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Table 2. Sufficiency concentration ranges for plant leaf petiole fresh sap nitrate-nitrogen and potassium for <br /> Florida-grown vegetables. <br /> Nutrient concn <br /> Petiole sap Whole-leaf <br /> (mg•liter') dry wt(g•kg') <br /> Crop Growth stage Nitrate-N K N K <br /> Broccoli and collard Six-leaf stage 800-1000 NA' 35-50 35-45 <br /> Just before first harvest 500-800 3045 15-40 <br /> First harvest 300-500 30130 15-40 <br /> .- Cucumber First blossom 800-1000 NA 40-50 20-30 <br /> Fruit 8 cm long 600-800 25-50 20-30 <br /> First harvest 400-600 25-35 15-25 <br /> Eggplant First fruit(5 cm long) 1200-1600 4500-5000 45-55 45-60 <br /> ` First harvest 1000-1200 40004500 45-50 35-50 <br /> Midharvest 800-1000 35004000 3545 30-40 <br /> Muskmelon First blossom 1000-1200 NA 45-50 50-60 <br /> .. First fruit 5 cm long 800-1000 40-50 45-50 <br /> First harvest 700-800 3545 2040 <br /> Pepper First flower buds 1400-1600 3200-3500 45-50 50-60 <br /> First open flowers 1400-1600 3000-3200 40-45 45-50 <br /> Fruit half-grown 1200-1400 3000-3200 40-45 40-50 <br /> First harvest 800-1000 2400-3000 35-40 3545 <br /> Second harvest 500-800 2000-2400 25-30 30110 <br /> Potato Plants 20 cm tall 1200-1400 4500-5000 30-60 35-60 <br /> First open flowers 1000-1400 4500-5000 30-40 30-50 <br /> 50%Flowers open 1000-1200 40004500 3040 3040 <br /> 100%Flowers open 900-1200 3500-4000 2540 25-40 <br /> Tops falling over 600-900 2500-3000 20-30 15-30 <br /> Squash First blossom 900-1000 NA 30-50 30-50 <br /> First harvest 800-900 30-50 20-30 <br /> Tomato(field) First buds 1000-1200 35004000 30-50 40-50 <br /> ` <br /> First open flowers 600-800 35004000 3540 35-40 <br /> Fruit 2 cm in diameter 400-600 3000-3500 3540 3540 <br /> Fruit 5 cm in diameter 400-600 3000-3500 3040 30-40 <br /> .. First harvest 300400 2500-3000 25-35 25-35 <br /> Second harvest 200-400 2000-2500 20-35 20-30 <br /> Tomato(greenhouse) Transplant to second cluster 1000-1200 4500-5000 40-60 40-50 <br /> Second cluster to fifth cluster 800-1000 4000-5000 40-50 35-40 <br /> ` Harvest season(Dec.-June) 700-900 35004000 3540 25-35 <br /> Watermelon Vines 15 cm long 1200-1500 4000-5000 50-60 40-50 <br /> First fruit 5 cm long 1000-1200 4000-5000 40-50 3540 <br /> ` Fruit one-half mature 800-1000 35004000 3540 25-35 <br /> At first harvest 600-800 3000-3500 30-40 20-30 <br /> Not available <br /> r <br /> r <br /> 10 <br />