Part 5 of 5
Beans, Southern peas, and green peas: light-medium feeders; side-dress beans, if necessary, when pod set is heavy. Excess N delays flowering. Plants produce some N for their own use but peas produce less than beans.
Beet, Swiss chard, spinach, callaloo: heavy feeders
Brussels sprouts, broccoli, cauliflower- heavy feeders; side-dress 3 weeks after transplanting (side-dress broccoli a second time after central head is harvested to encourage small heads on side shoots).
Cabbage, kale, turnip, collards- medium feeders; side-dress 3 weeks after transplantingRadish: light feeder; avoid excess N.
Carrot: light-medium feeder.
Lettuce: medium-heavy feeder; romaine and crisphead types may require side-dressing.
Okra: heavy feeder; side-dress after first fruits form.
Onion and garlic: heavy feeders; side-dress onion once as bulbs enlarge and side-dress garlic twice- mid-April and mid-May.
Leek: light-medium feeder; side-dress in May or June.
Cucumber, squash, melon, pumpkins: medium feeders; side-dress when fruits start to form.
Sweet corn: heavy feeder; side-dress when plants are 12-18 inches tall and when plants start tasseling.
Sweet potato: medium feeder.
Tomato, tomatillo, pepper, eggplant, potato: heavy feeders; side-dress when fruits or tubers first form. Epsom salt (magnesium sulfate) does not prevent blossom-end rot. Don’t add it to the soil unless soil testing shows a magnesium deficiency.
Asparagus, rhubarb, horseradish: medium-heavy feeders.
Prior to planting, prepare the bed as early as possible and enrich it with compost and/or manure. Apply one inch of compost around plants yearly. Fertilize in early spring and after harvest if needed.
An excerpt from the article “Fertilizing Vegetables“, by Jon Traunfeld, Director HGIC, Extension Specialist, Fruits, and Vegetablescourtesy of the University of Maryland.