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The Influence of Defoliation Timing on Yields and Quality of Two Cotton Cultivars

^a LSU AgCenter, 212-B Macon Ridge Rd., Winnsboro, LA 71295
^b North Carolina State University, P.O. Box 7620, Raleigh, NC 27695
^c North Carolina State University, Department of Crop Science, P.O. Box 7620, Raleigh, NC 27695-7620
^d LSU AgCenter, Dean Lee Research Station, 8305 East Campus Avenue, Alexandria, LA 71302-9306

View larger version (26K): [in a new window]   Fig. 1. Relationship between yield and time of defoliation based on various OBPD for two cultivars over 3 yr at Clayton, NC. Each data point represents yield at a particular OBPD measured in an individual plot.

View larger version (20K): [in a new window]   Fig. 2. Relationship between micronaire and time of defoliation based on various OBPD's for two cultivars over three years at Clayton, NC. Data are pooled over 3 yr and each data point represents micronaire at a particular OBPD measured in an individual plot.

View larger version (27K): [in a new window]   Fig. 3. Relationship between length uniformity (UI) and time of defoliation based on various OBPD for two cultivars over 3 yr at Clayton, NC. Each data point represents UI at a particular OBPD measured in an individual plot.

View larger version (22K): [in a new window]   Fig. 4. Relationship of micronaire values obtained at harvests to 1) micronaire values taken at defoliation, 2) nodes above cracked boll (NACB) taken at defoliation, and 3) the open boll percentage at defoliation (OBPD). Each data point represents micronaire values at harvest resulting from defoliating at a particular micronaire, NACB, or percentage of open boll measurement taken for an individual plot.