Cotton response to row pattern and plant density: Part II. Boll distribution

Studies have shown cotton (Gossypium hirsutum L.) can sustain high yields at various row spacings and plant densities. The ability of cotton to compensate is due to boll distribution. There are numerous studies evaluating the effects of skip-row production and narrow row spacing on boll distribution. However, very little research is available evaluating the effects of wide row spacing and reduced plant density on boll distribution. Studies were conducted to determine how boll distribution is affected by plant density and row spacing. The effects of plant density and row spacing on boll distribution in cotton were investigated in Starkville, MS, on a Leaper silty clay loam (fine, smectitic, nonacid, thermic Vertic Epiaquepts) and in Stoneville, MS, on a Beulah very fine sandy loam (Coarse-loamy, mixed, active, thermic Typic Dystrudepts). Boll distribution was influenced by row spacing and plant density. As plant density increased regardless of row spacing, a greater percentage of bolls by weight are oriented toward the top of the plant. At a wider row spacing, a greater percentage of total yield occurred at positions 2, 3, 4, and 5.