What nutrients affect tomato plants?

A summertime favorite, tomatoes' sweet juiciness tastes best when ripe right off the plant. Home gardeners often include this fruit in their vegetable patch or in patio containers. Tomatoes are fairly easy to grow given enough light and nutrients. They are heavy feeders and do well with additional fertilizer and organic rich soil. All plants need the same macro- and micro-nutrients but the amounts preferred by different species vary considerably.

Basic plant nutrition
Tomatoes need the basic macro-nutrients nitrogen, phosphorus and potassium for good growth. Nitrogen is a component of chlorophyll which helps in the performance of photosynthesis. It improves green leafy and stem growth. Phosphorus helps in the production of plant sugars and encourages budding and fruit production. Potassium enhances plant health and promotes the formation of a good root system. Tomatoes also need secondary nutrients such as calcium, magnesium and sulfur, which are usually found in soil.

Soil pH and structure
Without the proper pH, many important nutrients cannot be absorbed by the plant. Macro-nutrients are less available to plants with low pH. Low pH also enhances the production of microbes which break down nitrogen and sulfur. The structure of the soil affects the movement of water and the delivery of plant minerals. Structure also can limit how many minerals are held in soil for a tomato to use. Well-amended soil with the addition of compost adds food for the tomato roots and increases tilth to allow for adequate drainage.

Tomato fertilizer components
Tomato food is specially formulated for different stages of growth. Starter fertilizer will have a ratio of 2:1:2 which means two parts nitrogen, one part phosphorus and two parts potassium. As the plant begins to grow and bud it will need a slightly different formula. It will have one part nitrogen, two to three parts phosphorus and one part potassium. On a fertilizer label these amounts will appear as 10-25-10 or a similar ratio.

What nutrients give to tomatoes
The starter fertilizer has a small amount of nitrogen because soil amended with compost supplies some nitrogen initially. Additional nitrogen will be necessary to help the plant's core structure grow. The potassium is needed in higher amounts to spur the production of carbohydrates and develop the roots. As the plant matures and nears the flowering stage, the phosphorus becomes more important as it encourages flower bloom and fruit set. Phosphorus becomes the most needed mineral for the plant to form large flavorful fruits.

What nutrients should be added during the transplant of a tomato?

Often referred to as the most popular vegetables to grow, tomatoes (Solanum lycopersicum) can add some color to your garden. Whether you start them indoors from seed about six weeks before transplanting, or use store-bought transplants once night temperatures are above 55 degrees Fahrenheit, these heavy feeders rely on you to thrive. This means properly prepping the soil before transplanting and providing the nutrients the young plants need. When done right, the tomatoes will be harvest-ready in no time.

Tomatoes (Solanum lycopersicum) are one of the most commonly grown vegetable garden plants due to their variety of functions in the kitchen. Whether you're growing large slicing tomatoes for burgers and salads or growing sauce tomatoes for an Italian feast, fertilizer requirements are the same, but there are a few other factors that lead to healthy harvests.

Ways

Soil test
A soil test can determine the availability of nutrients in your garden's soil, which is critical to the survival and growth of vegetables. Perform the test early in the planning process, because any amendments you make can take about two years to have an effect. Use a commercial soil testing kit or consult your local cooperative extension service about soil testing. A soil pH between 6.0 and 6.8 is ideal for tomatoes. According to the test results, till limestone into the top 7 inches of soil to raise it, or incorporate sulfur to lower it.

Organic matter
Tomatoes aren't picky about the type of soil they grow in as long as it's fertile and drains well. In coastal areas, gardens tend to have loamy soil that's sometimes of a clay or sandy texture. To prevent clay soils from draining slowly, and sandy soils from draining too fast, work a 2-inch layer of organic matter, such as compost or grass clippings, into the top 6 to 8 inches of soil. This improves the soil structure and enhances its nutrient- and water-holding capacity while also promoting aeration.

Fertilizing
When fertilizing, avoid using a high-nitrogen fertilizer, because this triggers more foliage growth than fruit growth. To fertilize at transplanting time, dig a hole 6 to 8 inches deep and wide enough to fit the transplant. Then place 1 1/2 tablespoon of a 5-10-10 fertilizer in the hole and backfill it with 3 inches of soil. Then plant the transplant on top of this. Over time, the plant roots will grow toward the fertilizer and absorb nutrients from it.

