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Hydroponic fertilizer

  • Chelated Micronutrients and their Benefits

    Ethylenediaminetetraacetic acid  ( EDTA ), also called  EDTA acid,  is an aminopolycarboxylic acid with the formula [CH2N (CH2CO2H)2]2 . This white, water-insoluble solid is widely used to bind to iron (Fe2+/Fe3+ ) and calcium ions (Ca2+), forming water-soluble complexes even at neutral pH.
     
    It is therefore used to dissolve the Fe- and Ca-containing scale and to release iron ions under conditions where its oxides are insoluble. EDTA is available as several salts, notably  disodium EDTA , sodium calcium edetate, and tetrasodium EDTA, but these all function similarly.
    Chelat Formel 
    Gefahrenzeichen
    Nutrient solutions consist of many mineral elements, most of which are either positively or negatively charged. Some of these mineral elements react with each other (the term is called precipitation: calcium reacts with phosphates and sulfates), which requires separate storage and administration. As a result, these individual compounds are no longer available to the plant. In some cases, even precipitates (A precipitate is a precipitate that forms when a solute separates from a solution.) can be visible and look like a fine white powdery substance that floats in the water or settles at the bottom of the reservoir.
    When the mineral elements precipitate, they become insoluble in water. However, they must be water soluble before they can be used by the plants (i.e., “bound in the nutrient solution”). Hydroponic nutrients consist of both macroelements (nutrients that the plants need in large amounts) and microelements (nutrients that the plants need in small amounts). These microelements tend to combine easily with the other elements, especially under conditions of high pH and/or when there is a high concentration of minerals.
     

    What is a chelated micronutrient?
    The chelation process basically forms a protective shell around the respective mineral element and creates a neutral charge. This keeps them from bonding together and becoming trapped in the nutrient solution. When two molecules of the same type surround a particular mineral, it is called a chelate . However, some chelate molecules are shaped like a letter 'C' and surround the mineral with only one molecule. This type is called a 'complex'. 

     

    Types of Chelates
    The chelate molecules require a bond (a type of glue) to bind them to the desired mineral element. There are a few binding agents that can be used for this, each of which has a different effect on the plants. 

     

    EDTA
    One of the most common forms of chelates is  ethylenediaminetetraacetic acid  (EDTA). Once the elements enter the plant, this very tight bond can become a problem. When absorbed by the plant, the EDTA can form bonds with other mineral elements. EDTA can help solve one mineral deficiency, but in some cases it can cause another. EDTA has even been known to take calcium directly from the cell walls of already formed plant tissue. This causes cellular damage to the plant. In cases where a significant amount of cellular damage has occurred due to calcium loss in this way, the plant cannot maintain enough water pressure ( keyword xylem ), which can make it look as if the plants are dying of thirst (wilting).

     

    Amino Acid Chelates
    Another type of chelate is the amino acid chelate. Amino acid chelates have a slightly less strong bond than EDTA chelates. Once the mineral is absorbed by the plant and released from the amino acid, the plant can use the leftover amino acid as a nitrogen source. Amino acid chelates are also often available for use in organic nutrient formulas and come in both liquid and dry forms.

     

    Glycine Chelates
    Another form of amino acid chelates are the glycine chelates. Just like regular amino acid chelates, once the glycine is separated from the mineral element in the plant tissue, the leftover glycine (amino acid) is used by the plant tissue. The glycine amino acids have an even smaller molecular size, so they are even more easily absorbed by the plants. This makes glycine chelates especially useful in foliar applications, as they pass through the plants leaf pores ( stomata ) more easily than other, larger molecular chelates.

     

    Summary
    Amino acid chelates are very safe for plants for both root uptake and foliar applications and only become toxic to the plant when severely overdosed. In general, however, care should be taken to avoid the toxic effects of EDTA chelates. Many experts advise against using chelated minerals that use sodium as a binding agent altogether. When looking for chelated minerals, it is best to look for ones that do not use sodium. These are readily available to the plants, ones that do not promote other deficiencies (like EDTA chelates), and ones that have organic certification.


