Selasa, 17 Juni 2014

How often to fertilize tomato plants?

Tomatoes are easy to grow and work well in yards with large garden areas or in containers on small patios or balconies. To get the biggest tomato yield, start fertilizing before you plant and periodically during the growing cycle. Then, get your kitchen ready for homemade marinara sauce and juicy tomatoes topping your sandwiches. Fertilizing the tomato plants at the correct time helps yield the largest harvest. Tomatoes are low-calorie, rich in vitamins C and A and provide lycopene that may be helpful in preventing certain cancers. Tomatoes remain productive from midsummer until fall frost if they are supplied with the nutrients they need to grow healthy and produce fruits. While special tomato fertilizers are on the market, they are rarely necessary. A general-purpose fertilizer applied regularly in the proper amounts is all that's needed to feed your tomato plants.

Initial fertilization
Tomato plants grow quite well if they are planted in fertilized soil, so turn some slow-release fertilizer into the holes you dig for your tomatoes. Dig down about 6 inches and mix the fertilizer with the soil at the bottom and sides of the hole as well as the soil you plan to use to backfill the hole around the plant's root ball. Most young tomato plants should be placed in holes about 3 inches deep, but the fertilizer and soil mixture should be about 3 inches deep under the final hole.

Subsequent fertilizations
Tomato plants need a second fertilizer treatment just after the tomatoes begin to form. As soon as you see a few defined tomatoes about the size of marbles, add another round of fertilizer. Spray the ground around the plant with a water-soluble fertilizer or turn quick-release fertilizer into the soil around the base of the plant. As the tomatoes grow, fertilize the plants every seven to 10 days until the tomatoes are ready to pick.
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Soil types
Tomatoes are fairly hardy and grow in many soil types. However, not all soil holds the fertilizer well. For dense soils with large amounts of clay, stick to 10 days between fertilizations after the tomatoes appear. Sandy soils tend to let nutrients leach away, meaning you must fertilize more often, at least every seven days.

When to fertilize?
Fertilize the tomato plant about one or two weeks before the first fruit ripens. Repeat the fertilization two weeks after you pick the first fruit and then again one month later.

Proper amount of fertilizer
Test the soil before fertilizing. This tells you which nutrients the soil is lacking. Tomatoes prefer a soil with a pH of 6.5 to 7. Work a timed-release fertilizer into the top 6 inches of the soil before planting the tomatoes. Once the proper level is obtained, treat the tomatoes with a maintenance fertilizer at 1 lb. per 100 square feet.

Types of fertilizer
Tomatoes grow best with a balanced fertilizer with equal amounts of phosphorus, nitrogen and potassium. For instance, too much nitrogen results in a leafy plant with little fruit. Avoid the use of lawn fertilizers. Use a fertilizer product that is formulated for tomatoes or a complete garden fertilizer when preparing the soil. Use a water-soluble fertilizer once the plant begins to produce fruit.

Growing needs
Plant your tomatoes in areas with full sunlight. Areas away from trees and buildings offer the highest yields. A well-drained soil is important to prevent blossom rot or root rot. Tomato plants require a consistently moist soil. Stick your finger into the top 2 inches of soil. If dirt sticks to your finger it is moist enough. Mulch such as straw, pine needles, grass clippings, compost, shredded bark and leaf mold help conserve the moisture in the soil.

Soil testing
Each garden bed provides different nutrients and soil quality. When possible, perform a soil test to verify the nutrient quality in your garden. Soil test kits are available at most garden centers and require of taking a soil sample from the garden. The kit tests the soil pH, which should be between 5.8 and 6.5 for tomatoes. Kits may also test the amount of certain nutrients, such as phosphorous, already present in the soil. Use the information from the kit to determine what fertilizers and amendments are needed prior to planting your tomatoes.

Amendments
Most beds need agricultural lime added to bring the soil pH into the optimum range. Add the lime at the rate recommended on the soil test. If you didn't perform a test, apply 3/4 cup of lime to the bed for each tomato seedling you are planting. Also add 1/2 cup of 8-8-8 analysis fertilizer for each plant. The numbers indicate the percentages of nitrogen, phosphorus and potassium in the fertilizer. Compost helps improve the quality of the soil by adding organic matter and nutrients to the bed. Work in a 2- to 4-inch layer of compost before you plant. In heavy clay soils or in sandy beds, a thick compost layer helps ensure proper water drainage and moisture retention.

Starter fertilizer
Apply a starter fertilizer after planting the seedlings. A starter solution gives the plants quick access to the nutrients they need to begin forming healthy roots and establishing in the bed. Dissolve 1 lb. of 8-8-8 fertilizer in a gallon of water. Water each plant with one cup of the solution at planting. Commercial starter fertilizers are also available. Mix and apply these as detailed on the label.

Mid-season fertilizer
Begin mid-season fertilization once the fruits begin to form on the tomato plants. Reapply the fertilizer every four to six weeks until the end of the growing season in fall to ensure the plants remain productive. Use 2 tbsp. of 8-8-8 fertilizer per plant. Do not apply the fertilizer so it touches the tomato's stem or roots, as direct contact with undissolved fertilizer can burn plants. Instead, side dress the plants with the fertilizer. Work the fertilizer into the soil about 6-inches away from the plant stems. In row plantings, apply the fertilizer between the rows.

Considerations
Tomatoes need low-nitrogen fertilizers, such as a 8-32-16 or 6-24-24. These should be applied at a rate of about 1 pound per 100 square feet. If you are only planting one or two plants, mix a couple of tablespoons of fertilizer into the soil around each plant during the applications.

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