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This article in AJ

  1. Vol. 63 No. 4, p. 611-613
     
    Received: Nov 20, 1970


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doi:10.2134/agronj1971.00021962006300040029x

Response of ‘Atlas’ Cotton to Variations in Plants Per Hill and Within-Row Spacings1

  1. B. S. Hawkins and
  2. H. A. Peacock2

Abstract

Abstract

To determine the effects of variations in plants per hill, spacing arrangements, and plant populations on agronomic and fiber properties of cotton (Gossypium hirsutum L.) we conducted a 2-year study at Experiment, Ga., using ‘Atlas’ cotton on Cecil scl. Each trial was a randomized block split-plot with number of plants (2, 3, 4, or 5 per hill) as the main plots and within-row spacings (20, 40, and 60 cm) as subplots. The variations in plants/ hill and spacings represent a range in population of 32,110 to 240,825 plants/hectare.

Significant differences in yield due to years and to within-row spacings were found, but number of plants per hill did not affect yield. The plants in hills spaced 20 and 40 cm apart produced higher yields than the plants spaced 60 cm. A population range of 96,330 to 144,495 plants/ha produced best yields.

We found differences in lint percentage and boll size due to years, plants/hill, and within-row spacings. Lint percentage was highest and boils were largest from plants at the 60-cm spacing and when there were 2 plants/hill. The only significant difference in seed size was that associated with years. Fiber length differences were due to years, p/ants/hill, and within-row spacings; the longest fibers were produced by 3 plants/hill and by plants at 40-cm spacing. Differences in fiber strength were due to years and within-row spacings; the strongest fibers were produced by plants spaced 60 cm apart. Fiber fineness was influenced by years only.

The following interactions were found:

  1. Years × plants/hill: boll size, fiber length, fiber fineness, yield, lint percentage, and seed size.

  2. Years × spacings: lint percentage, boll size, and fiber fineness.

  3. Plants/hill × spacings: lint percentage.

There were no significant second order interactions.

Although mean differences Were statistically significant, they are so small that they may be of no practical value. However, results demonstrate the relative stability of the characters stodied over a wide range of planting patterns and population densities.

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