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  • Cultivation problems

    The plants are grown before aquaponics or hydroponics. Here are some tips from regular horticulture.

    Cultivating plants is not that difficult. Nevertheless, various mistakes are made, especially for beginners, which is why the cultivation is not satisfactory. Of course, this is bad for your wallet because some types of seeds are quite expensive, and it is also bad for the psyche if the little baby plants do not sprout as previously hoped. Possible consequences are that the desire for your own cultivation is quickly lost and that early young plants (sometimes hybrid varieties) are used.

    So that this does not happen and the motivation for your own cultivation continues to flourish, we would like to show the 5 most common mistakes in cultivation and how they can be avoided with simple means.

     

    Too many nutrients

    Probably the most common mistake in growing is the choice of substrate in which the seeds should germinate. Usually for cost reasons, growing earth is dispensed with here and the commercially available potting soil is used instead. However, this potting soil is pre-fertilized and therefore full of nutrients.

    Neither the seeds nor the small seedlings need this nutrient boost. At this stage, they basically only need two factors: light and water.

    It is also helpful to have a solid but not pressed substrate in which the seedlings can form the first roots. This substrate should be free of nutrients or at least low in nutrients. So at least the commercial breeding earth.

    However, we did even better with Kokoshumus. This coconut is free of nutrients, has a mold-inhibiting effect and stores water much better than potting soil.

     

    Too little or too much water

    Both mistakes are often made – either too little or too much water. Either completely dry or the whole pot or container is under water. An almost constant wet environment is rarely created.

    After trying out several options for growing ( potting soil, growing soil, cotton wool, and much more. ), a method has gradually emerged with a clear lead in terms of yield technology.

    We use or recycle the plastic trays, which contain fresh fruit and vegetables in the supermarket. For example, arugula, spinach, but also strawberries and grapes are usually sold in these bowls. In most households, these bowls end up in the yellow sack, but with us they are collected and reused for cultivation. Advantage: They are available free of charge and they are transparent – so you can regularly check from the side how moist the substrate is.

    About two thirds of the coconut mentioned above is filled into these plastic trays. This Kokushumus stores the water particularly well. Pouring during germination is usually not necessary. Pour on once, plastic film over it, done. A biological microclimate is created inside using the plastic film.

    Critics will of course monetize the amount of plastic and / or coconut used, but from our point of view this variant is still recommended. All three components, both the humus and the bowls and the film, can be used again and again. Of course, this is not the 100 percent perfect and most environmentally friendly variant in the world, but compared to many other environmental sins that happen on this planet every day, this is a variant that can be reconciled with your own conscience.

     

    Too little light

    The third very popular mistake in growing is the lack of light that the freshly germinated plants urgently need. If this light is missing or not sufficiently available, a phenomenon can be observed that is referred to as a distribution.

    When it comes to fermentation, the plant does not grow properly, but forms an extremely long but thin shoot to get to the desired light. In rare exceptional cases, the plant later manages to recover, but usually a healed plant will die after a week or two at the latest.

    So it is extremely important to provide enough light as soon as the first seedlings are visible. We have the best experience with so-called growing lamps. Grow Lights) made over the plastic trays. While this puts a strain on your wallet as an initial investment, the plants will thank you.

    Unfortunately, the growing lamp that we would like to recommend is no longer available for purchase. As soon as we have another recommendation ready, it will be added here.

     

    Too cold

    An environment that is too warm or even hot is also a possible mistake, but rather rare.

    It is much more common that the cultivation takes place in a much too cold environment. With us, cultivation is generally carried out in the house or in a room that has relatively constant temperatures between 20 and 22 ° C. Few plants need it a little warmer or colder.

