Thursday, 5 January 2006 - 5:15 PM

Crop maturity differences associated with yield compensation in skip-row cotton

C. Owen Gwathmey and Larry E. Steckel. University of Tennessee, 605 Airways Blvd., Jackson, TN 38301

Producers are interested in planting in skip-row patterns to reduce costs. Cotton planted in a skip-row pattern can partially compensate for yield lost to the skipped row, but this compensation may delay crop maturity. Objectives of this research were to determine crop maturity and yield responses to planting in a 2+1 skip-row pattern relative to solid planting at several row widths, and associated yield compensation in boll size and number. Field experiments were conducted at the Milan (TN) Experiment Station, in which ‘PM1218BG/RR' cotton was grown in solid and 2+1 skip-row patterns in 10-, 30-, and 40-inch rows. Earliness of maturity was measured by successive hand harvests, and lint yield was determined by mechanical harvesting and ginning. Yield compensation was expressed as the relative change in yield divided by the relative change in plant population density between solid and skip-row plots. Boll size and number were determined from the hand-harvested samples. Lint yields were higher in solid planting than in 2+1 skip rows, but differences were greater as row spacing increased. Yield compensation occurred in all skip-row treatments, and compensation increased as rows spacing diminished. Boll number accounted for most of the observed yield compensation. Maturity was delayed in the 2+1 skip rows relative to solid plantings, but earliness differences diminished as row spacing decreased. Results suggest that planting in narrow rows may mitigate the maturity delay maturity and yield loss associated with skip-row planting.

[ Recorded presentation ] Recorded presentation

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