Relation to Age and Nitrogen Fertilization1

 

This article in AJ

  1. Vol. 68 No. 4, p. 617-621
     
    Received: July 3, 1975


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doi:10.2134/agronj1976.00021962006800040022x
  1. A. C. Thompson,
  2. H. C. Lane,
  3. J. W. Jones and
  4. J. D. Hesketh2

Abstract

Abstract

Our plant growth models depend on a nitrogen economy in the plant as a limit for the initiation of new organs as well as the slowing of growth or abscission of plant organs. To improve our N-balance model, we needed better information about possible organ age effects for plants growing under different N-levels.

Leaf and fruit N and N-effects upon morphology at four preplanting soil nitrogen levels of 0, 67, 134, and 201 kg N/ha were studied in cotton (Gossypium hirsutum) in the field and greenhouse. Three sets of leaves and fruit were monitored for N-content throughout the season. N-concentration in leaves from each N-treatment decreased (6 to 2%) as the season progressed. Regression analysis of these data indicated that the N-concentration dilution was not linear with time. Seventy-nine percent of the variation in N-concentratlon could be accounted for by N-application rate and time in growing season. Regression analysis of fruit data indicated that the dilution of N-concentration (4.5 to 1.5%) was linear with N-application rate. However N-concentration dilution was significant for young fruit from older plants. In plants grown both in the field and greenhouse at the four N-levels, the flowering rule time values (days/flower) increased with lower N-rates. There was a delay in maturity of floral buds in the high N-treatment plants, but no delay in the time required for boll set.

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