Organic gardening in hydroponics – Nutrients reservoir and growing medium management

The organic hydroponics system pre-supposes that the reservoir will not supply nutrients to the plants; thus, there will be no need to constantly check the ppm and pH balance of water. It will make wet only the lower part of the medium and the secondary roots. This system gives a gardener an opportunity to grow plants as easy as it is in soil growing without troublesome balancing of the chemicals and pH level of the water.

The technique of the organic hydroponics allows supplying organic nutrients to the upper soil-mixture layer, as in traditional plants growing. The liquid forms of the organic nutrients are mixed according to the necessary concentration and then poured onto the top of the medium upper half.  Beware, though, of pouring too many nutrients!

This experiment will help you learn how much liquid with hydroponics nutrients you should pour on your plants for its excess not to drip into the lava rock layer and, consequently, into the water reservoir. If you find out that there is an excess of feeding liquid and it drips through the lava rocks into the grow bed, you can either soak it up with a cloth, or you can use other form of fertilizer, the one without liquid. It is also reasonably to change lava rock.

However, if only a small amount of organic nutrients is noticed to drain into the reservoir, there will be no problem, as the volume of water there is much larger. Reservoir water should be changed every 1-2 weeks, similarly to the standard hydroponics nutrients chemical reservoirs

Organic gardening in hydroponics – Ideal growing medium mixture for organic hydroponics gardening

Gardeners experience proves that the mixture of vermiculite, perlite, and organic potting soil (loose 100% organic soil mixture is also suitable) in equal proportions is the best for the successful organic hydroponics gardening. Such mixture offers the perfect upward capillary action of water and supply of CO2 and oxygen. Organic soil in the upper medium layer provokes microbial action.

Some growers practice mixing organic nutrients (e.g. worm castings) into the upper medium part. Others just distribute them on the surface of the grow medium and then spray them with water. Another way is to mix nutrients with half a cup of water and pour onto the top of the medium. Any of these methods ensure proper nutrients entrance into the soil mixture and good absorption by the plants primary roots.

The upper layer of the medium is also called “soil alternative”, as it is the place where the nutrients are supplied to. It is treated as a standard soil container. To improve the capillary action of the water delivered by the lava rock at the bottom, it is recommended to spray the soil alternative once or twice a day with water.

Creating your organic gardening using hydroponics system pay special attention to the level of the pumped water, this must not moisten the upper part of the medium. If this happens, the nutrients, delivered to this soil part of the growing medium, will be washed out into the water reservoir, becoming unavailable for the upper part of the plants root system.

The usual watering cycle takes about half an hour to make the whole upper part of the medium wet. If this time is not enough, you may set the timer to prolong the cycles. It is also possible to spray the upper half of the growing medium with water in addition to the regular pump-triggered watering. Remember that soil-based part should never be soaked in water – being moist is enough for growing organic plants.

Organic gardening in hydroponics – Organic nutrients and growing mediums

The use of organic plant nutrients instead of the man-made chemicals in the hydroponic garden eases the work of a gardener. The matter is that the absence of synthetic chemicals eliminates the problem of ppm amount and pH balance of the water. If there is no need to calibrate nutrients, to check pH level of the water, and calculate fertilizer’s amount, a beginner of the hydroponic gardening will definitely make no mistakes, which means many problems may never occur.

A dual root growing system is made by special composition of the medium in the container: the upper part of the medium is soil or soil substitute, and organic nutrients can be supplied directly to this upper part; the lower half of the medium is some porous material, which retains water, but to which no nutrients are supplied. 

Creating an organic hydroponics system, a gardener may use a standard hydroponic grow container, though a coir fiber container will suit too. The preferred material to put at the bottom of the box is lava rock, which perfectly keeps water. Lava rock is then covered with a thin layer of loose rockwool or coir fiber to divide both medium layers and prevent them from mixing together. The upper half of the container should be filled with a mixture of 1/3 potting soil, 1/3 coarse grade horticulture perlite, and 1/3 large-sized horticulture vermiculite. Such arrangement ensures the upper capillary action of water and protects the bottom of the grow bed from the occasional mixing with any organic particles. 

Using a standard plastic hydroponic grow container one should place a plastic screen lining inside the grow bed, fitting it well at the bottom and on the walls of the container up to their top, also with the aim to protect the water from the small particles in the medium mixture. It is also possible to use a hydroponic container with tiny holes.

One more good choice for the use of organic gardening methods in hydroponics system is coir fiber containers. The filling is the same as described above with the thin layer of loose or strand coir fiber between the two types of medium. 

Such box is then set in the grow bed. Note that the level of the pumped water should be a bit lower than the soil mixture. The secondary root system will be submerged into the water along with lava rock and promote the capillary water flow up into the soil. The lower half of the medium may be watered on a regular hydroponic basis, while the upper one can be moistened just once a day. 

This system allows a gardener to supply nutrients right to the upper part of the medium, where they are vitally important. At the same time, the whole medium structure will be perfectly moistened by the pumped water and the plants will also have constant supply of oxygen and CO2, drawn into their root systems. Finally, proper amount of CO2 will improve the absorption of nutrients by the upper parts of the roots.