Plants

Hydroponic tomatoes are the tomato plants that are grown and catered to while in nutrient solution instead of being in the soil.

Hydroponics can be an economical alternative, capable of delivering fresh luscious and healthy fruit all through the year.

Hydroponics can deliver fresh fruit that is as tasty as outdoor grown tomatoes from your local grocery store or farmer's market. The main advantage is that you can grow this summer fruit all through the year, even in winters.

For beginners it is not best option to grow tomato in hydroponics because all fruit plants require more inputs and care than leafy greens and herbs. This includes careful monitoring nutrient mixes, and adequate lighting, not to mention a lot of maintenance and pruning. And tobacco mosaic virus, fungal blight, and various bacterial infections can kill your crop. Whiteflies, many worms, and spider mites can all appear on your indoor grow area, eating and killing your tomatoes.

Tomatoes can be growing in the following ways

• Growing tomatoes from seed
• Growing tomatoes from saplings

Growing tomatoes from Saplings: -

• Saplings are the easiest route to having your own hydroponic grow system. You can buy these from your local hydroponics/garden store.
• But using saplings of tomatoes grown outdoors is not a good idea for a hydroponic system. Seeds germinated in outdoor soil could be contaminated by pests and germs.
• Just one infected seedling is enough to destroy an entire crop. So, hydroponic veterans prefer to grow their seedlings indoors.

Growing tomatoes from seed

The most important of growing tomatoes from seed is to get good quality seeds. There are many varieties of tomatoes. Almost 300 to 400 varieties are there. The varieties differ in the following ways

• Fruit shape (Cherry tomato)
• Fruit color (Yellow cherry, Black prince)
• Fruit size / weight (beefsteak tomato)
• Plant growing habit (indeterminate & Determinate)
• Taste and Flavor

Tomatoes are an excellent summer fruiting vegetable to grow using all methods of aquaponics & hydroponics, although physical support is necessary. Given the high nutrient demand of tomatoes, especially potassium, the number of plants per unit should be planned according to the fish biomass, in order to avoid nutrient deficiencies. A higher nitrogen concentration is preferable during early stages to favor plants’ vegetative growth; however, potassium should be present from the flowering stage to favor fruit settings and growth.

Tomatoes prefer warm temperatures with full sun exposure. Below 8–10°C the plants stop growing, and night temperatures of 13–14°C encourage fruit set. Temperatures above 40°C cause floral abortion and poor fruit setting.

There are two major types of tomato plants:

Determinate (seasonal production) and indeterminate (continuous production of floral branches). In the first type, plants can be left to grow as bushes by leaving 3–4 main branches and removing all the auxiliary suckers to divert nutrients to fruits. Both determinate and indeterminate varieties should be grown with a single stem (double in case of high plant vigor) by removing all the auxiliary suckers. However, in determinate varieties, the apical tip of the single stem has to be cut as soon as the plant reaches 7–8 floral branches in order to favor fruiting. Tomato rely on supports that can be either made of stakes (bush plants) or bound to vertical plastic/nylon strings that are attached to iron wires pulled horizontally above the plant units.

Planting Instructions: -

• Transplant the seedlings into units 3–6 weeks after germination when the seedling is 10–15 cm and when night-time temperatures are constantly above 10°C.
• In transplanting the seedlings, avoid waterlogged conditions around the plant collar to reduce any risks of diseases.
• Once the tomato plants are about 60 cm tall, start to determine the growing method (bush or single stem) by pruning the unnecessary upper branches.
• Remove the leaves from the bottom 30 cm of the main stem to favor a better air circulation and reduce fungal incidence.
• Prune all the auxiliary suckers to favor fruit growth.
• Remove the leaves covering each fruit branch soon before ripening to favor nutrition flow to the fruits and to accelerate maturation.

Pollination: -

The wind, bees and other insects pollinate tomatoes naturally outdoors. As a hydroponic grower, you must perform the job manually. Transfer pollen using a small paintbrush or cotton swab by dabbing the tip on the stigma of each flower. This procedure is best done between 9 a.m. and 1 p.m. when the flower petals are bent backwards, exposing the stigma. You can introduce bumblebees to do the job if you have a greenhouse.