    If it is desired that the cultivation takes place in the greenhouse, then I recommend thinking about methods to warm the greenhouse and keep the temperatures constant. In Germany, temperatures can still drop below freezing at night in May. Sometimes shining sunshine during the day, but still shivering at night. In any case, it is generally important to wait for the so-called “ Ice Saints ” to put young plants outside.

     

    Sown too tight

    If you have not prepared the young plants individually but plan to spicy them with the appropriate development, you should remember not to make the sowing too narrow. Although it is sometimes a real effort to distribute the small seeds individually, care should still be taken.

    The young plants need space to develop, need light, which they may take away from each other if they sow too closely, and at the latest when they spike, it takes revenge when knotted roots tear off.

    We recommend a distance of at least two centimeters from the respective seed when sowing. Of course, this does not have to be measured exactly with the linear, but if you keep about a thumb width, you are on the safe side. This method can also be used to wonderfully count which seeds are actually germinated and thus calculate the germination rate.


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  • Fertiliser

    1884 Standard Fertilizer Companys Food for Plants

    Fertiliser programmes

    First of all: If you receive a fertiliser recommendation without having explained exactly which plants you are growing, you can safely ignore such recommendations. There are not hundreds of fertiliser types because there is one answer.
     
    Each plant species has individual nutrient requirements that also differ according to the growth phase it is in. Furthermore, indiscriminate fertilising, over-fertilising, under-fertilising, wrong composition etc. can have devastating consequences for many plants, ranging from undersupply to specific plant diseases. In order to achieve the best nutrient mixture for a specific plant, there is no getting around an analysis of the plant itself. For cost reasons alone, we recommend preparing the nutrient composition yourself.
     

     

    Mixing hydroponic fertiliser yourself ?

    The commercially available fertilisers consist of a complete fertiliser supplemented with macronutrients. They are offered by some hydroponics and/or fertiliser companies and vary depending on the hydroponic plant. An example of a fertiliser programme is the hydroponic tomato programme offered by Hydro-Gardens.

    In this programme, growers purchase Hydro-Gardens Chem-Gro tomato formula. It has a composition of 4-18-38 and also contains magnesium and micronutrients. To make a nutrient solution, it is supplemented with calcium nitrate and magnesium sulphate, depending on the variety and/or growth stage of the plant.

     

    Advantages of fertiliser programmes

    Programmes like these are easy to use. Minimal ordering of fertilisers is required (only 3 in the Hydro-Gardens example).
    Very little or no mathematical calculations are required to prepare nutrient solutions.
     

    Disadvantages of fertiliser programmes

    Fertiliser programmes do not allow for easy adjustments of individual nutrients. For example, if the leaf analysis shows that more phosphorus is needed. When using a fertiliser programme exclusively, it is not possible to simply add phosphorus.
    Another disadvantage is that fertiliser programmes do not allow farmers to take into account the nutrients already present in the water source. For example, if a water source has a potassium content of 30 ppm, there is no way to adjust the amount of potassium added in the fertiliser programme. And too much potassium can in turn block the uptake of other nutrients.

     


     

    Fertilizer programs can be more expensive than using
    Recipes for the production of nutrient solutions.

     

    Mix recipes for nutrient solutions / hydroponics fertilizer yourself

    There are also recipes for the production of nutrient solutions. The recipes contain a certain amount of each nutrient to be added to the nutrient solution. They are specifically available for a specific crop and in a variety of sources, e.g. B. at the university advice centers, on the Internet and in specialist journals. One example is the modified Sonovelds solution for herbs (Mattson and Peters, Insidegrower) shown below.
     