Side-dressing
If you've provided your tomato transplants with ideal growing conditions, side-dressing them is another fertilizing option. After transplanting, once the tomatoes have grown to the size of a golf ball, dig a 1 inch deep, circular trench in a 6 inch diameter around the plant stem. Spread 1 1/2 tablespoon of a 5-10-10 fertilizer in the trench and cover it with 2 inches of soil. Then water the soil to bring the nutrients to the plant roots. Wait three weeks before repeating this process.

Nutrients

N-P-K ratio
All fertilizers have a three-digit number printed somewhere on the package. This number is known as the N-P-K ratio and tells you what percentage of nitrogen, phosphorus and potassium is in the fertilizer. These three nutrients are the most commonly deficient in soils and the three that plants need the most, including tomatoes. While each of these nutrients has a long list of benefits to plants, a basic breakdown is: nitrogen is responsible for strong, green growth; phosphorus aids in bud, bloom and fruit production; and potassium is pivotal in water uptake.

Best ratio?
If you choose to forgo a soil test -- although it's highly recommended for accuracy -- apply a complete fertilizer that is high in phosphorus and low in nitrogen. Look for an N-P-K ratio of 8-32-16 or 6-24-24 for optimum results. Apply this type of fertilizer at a rate of 1 pound per 100 square feet. These ratios are sometimes harder to come by in nurseries and garden centers; if you can't find these ratios, choose a fertilizer with 5-10-5 or 5-10-10, which are much more common. Apply these fertilizers at a rate of 2 cups per 100 square feet.

Tips for choosing
Nurseries and garden centers often have rows upon rows of different types of fertilizers, including organic and synthetic, granular and liquid. Some fertilizers are specifically marketed to different applications and chances are you'll see one designed specifically for tomatoes. Even if the fertilizer is marketed for tomatoes, still look at the ratio. Other fertilizers to look at during your search are those designed for flowers or vegetable gardens, sometimes called "Bud and Bloom," "Vegetable Garden Fertilizer" or something similar. These often have the high levels of phosphorus needed by tomatoes because this nutrient helps produce bigger, healthier buds, blooms and fruit.

Other growing tips
Tomatoes grow best in alkaline soil with a pH around 6.5, although slightly above or below this won't be detrimental if other conditions are met. They also require full sun and consistent moisture. Add organic material into the top 8 inches of soil to improve drainage. Consistent moisture is pivotal for tomatoes: those that don't receive consistent moisture, such as during a drought or from watering too much during different parts of the growing season, may develop blossom-end rot or other problems.

Fertilizers that are needed to grow tomatoes in a greenhouse

Tomato plants grown in greenhouses have the same nutrient requirements as garden-grown tomato plants. The amount and types of fertilizers needed will depend on the make-up of the soil. Because of this, testing the soil before adding fertilizers is essential. Fertilizers and amendments are added before planting, with additional fertilizers applied throughout the growing cycle. Liquid, granular, powder or another type of fertilizer can be used. If you use a commercially produced "complete" fertilizer, look for one formulated specifically for greenhouse tomato growing. Complete greenhouse fertilizers are usually low in nitrogen and high in potassium with moderate phosphorus and additional nutrients needed for tomatoes.

 

Tomato have their own unique nutritional needs compared to other vegetables or fruit crops. In greenhouses, tomatoes are grown in both ground beds, containers filled with soil, and soil-less closed hydroponic cultures and artificial media. Whatever system you use, the nutrient requirements for tomato varieties are still relatively the same, though the delivery systems may differ.

 

Tomatoes are heavy feeders. Their flower and fruit production requires high amounts of nitrogen, phosphorous and potassium -- the three major nutrients available in garden soil. Whether the vegetable is produced indoors or out, nutrient supplements are necessary to encourage high yields. Fertilizers are added as side-dressings throughout the growing season and can be applied in granules or through a mist system. The amount of fertilizers and the methods of distribution are best determined by the type of plant and its growing conditions.