Harvesting: -

For best flavor, harvest tomatoes when they are firm and fully colored. Fruits will continue to ripen if picked half ripe and brought indoors. Fruits can be easily maintained for 2–4 weeks at 5–7°C under 85–90 percent relative humidity.

 

 

 

 

 

 

 

 

 

 

 

There are many similarities between in-ground soil based agriculture and soil less production, While the basic  plant biology is always same. However it is worth investigating major differences between soil and soil-less production in order to bridge the gap between traditional in-ground practices and newer soil-less techniques.   Generally the differences are between the use of fertilizer and consumption of water, the ability to use non-arable land, and overall productivity. In addition, soil-less agriculture is typically less labor-intensive. Finally, soil-less techniques support monocultures better than does in-ground agriculture.

Fertilizer:-

Soil chemistry, especially relating to the availability of nutrients and the dynamics of fertilizers, is a full discipline and fairly complex. Fertilizer addition is required for intensive in-ground cultivation. However, farmers cannot fully control the delivery of these nutrients to plants because of the complex process occurring in the soil, including biotic and abiotic interactions. The sum of these interactions determines the availability of the nutrients to the plant roots. Conversely, in soil-less culture, the nutrients are dissolved in a solution that is delivered directly to the plants, and can be tailored specifically to plant's needs.  Plants in soil-less culture grow in contained inert media. These media do not interfere with the delivery of nutrients, which can occur in soil, in addition, the media physically support the plants and keep the roots wet and aerated. Moreover, with in-ground agriculture, some of the fertilizers may be lost to weeds and runoff, which can decrease efficiency while causing environmental concerns. Fertilizer is expensive and can make up a large part of the budget for in-ground farming.
The tailored management of fertilizer in soil-less agriculture has two main advantages. First, minimal fertilizer is lost to chemical, biological or physical processes. These losses decrease efficiency and can add to the cost. Second, the nutrient concentrations can be precisely monitored and adjusted according to the requirements of the plants at particular growth stages. This increased control can improve productivity and enhance the quality of the products.

Water Use:-

Water use in hydroponics and aquaponics is much lower than in soil production. Water is lost form in-ground agriculture through evaporation from the surface, transpiration through the leaves, percolation into the subsoil, runoff and weed growth. However, in soil-less culture, the only water use is through crop growth and transpiration through the leaves. The water used is the absolute minimum needed to grow the plants, and only a negligible amount of water is lost for evaporation from the soil-less  media. Overall, aquaponics uses only about 10 percent of the water needed to grow the same plant in soil. Thus, soil-less cultivation has great potential to allow production where water is scarce or expensive.

Utilization of non-arable land:-

Owning to the fact that soil is not needed, soil-less culture methods can be used in areas with non-arable land. One common place for aquaponics is in urban and peri-urban areas that cannot support traditional soil agriculture.  Aquaponics can be used on the ground floor, in basements (using grow lights) or on rooftops. Urban-based agriculture can also reduce the production footprint because transport needs are greatly reduced. Urban agriculture is local agriculture and contributes to the local economy and local food security. Another important application for aquaponics is in other areas where traditional agriculture cannot be employed. Such as in area that are extremely dry (deserts and other arid climates), where the soil has high salinity (coastal and coral sand islands) where the soil quality has been degraded through over-use of fertilizers or lost because of erosion or mining, or in general where arable land is unavailable owing to tenure, purchase costs and land rights. Globally, the arable land suitable for farming is decreasing, and aquaponics is one method that allows people to intensively grow food where in-ground agriculture is difficult or impossible.