     

    Modified Sonneveld recipe / herbs

    element concentration
     Nitrogen 150 ppm 
     Phosphorus  31 ppm
     Potassium  210 ppm
     Calcium 90 ppm 
     Magnesium  24 ppm
     Iron  1 ppm
     Manganese  0.25 ppm
     Zinc  0.13 ppm
     copper 0.023 ppm
     Molybdenum 0.024 ppm
     Boron 0.16 ppm

     

    It is at the discretion of the breeder which fertilizers he uses to produce a nutrient solution according to a recipe. The fertilizers commonly used include:

    fertilizerDosage, contained nutrients
     Calcium nitrate 15.5 – 0 – 0.19% calcium
     Ammonium nitrate 34 – 0 – 0
     Potassium nitrate 13 – 0 – 44
     Sequestrene 330TM 10% iron
     Potassium phosphate monobasic 0 – 52 – 34
     Magnesium sulfate 9.1% magnesium
     Borax (laundry quality) 11% boron
     Sodium molybdate 39% molybdenum
     Zinc sulfate 35.5% zinc
     Copper sulfate 25% copper
     Magnesium sulfate 31% manganese
    Farmers calculate the amount of fertilizer in the
    nutrient solution based on the amount of a nutrient
    in the fertilizer and in amount specified in the recipe.

     

    Advantages of nutrient solution recipes

    Nutritional solutions allow fertilizers to be adjusted based on the nutrients contained in water sources. An example: A gardener uses a water source with 30 ppm potassium and produces the modified Sonneveld solution for herbs that requires 210 ppm potassium. It would have to add 180 ppm potassium ( 210 ppm - 30 ppm = 180 ppm ) to the water in order to obtain the amount of potassium required in this recipe.
    With recipes, nutrients can be easily adjusted. When a leaf analysis report indicates that a plant has iron deficiency. It is easy to add more iron to the nutrient solution.
    Since recipes make it easy to adapt, fertilizers can be used more efficiently than in fertilizer programs. Using recipes can be less expensive than using fertilizer programs.


    Disadvantages of nutrient solution recipes

    It has to be calculated how much fertilizer has to be added to the nutrient solution. (Link to performing calculations). Some people may feel intimidated by the calculations involved. However, the calculations only require uncomplicated mathematical skills based on multiplication and division.
    A high-precision scale is also required for the measurement of micronutrients, since the required quantities are very small. Such a scale can be found on Amazon from 30.- €: e.g .: KUBEI 100g / 0.001g.

     

    This is about the calculation of nutrient solutions for your own needs


    Picture: Boston Public Library is licensed under CC BY 2.0


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  • Hydroponic Solutions

    Laboratory
    Queensland State Archives, Digital Image ID 1857
    Hydroponic solutions are a central component of hydroponic farming, where plants grow in a soilless system and get their nutrients directly from an aqueous solution. These solutions contain all the essential macro and micro nutrients that plants need for growth. The main macronutrients include nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg) and sulfur (S), while the micronutrients include iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), boron (B) and molybdenum (Mo).
     
    A hydroponic solution must be carefully formulated to ensure the optimal ratio of these nutrients to ensure plants grow healthily and produce high yields. The pH of the solution is also crucial and should be in the range of 5.5 to 6.5 to maximize nutrient uptake.
    There are different types of hydroponic systems, such as NFT (Nutrient Film Technique), Deep Water Culture (DWC), and aeroponic systems, all of which rely on the use of hydroponic solutions. The exact composition of the solution can vary depending on the type of plant, growth stage, and specific conditions.
     
    A calculator for hydroponic solutions can be found at HydroBuddy or  HydroCal .
     