Nutrients Needed to Grow Tomatoes in a Greenhouse

Indoor growing
Growing tomatoes indoors requires irrigation systems, sterile growing mediums, aeration techniques and temperature controls. One of the advantages of growing tomatoes indoors is the ability to control every aspect of the plant's environment. Such control allows a grower to produce high yield crops at any time of year. Irrigation systems often recycle water and, since most tomato fertilizers are distributed via irrigation water, the fertilizer content must be monitored to ensure that there is not a nutrient build-up or the reverse.

Irrigation systems
Drip irrigation and overhead spray systems are the dominant forms of irrigation used for tomato greenhouse crops. Home gardeners with small greenhouses may hand-water their tomatoes in a manner similar to that used on outdoor plants. The benefits of drip irrigation, however, are that the system can be set to a timer, and the fertilizer and water are evenly distributed at timed intervals. Place drip irrigation emitters near a plant's base. Overhead watering systems may contribute to foliar diseases, especially if overhead foliage isn't provided with adequate aeration.

Nutrients
Tomatoes require the major nutrients -- nitrogen, potassium and phosphorous -- as well as high amounts of calcium and magnesium. Calcium and magnesium supplements must be used alongside general fertilizers. Calcium nitrate, in concentrated form, cannot be included within a concentrated general fertilizer because of incompatible chemical reactions. Tomato growers rig their drip irrigation systems with two separate emitters and drip lines -- one for the distribution of general fertilizer and the other with the calcium nitrate mix.

Considerations
Many companies produce liquid fertilizers suited for indoor growing. Fertilizer formulas are displayed on the outside of containers. The first number in the formula indicates the amount of nitrogen available in the solution. The second number indicates the amount of phosphorous, and the third is the amount of potassium. The numbers are in a ratio. A common formula suited for tomato growing is a 15-5-15 fertilizer. This fertilizer, along with calcium nitrate supplements, will provide your indoor tomatoes with the nutrients they need to grow.

Soil Testing

A soil rich in organic matter is best for helping the tomatoes absorb and utilize nutrients. Mix in compost until you get the mixture of soil you will use for the plants. Take soil samples for testing either by a university extension service or with a home test kit. The soil test will tell you the pH of the soil, as well as whether the soil is low or high in phosphorus, nitrogen and potassium, and other nutrients, depending on the test. If pH is high, amending with peat moss or sulfur will lower it. If pH is low, adding lime will make the soil less acidic. Leaf tissue analysis through the growth cycles will tell you how much of the nutrients are being absorbed by the plants.

Nitrogen

Nitrogen is important for the growth of the leaves and stems of the tomato plant. On fertilizer labels, the nitrogen content is indicated by the first number in the N-P-K ratio. Fertilizers including the word "nitrate," such as ammonium nitrate, are good sources of nitrogen. A nitrogen deficiency is indicated by light green or yellowish leaves and pale flowers. However, too much nitrogen in the soil will result in large stems and lush leaf growth, but few fruit.

Phosphorus

Phosphorus content is the second number listed in the N-P-K ratio on the fertilizer label. Sources of phosphorus will often have "phosphate" in the name, such as monopotassium phosphate. Phosphorus is important for the growth of plant roots and aids in the formation of blooms and fruit set. Insufficient phosphorus is indicated by a purplish hue in stems and thin growth. It is not usually found in toxic amounts in the soil.

Potassium, calcium and magnesium

Potassium is the third number in the N-P-K ratio. Potassium helps the fruit form correctly and ripen well. If there is not enough potassium, the fruit can develop poorly. Magnesium deficiency is common in greenhouse tomatoes and is indicated by yellow leaf veins. Calcium deficiency can result in blossom end rot. Calcium, magnesium and potassium should be applied in equal amounts so they do not block the absorption of the other minerals if there is too much of one in the soil.

 

More information

Nutrient balance
The most important nutrient to balance properly is nitrogen. Too much nitrogen stimulates lush early foliage but produces plants that are small with soft growth, small flower clusters, poor bloom and fruit set. An 8-32-15 or 6-24-24 tomato-specific fertilizer works well because of the low level of nitrogen in these blends. Calcium nitrate is an excellent nitrogen delivery compound because it also delivers calcium, which promotes strong cell walls and disease resistance. Potassium and phosphorus also promote strong, healthy, disease- and pest-resistant plants and a bumper crop of fruit. Tomato plants normally absorb micronutrients from the soil's clay and organic fractions, but, in soil-less systems, these micro-nutrients must be provided by nutrient solutions.