Productivity and yield:-

The most intensive hydroponic culture can achieve 20–25percent higher yields than the most intensive soil-based culture, although rounded down data by hydroponic experts claim productivity 2–5 times higher. This is when hydroponic culture uses exhaustive greenhouse management, including expensive inputs to sterilize and fertilize the plants. Even without the expensive inputs, the aquaponic techniques described in this publication can equal hydroponic yields and be more productive than soil. The main reason is the fact that soil-less culture allows the farmer to monitor, maintain and adjust the growing conditions for the plants, ensuring optimal real-time nutrient balances, water delivery, pH and temperature. In addition, in soil-less culture, there is no competition with weeds and plant benefit from higher control of pests and diseases.

Reduced Workload:-

Soil-less culture does not require ploughing, tilling, mulching or weeding. On large farms, this equates to lower reliance on agriculture machinery and fossil fuel usage. In small-scale agriculture, this equates to an easier, less labor-intensive exercise for the farmer, especially because most aquaponic units are raised off the ground, which avoids stooping. Harvesting is also a simple procedure compared with soil-based agriculture, and products do not need extensive cleaning to remove soil contamination. Aquaponics is suitable for any gender and many age classes and ability levels of people.

Sustainable monoculture:-

With soil-less culture, it is entirely possible to grow the same crops in monoculture, year after year. In-ground monocultures are more challenging because the soil becomes “tired”, loses fertility, and pests and diseases increase. In soil-less culture, there is simply no soil to lose fertility or show tiredness, and all the biotic and abiotic factors that prevent monoculture are controlled. However, all monocultures require a higher degree of attention to control epidemics compared with polyculture.

Increased complication and high initial investment:-

The labor required for the initial set-up and installation, as well as the cost, can discourage farmers from adopting soil-less culture. Aquaponics is also more expensive than hydroponics because the plant production units need to be supported by aquaculture installations. Aquaponics is a fairly complex system and requires daily management of three groups of organisms. If any one part of the system fails, the entire system can collapse. In addition, aquaponics requires reliable electricity. Overall, aquaponics is far more complicated than soil-based gardening. Once people are familiar with the process, aquaponics becomes very simple and the daily management becomes easier. There is a learning curve, as with many new technologies, and any new aquaponic farmer needs to be dedicated to learn. Aquaponics is not appropriate for every situation, and the benefits should be weighed against the costs before embarking on any new venture.

Category		Soil-based	Soil-less
Production	Yield	Variable, depending on soil characteristics and management.	Very high with dense crop production.
	Production Quality	Dependent on soil characteristics and management. Products can be of lower quality due to inadequate fertilization/treatments.	Full control over delivery of appropriate nutrients at different plant growth stages. Removal of environmental, biotic and abiotic factors that impair plant growth in soil (soil structure, soil chemistry, pathogens, pests).
	Sanitation	Risk of contamination due to use of low quality water and/or use of contaminated organic matter as fertilizer.	Minimal risk of contamination for human health.
Nutrition	Nutrient delivery	High variability depending on the soil characteristics and structure. Difficult to control the levels of nutrients at the root zone.	Real time control of nutrients and pH to plants at the root zone. Homogeneous and accurate supply of nutrients according to plants’ growth stages. Needs monitoring and expertise.
	Nutrient use efficiency	Fertilizers widely distributed with minimum control of nutrients according to growth stage. Potentially high nutrient loss due to leaching and runoff.	Minimal amount used. Uniform distribution and real time adjustable flow of nutrients. No leaching.
Water use	System efficiency	Very sensitive to soil characteristics, possible water stress in plants, high dispersal of nutrients.	Maximized, all water loss can be avoided. Supply of water can be fully controlled by sensors. No labor costs for watering, but higher investment.
	Salinity	Susceptible to salt build up, depending on soil and water characteristics. Flushing salt out uses large amounts of water.	Depends on soil and water characteristics. Can use saline water, but needs salt flush-out that requires higher volumes of water.
Management	Labor and equipment	Standard, but machines are needed for soil treatment (ploughing) and harvesting which rely on fossil fuels. More manpower needed for operations.	Expertise and daily monitoring using relatively costly equipment are both essential. High initial set-up costs. Simpler handling operations for harvest.