    element role Ionic form (s) Low range (ppm) High range (ppm) Common sources comment
    Nitrogen Essential macronutrient
    NO 3 
    or 
    NH 4
    100 1000 KNO 3, NH 4 NO 3, Ca (NO 3) 2, HNO 3, (NH 4) 2 SO 4 and (NH 4) 2 HPO 4 NH 4 interferes with Ca 2+ uptake and can be toxic to plants when used as the primary nitrogen source.A 3:1 ratio of NO - 3-N to NH + 4-N (wt%) is sometimes recommended to balance pH during nitrogen absorption.Plants respond differently depending on the form of nitrogen, e.g. ammonium has a positive charge and thus the plant will eject a proton (H  +  ) for each NH  +  4 taken up, resulting in a reduction in rhizosphere pH.When supplied with NO  -  3 the opposite can occur as the plant releases bicarbonate (HCO  -  3), which increases rhizosphere pH.These changes in pH can affect the availability of other plant essential micronutrients (e.g. Zn, Ca, Mg).
    potassium Essential macronutrient  + 100 400 KNO 3, K 2 SO 4, KCl, KOH, K 2 CO 3, K 2 HPO 4 and K 2 SiO 3 High concentrations impair Fe, Mn and Zn function. Zinc deficiencies are often the most obvious.
    phosphorus Essential macronutrient PO3−4  30 100 K 2 HPO 4, KH 2 PO 4, NH 4 H 2 PO 4, H 3 PO 4 and Ca (H 2 PO 4) 2 Excess NR 3 tends to inhibit PO  3−  4 absorption.The ratio of iron to PO  3−  4 can affect co-precipitation reactions.
    calcium Essential macronutrient Approx  2+ 200 500 Ca(NO3)2, Ca(H2PO4)2, CaSO4, CaCl2 Excess Ca  2+ inhibits Mg  2+ uptake.
    magnesium Essential macronutrient Mg2  + 50 100 MgSO 4 and MgCl 2 Should not exceed the Ca  2+ concentration due to competitive uptake.
    sulfur Essential macronutrient SO  2−  4 50 1000 MgSO 4, K 2 SO 4, CaSO 4, H 2 SO 4, (NH 4) 2 SO 4, ZnSO 4, CuSO 4, FeSO 4 and MnSO 4 Unlike most nutrients, plants can tolerate high concentrations of SO  2−  4 and selectively absorb the nutrient as needed. However, undesirable counterion effects still occur.
    iron Essential micronutrient Fe3  + and Fe2  + 2 5 Fe DTPA, Fe EDTA, iron citrate, iron tartrate, FeCl 3, iron III EDTA and FeSO 4 pH values ​​above 6.5 greatly reduce iron solubility. Chelating agents (e.g. DTPA, citric acid or EDTA) are often added to increase iron solubility over a wider pH range.
    zinc Essential micronutrient Zn2  + 0.05 1 ZnSO4 Excess zinc is highly toxic to plants, but essential for plants in low concentrations.
    copper Essential micronutrient Cu2  + 0.01 1 CuSO4 Plant sensitivity to copper varies widely. 0.1 ppm can be toxic to some plants, while a concentration of up to 0.5 ppm is often considered ideal for many plants.
    manganese Essential micronutrient Mn2  + 0.5 1 MnSO 4 and MnCl 2 Absorption is increased by high PO  3−  4  concentrations.
    boron Essential micronutrient B (OH)  4 0.3 10 H 3 BO 3 and Na 2 B 4 O 7 However, some plants are an essential nutrient and are very sensitive to boron (e.g. citrus trees show toxic effects at 0.5 ppm).
    molybdenum Essential micronutrient Mn  4 0.001 0.05 (NH 4) 6 Mo 7 O 24 and Na 2 MoO 4 A component of the enzyme nitrate reductase, which is required by rhizobia for nitrogen fixation.
    nickel Essential micronutrient Ni2  + 0.057 1.5 NiSO 4 and NiCO 3 Essential for many plants (e.g. legumes and some cereals). Also used in the enzyme urease.
    chlorine Variable micronutrient C1  - 0 Very variable KCl, CaCl 2, MgCl 2 and NaCl May interfere with NO   3 uptake in some plants, but may be beneficial in some plants (e.g. in asparagus at 5 ppm).Absent in conifers, ferns and most bryophytes.
    aluminum Variable micronutrient Al3  + 0 10 Al2(SO4)3 Essential for some plants (e.g. peas, corn, sunflowers and cereals). May be toxic to some plants below 10 ppm. Sometimes used to make flower pigments (e.g. of hydrangeas).
    silicon Variable micronutrient SiO  2−  3 0 140 K 2 SiO 3, Na 2 SiO 3 and H 2 SiO 3 Present in most plants, abundant in cereals, grasses and tree bark.Evidence that SiO  2−  3 improves resistance to plant diseases.
    titanium Variable micronutrient T3  + 0 5 H 4 TiO 4 May be essential, but trace amounts of Ti  3+ are so ubiquitous that its addition is rarely justified. At 5 ppm, beneficial growth effects are notable in some crops (e.g. pineapple and peas).
    cobalt Non-essential micronutrient CO2  + 0 0.1 CoSO4 Required for rhizobia, important for nodulation of legumes.
    sodium Non-essential micronutrient Well  + 0 Very variable Na 2 SiO 3, Na 2 SO 4, NaCl, NaHCO 3 and NaOH Na  + can partially replace K  + in some plant functions, but K  + is still an essential nutrient.
    Vanadium Non-essential micronutrient VO2  + 0 Trace, undetermined VOSO4 Beneficial for rhizobial N 2 fixation.
    lithium Non-essential micronutrient Li  + 0 Undetermined Li 2 SO 4, LiCl and LiOH Li  + can increase the chlorophyll content of some plants (e.g. potato and pepper plants).
     