Fertilizers
Commercial fertilizers for greenhouses can be obtained through horticultural supply vendors who tailor fertilizers for specific crops and for soil and soil-less systems. Different fertilizers are necessary at different stages of growth for tomato plants, particularly in the fruit production stage. Ripening tomatoes absorb potassium from other plants if insufficient amounts are found in the soil. This can cause plant stress, weakened stems, poor leaf development and crop damage. The biggest greenhouse tomato problem is too much nitrogen and too little potassium and calcium. Tomato-specific fertilizers address this problem pro-actively.

Container soil systems
Container tomato plants in greenhouses should be 18 to 24 inches apart. If you use fans to stir the air, promote pollination and dry foliage, you can space them slightly closer together. A liquid combination tomato-specific fertilizer applied according to manufacturer's directions is all you really need. Watch for symptoms of stress in leaves and flowers, test the soil and apply potassium, phosphorous or calcium as needed. Be careful not to overdo the nitrogen.

Ground bed soil systems
In open-soil greenhouses, space the plants 24 to 36 inches apart in rows 4 to 5 feet apart. If you use a combination fertilizer, apply a 0-20-20 fertilizer at 1,000 to 2,000 lbs. per acre after harvest and before the fall crop. Apply 650 to 100 lbs. an acre of 0-20-20 before the spring crop. If you test your soil and find it low in phosphate, you can apply 300 to 500 lbs. of 46 percent triple phosphate per acre. For low potassium levels, apply 300 to 400 lbs. of potassium sulfate per acre. Add calcium nitrate for a rare nitrogen deficiency. Calcium nitrate also provides needed calcium. Avoid any nitrogen fertilizers with ammonium in them for tomatoes. Apply 3.5 lbs. of calcium nitrate per 100 feet of row, stirring the top inch of soil.

Closed-system hydroponic
Hydroponic systems grow plants in troughs or tubes. The plants are anchored in gravel, sand or artificial soil-less mixes, or even without anchoring media in a nutrient film. Such systems require pumps to recirculate nutrient media at 1.5 to 2 quarts per minute. The grower must monitor pH levels and chemical balances in the nutrient solution. It must be balanced to be lower in nitrogen and higher in potassium and phosphorus than for typical vegetable crops. Commercial nutrient mixes for hydroponic tomatoes include micronutrients normally found in the soil. To prevent buildup of toxic substances exuded by root systems, change the nutrient solution every two to three weeks -- more often during peak growth periods -- and include charcoal filters in the system.

Artificial media
Bag culture soil-less systems use artificial media like rockwool in 3 to 4 cubic-foot bags. Plant two rows of tomatoes per bag spaced 16 inches apart in rows 6 feet apart. A drip irrigation system distributes the nutrient solution, adjusting the amount depending on the temperatures in the greenhouse. Nutrient solution should keep the media moist but not soggy. Collect the excess to provide drainage and prevent fertilizer salts buildup.

How much fertilizer to use when transplanting tomato plants?

Transplanting tomatoes into a nutrient-rich garden bed helps start them off right so they produce at their best and remain healthy for the entire season. Tomatoes require three main nutrients to grow well: nitrogen, phosphorus and potassium. Amending the soil with the right fertilizer before you plant the tomatoes encourages healthy root establishment, lush foliage growth, and strong flowering and fruit set.

Soil amendments
Tomatoes have specific soil needs to grow well. The plants require a soil pH between 6.0 and 6.5. If vegetables have grown well in the bed previously, the soil likely falls within this range, but a soil test can determine the exact pH and provide guidelines for adjusting it. Ground limestone amendments raise pH, while sulfur lowers pH. Apply these amendments in the amount recommended by the test, preferably at least three months before planting the tomatoes. Working a 2-inch layer of compost into the top 8 inches of soil immediately before transplanting also improves nutrition and soil quality.

