114 CALIBRATING PLANT SAP QUICK TESTS FOR NO, AND K+ ON WINTER SNAP BEANS

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  • 1 Dade Co. Coop. Ext. Serv., 18710 SW 288 St., Homestead, FL 33030
  • | 2 TREC, 18905 SW 280 St., Homestead, FL 33031
  • | 3 Dept. of Hort. Sci., U. of Fla, P.O. Box 110960, Gainesville, FL 32611
  • | 4 Dept. of Soil & Water Sci., U. of Fla., P.O. Box 110510, Gainesville, FL 32611

Seventy-five percent (75%) of U.S. produced winter snap beans are grown on limestone soils in southern Dade County, Florida Since this crop requires 60-70 days from planting to harvest, growers need information to make changes in fertilizer practices on an almost instantaneous basis. As part of a study to calibrate soil tests with yield responses to different levels of applied fertilizers, plant sap quick tests are being calibrated with laboratory analyses of whole leaf samples. Beans were grown at two locations -- in a grower's field and at the University of Florida Tropical Research & Education Center (TREC). Samples were taken simultaneously for both plant sap quick tests using petioles and for whole leaf tissue analyses. Results and how these have been extended to local growers will be presented.

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