     

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  • Nutrient solution: The simplest Solution

    Here is a recipe for small systems that supply tomatoes, peppers and leafy vegetables:
     
    Ingredients
    Base with micronutrients/trace elements: Masterblend 4-18-38 Hydroponic Fertilizer: this is still missing magnesium sulfate and calcium nitrate.
    One kilo costs about 30 to 49 euros and is enough for about 1500 liters of nutrient solution
     
    Magnesium sulfate: Epsom Salt
    One kilo costs about 5 euros 
     
    Calcium nitrate: PowerGrow Calzium Nitrate 15.5-0-0
    One kilo costs about 24 euros 

    Recipe
    Mix the ingredients in the following ratios: (2:1:3). You must not mix all the ingredients together .
    To do this, take two containers (bottles) of 500 ml each. This will prevent the calcium nitrate from reacting with the phosphate and precipitating.
     
    Fill the first bottle with 120 grams of NPK fertilizer and 60 grams of magnesium sulfate. If you use warm water (preferably deionized or distilled), the components dissolve better. Remember that tap water already contains calcium and magnesium. Depending on the water hardness, you should reduce the amount of calcium and magnesium. One °dH corresponds to 10 mg CaO (calcium oxide) per liter of water.
     
    Contents  division
     120 grams of Masterblend 4-18-38 (about 1/2 cup and a tablespoon) 
     60 grams of magnesium sulfate (about 4 tablespoons)
     Solution 1: mix with 500 ml water
     180 grams of calcium nitrate (about 3/4 cup)  Solution 2: mix with 500 ml water
     
     
    Use / Concentration
     Plant  concentration 
     Fruit-bearing bedding plants
     Solution 1: 3 ml per liter of water: for 10 liters take 30 ml, for 1 gallon = 12 ml
     Solution 2: 3 ml per liter of water: for 10 liters take 30 ml, for 1 gallon = 12 ml
     Green leafy vegetables  Solution 1: 2.5 ml per liter of water: for 10 liters take 25 ml, for 1 gallon = 8 ml
     Solution 2: 2.5 ml per liter of water: for 10 liters take 25 ml, for 1 gallon = 8 ml
     
    When mixing the nutrients, pay attention to whether the plants show any signs of deficiency. Read more here: Signs of deficiency.
    If you have an EC or TDS meter, the concentration should be between 1.5 and 2.0 EC. Read more here: EC and pH values ​​of plants.
     

    * ) Conversion
    1 US gallon = 3.78541 liters = 231 cubic inches (inch³)
    1 liter = 0.26417 US gallons
    1 American gallon = 4 American quarts = 8 American pints = 3.785411784 liters
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