Slow-release fertilizer
A slow-release fertilizer, or granular fertilizer, releases nutrients slowly so it can feed the new transplants for up to two months before you need to add more fertilizer. Balanced fertilizers, or those with a nutrient ratio of 8-8-8 or 10-10-10, supply equal amounts of nitrogen, phosphorus and potassium, along with trace minerals the plants need. Work 1/2 cup of fertilizer into the bed for each tomato you are planting. Incorporate the fertilizer with the top 6 inches of soil before transplanting so the nutrients are worked into the root zone area of the garden bed.

Starter fertilizer
Although starter fertilization isn't necessary if you use a slow-release fertilizer before transplanting, the starter solution can encourage healthy initial growth until the tomato roots are established enough to begin drawing nutrients out of the soil. Dissolve 1/2 pound of an 8-8-8 slow-release fertilizer in 5 gallons of warm water. Water each tomato plant with 1 cup of the solution immediately after transplanting it in the garden. You can also use a purchased starter formula made for tomatoes or vegetables.

Maintenance fertilization
If the tomatoes are properly fertilized when you transplant them outdoors, they won't require any more fertilizer until they begin developing their first fruits. Apply 2 tablespoons of the slow-release 8-8-8 fertilizer for each tomato plant. Work the fertilizer into the top 2 or 3 inches of soil, about six inches away from the plant stem, then water thoroughly after application. Repeating this application every four to six weeks keeps the plants at peak production through the remainder of the growing season.

What to feed tomatoes for really fast growth?

Since the 1800s, tomatoes have made regular appearances on American dinner plates as well as in home gardens. Garden favorites, tomato plants (Lycopersicon spp.) are fast growing and produce high yields of fruits. In order to support their rapid growth and development, tomato plants need a steady supply of food, which they glean from soil nutrients and well-timed applications of fertilizer throughout the growing season.

Fertilizer use
Heavy feeders such as tomato plants can deplete garden soil of its nutrient reserves quickly. Therefore, before planting, have garden soil tested to determine its current nutrient levels. When a specific nutrient is found to be deficient in the soil, use fertilizer to restore the missing element. Knowledge of the soil's composition is also important so that fertilizer feedings can be applied in the correct amount for fast tomato growth and optimal development.

Complete fertilizer
Depending on soil composition, a complete fertilizer containing the three macronutrients – nitrogen, phosphorus and potassium – in ratios of 5-10-10, 6-12-18 or 10-10-10 provide the nutrients required for fast tomato development. Sufficient nitrogen is necessary because it plays a key role in the rapid growth of the tomato vines and should be applied in regular biweekly or monthly intervals, depending on soil nutrient levels, throughout the growing season, as long as new fruits are being set. Good reserves of phosphorus also are needed for fast-growing tomatoes because that nutrient is responsible for well-developed root systems, which are essential for planting feeding. The third macronutrient, potassium, builds strong stems and wards off diseases, ensuring healthy growth of young tomato plants.

Organic options
Organic gardeners use aged manure, bone meal and fish emulsion to provide soil nutrients to maximize tomato plant growth; determining the correct balance, however, can be more difficult than when using a commercial complete fertilizer. Manure is a good source of nitrogen and potassium, and blood and bone meal can be used to boost levels of nitrogen and phosphorus in soil. Ash, oyster shell flour, seaweed, phosphate rock and compost also can be used to provide added nutrients to promote healthy and fast-growing tomato plants.

Micronutrients
In addition to macronutrients, micronutrients such as magnesium are essential for fast-growing tomato plants. If magnesium levels are deficient, the plants can suffer from stunted growth because that nutrient helps young plants properly ingest nitrogen and phosphorus, which are critical to healthy plant development. If a garden has a low magnesium level, use dolomite lime or a foliar spray composed of water and Epsom salt to increase feeding supplies in the soil.

Improper feeding
Improper feeding of tomato plants can cause problems. For example, too much nitrogen results in tall tomato plants with many leaves but few tomatoes, whereas insufficient nitrogen produces few fruits as well as slow-growing plants. Overfeeding also can cause leaf burning or plant death. So always apply fertilizers according to their package instructions.

Never Plant Bradford Pear Trees!!!

We are going to stray a little from the beaten path today and discuss a tree that I see planted everywhere - the Bradford Pear tree (Pyrus calleryana). 

This tree is a disaster, and the fact that it is still planted anywhere is a travesty.  Let us examine the ways in which this tree is unworthy of planting.

