Potassium Fertigation Requirements of Drip-irrigated Strawberry

in Journal of the American Society for Horticultural Science
View More View Less
  • 1 Gulf Coast Research and Education Center-Dover, University of Florida, 13138 Lewis Gallagher Road, Dover, FL 33527-9664
  • 2 Horticultural Sciences Department, P. O. Box 110690, University of Florida, Gainesville, FL 32611-0690
  • 3 Gulf Coast Research and Education Center-Dover, University of Florida, 13138 Lewis Gallagher Road, Dover, FL 33527-9664
  • 4 Department of Statistics, P.O. Box 110560, University of Florida, Gainesville, FL 32611-0560

`Oso Grande' and `Sweet Charlie' strawberries (Fragaria × ananassa Duch.) in 1991-92 and `Oso Grande' and `Seascape' in 1992-93 were grown in a K fertilization study using polyethylene-mulched and fumigated beds. Potassium was injected weekly into the drip irrigation system at 0.28,0.56,0.84, 1.12, and 1.40 kg K/ha per day. Early, March, and total-season marketable fruit yields were not affected by K rate during either season. The average fruit weight of `Oso Grande' for the early, March, and total-season harvest periods in the 1992-93 season decreased with increased K rate. For the same harvest periods, `Seascape' average fruit weight increased, decreased, and did not change, respectively, with increased K rate. Cull fruit yield during both seasons and fruit firmness during the 1992-93 season were not affected by K rate. Petiole sap, whole leaf, and leaf blade K concentrations increased with increasing K rates on most sampling dates during both seasons. `Oso Grande' and `Sweet Charlie' produced similar total marketable fruit yields the first season, but `Oso Grande' produced higher total yields than `Seascape' during all harvest periods of the second season.

If the inline PDF is not rendering correctly, you can download the PDF file here.