Basic equation fertilizer

  • 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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