First, it is invasive.  The Bradford Pear (actually known as Callery Pear elsewhere) was originally imported from China.  It is extremely fast growing, and of course this is one of the reasons for its popularity.  A single domesticated Bradford Pear cannot produce fertile offspring, but because these trees are planted so much in the suburbs, two trees within pollinating distance from each other can produce fertile seeds.  These seeds become easily established and take over bare fields.  The Bradford Pear is listed as invasive in Tennessee, Illinois, Alabama, Georgia, and South Carolina.  

Second, it smells.  The Bradford Pear smell is frequently described as that of rotting fish, rotting flesh, chlorine, and other more unpleasant things.  When planted en masse this smell is quite noticeable.  Few other flowering trees have unpleasant odors, most being pleasing.

Third, Bradford Pears only live about 25 years.  This is shorter lived than many shrubs, and most home owners don't want to replace their main landscape tree with something new (and smaller) in just 25 years.  

Finally, the Bradford Pear is extremely prone to breaking in any inclement weather.  We have seen half of a Bradford Pear split off in a gentle rain (perhaps the raindrops were too heavy?) with no wind.  Wind, of course, will also break many branches.  The reason for this is the sharp (acute) angle the branch forms with the trunk of the tree.  As the Bradford Pear is almost always planted for its looks, a large segment missing from the tree after a few years is hardly ideal.

This Bradford Pear almost completely collapsed in a moderate rain

So what trees should be planted in place of the Bradford Pear?  Well, there is no simple answer, but we do have several suggestions.

The Yoshino Cherry, also imported from Asia, is a beautiful, pleasantly fragrant tree with a similar maximum height.  It grows in zones 5-8, and has a medium growth rate.  It also has a rounded canopy, but not quite to the extent of the Bradford Pear.  

For a fast growing but strong and long-lived shade tree, we recommend the Northern Red Oak.  This tree will grow in zones 3-8 and is much faster growing than most oaks (on par with silver maples, another terrible tree to plant).  It has a red fall color similar to the Bradford Pear.  While the Bradford Pear is famously weak-limbed and short lived, the Red Oak can live up to 500 years, adding beauty and value to your property.  


Won't planting different trees lead to slower growth?  Not necessarily.  When most homeowners purchase trees, they buy large, containerized trees from the local big box retailer.  They assume that since these trees are large now (at least in terms of a canopy) they will grow fast and remain larger.  This is not the case.  Roots and leaves determine the speed of growth of the tree, and when there is a mismatch between the two (like with trees bought in a container), these trees languish for years with barely any growth (if they survive).  A much better option is to buy small, bare root trees, purchased and shipped to you from ArborDay or another nursery like Stark Brothers.  Arbor Day is not for profit and trees there are especially affordable with a $15 membership.

When these smaller, bare root trees are planted with the Groasis Waterboxx, you never have to water them.  Not only does this conserve water, but the Waterboxx can be removed once the tree outgrows it (usually 1-2 years) and reused multiple times.  The Waterboxx planted tree has deeper roots than a store bought tree (see why on our website), and will be able to access deeper soil water held in capillaries. This deeper root structure supports the tree in time of drought.  Be the first in your area to start growing healthy shade trees with the Groasis Waterboxx.   Buy the Waterboxx here. We would love to hear your comments below - to leave one, please click on "Comments".

A seed grown oak tree planted with the Waterboxx

Variety: "1534" El Salvador Review

Specifications:

Skin Color: Red
Flesh Color: Red, Pink
Fruit Shape: Elongated
Fruit Size: Small
Leaf Type: Regular leafed
Tomato Plant Height: 5 feet, 6 feet
Best Uses: Paste

General Plant Information

Plant Habit: Vine
Life cycle: Perennial
Sun Requirements: Full Sun, Full Sun to Partial Shade
Minimum cold hardiness: Zone 11 +4.4 °C (40 °F) to +7.2 °C (45 °F)
Fruit: Showy, Edible to mammals, Edible to birds
Flower Color: Yellow
Flower Size: Under 1"
Uses: Vegetable, Suitable as Annual
Toxicity: Leaves and roots are poisonous
Propagation: Other methods: Cuttings: Stem
Miscellaneous: Deer Resistant, Rabbit Resistant