To get more information on the technical aspect of Hydroponics please read "SOILLESSDear Readers,
As hydroponics is soil-free mode of farming then how do the plants store the nutrients and moisture in it which is must for the growth?
CULTURE"-Theory & Practice by Michael Raviv & J,Heinrich Lieth.
As told by -
Dr Vidur Sahgal
Very simply, plants absorb food through their roots, and transform it into organic matter through their leaves. Soil is the result of the mechanical alteration of rock and the chemical activity of organic transformations. It acts as a support for plants, it provides the water, oxygen, and mineral salts they need to develop. On a strictly nutritional level, soil acts as a substrate whereas water transports the nutrients. Soil retains water with more or less efficiency, depending on its water retention capacity. At root level, you find small absorptive hairs that firmly stick to the soil particles. These hairs create a vast interaction area between the soil and the plant and enhance water absorption capability of the root surface. This is the reason, especially during transplanting; one has to be careful not to damage these small rootlets. This absorption action, under the influence of “osmotic pressure”, will transport the nutrients from the soil to the leaves.
Hydroponics is a technology for growing plants in nutrient solutions (water and fertilizers) with or without the use of artificial medium (e.g., sand, gravel, vermiculite, rockwool, peat, coir, sawdust) to provide mechanical support. Liquid hydroponic systems have no other supporting medium for the plant roots: aggregate systems have a solid medium of support. The inert growing medium does not contain any nutrients. Hydroponic systems are further categorized as open, where after the nutrient solution has been delivered to the plant roots, it is not reused; or closed where surplus solution is recovered, replenished, and recycled. In hydroponics, plants roots will only take up as much nutrition as they require. However, mixing a solution too high in nutrient levels will result in root dehydration. All plants require a balance of nitrogen, phosphorous and potassium (N-P-K) and trace elements to grow properly. The growth influencing factors determine a plants' ability of utilize these nutrients adequately. Small amounts of these nutrients can be assimilated through healthy soil; however, they are quickly depleted rendering the soil void of all life sustaining properties.
Hydroponic formulations are structured for the different stages of growth. In hydroponic cultivation, essential nutrients are provided in ideal proportions. A plant's nutritional requirements shift from their vegetative stage to their flowering stage. Natural enzymes, vitamins and some rare trace elements will stimulate normal biological functions in plants. There are other nutrients designed to help facilitate faster nutrient uptake and accelerate stem and leaf growth.
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