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Fertigation
    Home Blog Agronomy Fertigation

    Fertigation

    By Tanja Folnović | Agronomy, Blog Comments are Closed | 30 June, 2015 | 0

    The practice of supplying crops in the field with fertilizers via the irrigation water is called fertigation. Fertigation – a modern agro-technique, provides an excellent opportunity to maximize yield and minimize environmental pollution by increasing fertilizer use efficiency, minimizing fertilizer application and increasing return on the fertilizer invested. In fertigation, timing, amounts and concentration of fertilizers applied are easily controlled.

    A large range of fertilizers, both solid and liquid, are suitable for fertigation depending on the physicochemical properties of the fertilizer solution. For large scale field operations, solid fertilizer sources are typically a less expensive alternative to the commonly used liquid formulations. The solubility of these fertilizers does vary greatly. When switching to a solid fertilizer source, problems can be avoided in the nurse tanks by ensuring that ample water is added to the stock solution.

    In selecting fertilizers for fertigation four main factors should be considered:

    • Plant type and stage of growth
    • Soil conditions
    • Water quality
    • Fertilizer availability and price.

    The type of fertilizer for fertigation should be of high quality, with high solubility and purity, containing low salt levels, with an acceptable pH and it must fit in the farm management program.

    Advantages of fertigation

      • Nutrients and water are supplied near the active root zone through fertigation which results in greater absorption by the crops
      • As water and fertilizer are supplied evenly to all the crops through fertigation there is possibility for getting 25-50 per cent higher yield
    CropsWater Saving (%)Yield (t/ha)
    ConventionalDripDrip+Fertgn
    Banana35263037
    Sugarcane29120160207
    Tomato32455665

    Examples of different crops of water saving, yield and profit under drip and drip + fertigation systems

    • Fertilizer use efficiency through fertigation ranges between 80-90 per cent, which helps to save a minimum of 25 percent of nutrients
      NutrientFertilizer use efficiency (%)
      Soil applicationFertigation
      Nitrogen30-5095
      Phosphorous2045
      Potassium5080

      Fertilizer efficiencies of various application methods

    • By this way, along with less amount of water and saving of fertilizer, time, labor and energy use is also reduced substantially

    Fertilizers used in fertigation

    For applying through fertigation Urea, potash and highly water soluble fertilizers are available. Urea is well suited for injection in micro irrigation system. It is highly soluble and dissolves in non-ionic form, so that it does not react with other substances in the water. Urea also does not cause precipitation problems. Application of super phosphorus through fertigation must be avoided, as it makes precipitation of phosphate salts. Thus phosphoric acid is more suitable for fertigation as it is available in liquid form.

    Special fertilizers like mono ammonium phosphate (nitrogen and phosphorus), Poly feed (nitrogen, phosphorus and potassium), Multi K (Nitrogen and Potassium), Potassium sulphate (potassium and sulphur) are highly suitable for fertigation, as they are highly soluble in water.  Along with special fertilisers, Fe, Mn, Zn, Cu, B, Mo are also supplied.

    NameN – P2O5 – K2O contentSolubility (g/l) at 20 C
    Ammonium nitrate34-0-01830
    Ammonium sulphate21-0-0760
    Urea46-0-01100
    Monoammonium phosphate12-61-0282
    Diammonium phosphate18-46-0575
    Potassium chloride0-0-60347
    Potassium nitrate13-0-44316
    Potassium sulphate0-0-50110
    Monopotassium phosphate0-52-34230
    Phosphoric acid0-52-0457

    Fertilizers commonly used in fertigation

    The shortage of water worldwide for use in agriculture and increased urbanization has forced agricultural development to new locations, less suitable to old flood or canal irrigation methods, which lead to the development of fertigation. It was first developed for field and horticultural crops, and later used on tree plantations. In later stages, small gardens and the potting trade adopted the use of fertigation with automatic scheduling of irrigation cycle for home and city gardens.

    Fertigation today is used in any system, small or large scale, all over the world.

    In fertigation it’s also important to track activities on all fields and crop productions or farms. Every time you irrigate, fertilize or even protect your crops, you can enter this data into AGRIVI and track spent amounts of water, fertilizers and pesticides per field. All that can be viewed and analyzed on daily basis.

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    Tanja Folnović

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